IW5EDI Simone - Ham-Radio

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Kenwood TS-850S Mods

Posted: 07 May 2020 10:30 AM PDT
http://www.iw5edi.com/ham-radio/4411...d-ts-850s-mods



As posted to the CQ Contest e-mail reflector




Subject: TS-850 contest mods (long)
Date: 4 Jun 1997
From: David O Hachadorian, K6LL
Organization: cq-contest Mailing List [CQ-Contest]





There was a huge number of requests for the TS-850 mods,
so Ill just post them here.



Mod for External Keying, While Using the Internal Keyer by N7EX
Front Panel CW Sidetone Level Adjustment Mod by N6TR
Separate Receive Antenna Modification #1 by WA3WJD
Separate Receive Antenna Input Mod #2 by N6TR
PROJECT #2: The switch box by N6TR
PC Interface, without using the IF-232 Level Converter by N6TR
Power Output Control by the unknown contester
Level Attenuator for DRU-2 playback audio by K6LL








KENWOOD TS-850:




MODIFICATION FOR EXTERNAL KEYING,
WHILE USING THE INTERNAL KEYER
BY: N7EX (ex-N0DH), Dave Henderson




One of the minor draw backs to the TS-850 as a CW contest machine is the
inability to use the internal keyer in conjunction with an external keying
circuit such as a personal computer or auxiliary memory keyer. As designed
you must manually throw a switch from internal to external keying to switch
between one or the other. To make matters even more inconvenient this
switch is on the back of the unit and is not readily accessible during
normal operation.




Simply said this modification involves running a new keying line from the
junction of S1 and D51 on the IF Board. For convenience this additional
keying line can be wired to the DSP1 and/or DSP2 RCA phono jacks if you do
not use the external DSP unit.









The modification to the unit to resolve this problem takes less than 30
minutes to accomplish and can be done without permanently modifying the
unit which would detract from its future resale value. If you dont use the
external DSP unit then the two RCA phono jacks marked DSP1 and DSP2 can be
used as additional keying input jacks as will be outlined below. If you use
the external DSP unit then the modification can still be accomplished by
running the external keying line out on a pigtail. I highly recommend the
purchase of a service manual which will greatly improve your ability to
indentify the circuit points involved in the modification. Considering that
the radio costs $1500 whats another $30 to keep from messing it up! By the
way compared to the two TS-930s that I nursed through the 80s, this radio
is a breeze to trouble shoot and repair which I have had to do twice
through no fault of Kenwood (long stupid story ~8).




From here you proceed at your own risk, if you fry the radio DONT CALL ME.
A precision low wattage solder pencil for doing surface mount soldering is
recommended, If all you have is a 150 watt Weller solder gun then read no
farther your better off taking the unit to an expert rather than melt the
circuit traces.




I assume no risk for the accuracy or completeness of the enclosed
information. All yee who enter here embrace all hope for you may likely
have a better contest radio when you are done.

1) Turn the unit upside down with the back of the TS-850 toward you.

2) Remove the bottom cover.

3) In this position the IF board is on your left.

4) Remove all the screws holding the IF board to the chassis.
(put them in a jar or something for safe keeping).

5) Unplug enough of the cabling to allow you to tilt the board up so that
you can access the bottom side of the board underneath S1 the
External/Internal keying switch.

6) On the bottom side of the board directly underneath S1 you will see 6
solder pads arranged in two rows of three pads each.

7) The middle pad on S1 nearest the back of the radio should be GROUND,
solder the braid of an approximately 9 inch piece of small audio style
shielded cable to this point, being careful to dress the coax so as not to
short to other circuitry.

8) The middle pad on S1 in the next row up of three pads is the keying
line. Solder the center of the shielded cable to this point.

9) Route the other end of the shielded audio cable through the chassis in
the vicinity of the DSP jacks above.

10) Carefully inspect all solder joints for shorts, etc. Replug the wire
harnesses unplugged in step 5 above and reassemble the board to housing.
Reassemble the bottom cover.

11) Turn the unit over and remove the top cover.

12) Find the DSP input board with the three RCA phono jacks on it at the
rear of the unit. The two DSP jacks are on the right when facing the rear
of the unit. There are two connectors on this board (a 2pin and a 4pin).
Unplug the 4 pin connector. Obtain another 4 pin connector and connect as
follows (or directly solder to the underside of the board as follows) If
you only need one additional CW jack then ground is pin 2 (closer to center
of the radio)connect the braid of your new key line to this pin. The input
from the middle RCA phono plug is pin 1 connect the ceneter conductor to
this pin. Like wise if you want two additional CW jacks then do as above
plus add a short between pins 1 and 3. If you want a small RF choke or some
ferrite beads on the center conductor of the audio cable may prevent keying
problems in high RF field environments

14) Close the unit up and switch S1 to INTERNAL keying. You should now be
able to key the unit via the internal keyer (Via the standard key input
jack) or with an external keyer or computer via the old DSP jacks, without
having to switch S1.








TS-850 front panel CW sidetone level adjustment, mod by N6TR.
Refer to NCJ, Vol 22, Issue 2, Page 23.








TS-850 Separate Receive Antenna Modification #1.
This modification was developed by Brian, WA3WJD




Make a short loop of white telfon cable with a male and female BNC
connector.

Loop it out of the back of the rig so just enough of the coax sticks out so
the BNCs can be joined with a barrel connector.

Locate the little header connector on the filter board in the TS-850 that
is on the receiver side of the TS850 antenna relay. Pull that connector
loose.

Spend a little time tracking down male and female header connectors that
match what Kenwood uses. Install those on the ends of the white teflon
coaxes sticking in the back of the radio.

For normal use, just connect the BNCs with a barrel connector and the rig
is normal. For Beverage use, connect an extra antenna switch common and ant
#1 to the BNC connectors, and put ur Beverages on the other positions.








TS-850 Separate RX antenna input mod #2.
This mod was developed by N6TR.




This is near the top of everyones list when they are asked What things bug
you about the TS-850S. I initially overcame this deficiency by modifying my
amplifier so I could connect a different receive antenna to the TR relay.
However, I wanted to change things so there wasnt as much RF getting into
the RX antenna due to close proximity to the amplifiers output. This became
a problem when using the same receive antenna on a second radio (you knew
two radio contest operating was going to work its way in here somehow).









Ville, OH2MM had provided me with instruction on how he modified his
TS-850S to have a separate RX input and this inspired me to try it.
Here are some simple steps to hopefully inspire others:

It took me an unrushed two hours to do all this.

1. Remove the top panel (you dont need to take off the bottom one).

2. Remove the plate which sits between the fan and the back of the radio.
This covers the output filter PC board.

3. Unsolder the connections to the SO-239 output connector.

4. Remove the three cables from the PC board next to the SO-239. This
includes two coax and one 3 conductor harness.

5. Remove the two screws holding in the PC board and remove it.

6. Locate the trace that goes from the relays normally closed contact. You
can use an ohm-meter to find it probe from the wire that went to the
SO-239. You will find a short trace on the back of the board which runs to
a chip capacitor. Cut this trace and solder some very small coax to each
side of the cut connect ground to the nearby ground trace.

Make the cables about 4 inches long.

7. Remove the antenna tuner. There are 2 screws in the back and front (you
will need a magnetic screw-driver) and one on the side. You will need to
carefully unplug two wire harnesses and one coax connector.

8. Drill two holes for phono jacks on the back of the radio. Be careful not
to obstruct the screw hole for one of the screws in the back of the antenna
tuner. The best place is between the RF output connector and the
groundpost. Put them on top of each other and as close to the bump on the
back panel as possible. I used a vacuum cleaner while drilling to make sure
no metal chips went anywhere.

9. You will find a small hole under the SO-239 where you can feed the two
coaxs through. Solder them to the phono jacks and reassemble everything. I
put back to back diodes on the RX antennas input, but you may not want to
do this. A better thing would be to add a relay to disconnect the RX
antenna input when transmitting. I took care of that in project #2.

10. Obviously, you will need a jumper cable to make your receiver work
again.









PROJECT #2 The switch box:





4 position rotary switchDPDT 12 VDC relay1 K Ohm pot (optional)12 phono
jacks (or you can get by with 9)mini box for above and knobs.Clamp diode
for relay coil if not included in relay




This box does two things: disconnects the receive antenna input when
transmitting and allows selection of the transmitting antenna or one of
three RX antennas when receiving. The pot can be used for RF attenuation if
your rig doesnt have one.




The relay gets controlled by the PTT output from your rig that normally
would go to your amplifier. Then one set of the contacts is used to key
your amplifier. Dont forget to put a diode across the coil of your relay if
there isnt one internally. Otherwise, you will have undesired arcing across
the contacts of the relay in your radio.









The other set of contacts disconnect the output of the rotary swtich when
transmitting. The rotary switch selects either the signal coming from the
transmitting antenna (from the TR relay in your rig) or one of three
receiving antennas. I use two phono jacks per RX antenna so I can feed them
to other boxes for other radios. I also use two jacks for +12 volts so I
can jumper power to another box.




You can build up one of these boxes in an hour or two. You can epoxy the
relay to the mini box.






If you want the pot there to act as an attenuator, I just hook it up like
you would a volume control: one end is ground, the other end goes to the
output of the rotary switch and the wiper goes to the output. Use shielded
cable as much as possible to avoid stray pickup.








Computer Interface for the TS-850, without using the IF-232 Level Converter.
Mod developed by N6TR, and possibly others, with zener idea added by K6LL.
Note: This interface will work with TR, contest logging software by N6TR.





Computer Interface:

470 ohms
DB9 PIN 3 (TXD) ----////------------ TS850 ACC 1 PIN 3 (RXD)
(DB25 PIN 2) |
|
|
---- 5 VOLT ZENER DIODE
/
/
|
|
DB9 PIN 5 (GND) ------------------------ TS850 ACC 1 PIN 1 (GND)
(DB25 PIN 7)

DB9 PIN 2 (RXD) ------------------------ TS850 ACC 1 PIN 2 (TXD)
(DB25 PIN 3)

----- TS850 ACC 1 PIN 4 (CTS)
|
|
|
----- TS850 ACC 1 PIN 5 (RTS)









TS-850 Power Output Control
VR7 on the RF Board (bottom side of radio). 125 watts or so on cw is safe.
Do not exceed
100 watts on SSB, since distortion will broaden the transmitted signal.








TS-850 Level Attenuator for DRU-2 playback audio. Mod by K6LL.





1. Remove the little hatch on the top of the radio.
2. With the front of the radio facing you, find connector CN505. It is a
five pin connector near the filter DIP switches. The white wire on the
leftmost terminal carries the DRU audio output.
3. Cut the white wire and insert a 100K ohm micromini pot, shunted with a
220 pf capacitor. Adjust the pot until DRU playback level matches live
microphone level.




Dave Hachadorian, K6LL

The post Kenwood TS-850S Mods appeared first on IW5EDI Simone - Ham-Radio.


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The CobWebb Antenna

Posted: 07 May 2020 10:27 AM PDT
http://www.iw5edi.com/ham-radio/4407...obwebb-antenna



he G3TPW Cobwebb antenna covers five bands, 14 28 mhz, including the WARC
bands. It is made by SRW Commuications Ltd (Steve Webb), Astrid House,
Swinton, Malton, N. Yorkshire YO17 0SY (tel: 01653 697513).




It is strongly made using fibre glass rods and comes pretuned, but is
easily adjusted to ones own frequency of preferrence if required.




It consists of five nested dipole balun fed and mounted horizontally.
Rotation is not required. Fed with 50 ohm coax. Can be used indoors in a
loft as it only measures eight feet across and is very light to handle.








Particularly recommended for those with restricted space.




Source g3ycc

The post The CobWebb Antenna appeared first on IW5EDI Simone - Ham-Radio.


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Single Coax Feed to Multi-Band Copper Cactus Antenna

Posted: 07 May 2020 10:25 AM PDT
http://www.iw5edi.com/ham-radio/4405...cactus-antenna



There are three connection possibilities to feed the multi-band copper
cactus antenna with a single feedline or coax.




However, it is imperative that you use the proper coax for the highest band
of operation, RG58 just wont cut it and even RG8 in lengths longer than 25
feet is marginal in 440 operation.




For all single coax feeding methods, the antenna will require re-tuning to
obtain the lowest SWR for each band. This is accomplished by installing in
the pipe cap of the tuning stub on each band of operation a brass machine
screw of at least 2 inches in length vertical out of the cap.




The first and simplest connection method, albeit the hardest to tune,
requires that you place a shorting wire on all but the lowest band of
operation. If you are building your antenna from the N0ZOI (now KG0ZP)
plans for The Copper Cactus Antenna and for example building a tri-bander
for the frequencies of 144, 220 & 440 MHz, the shorting wires should be
placed between the normal connect points for the shield and center
conductor of each band. The 440 band shorting wire should be placed exactly
1 inch above the top of the horizontal pipe of the 440 tuning stub, the 220
band shorting wire should be placed exactly 1-1/2 inches above the
horizontal pipe of the 220 tuning stub and your coax suitable for 440
operation should be connected exactly 2-1/4 inches above the horizontal
pipe of the 144 tuning stub with the center of the coax going to the main
vertical and the shield to the tuning stub (this is just the reverse of the
connections shown on the plans and in the methods below), keeping the
center conductor length as short as possible.





For best results, tune the antenna from the highest band to the lowest,
however, using the shorting method does create quite a bit of interaction.




The second method is easier to tune than the first method, but does require
placing 1/4 or 1/2 wavelength matching sections for all the bands of
operation. If you are building a dual band antenna, the use of a
T-Connector simplifies the project. Please bear in mind that you cannot use
a 1/4 wavelength matching section on one band and a 1/2 wavelength matching
section on another band, plus each band of operation requires the use of a
matching section, including your lowest band of operation. Unfortunately,
the connections will be inside the vertical section, a feat not easy to
accomplish, but it does make tune-up much faster and easier than the
shorting strap method shown above. The center connector of the coax
matching sections is affixed to the tuning stub and the shield to the
vertical section, keeping the center conductor length lead as short as
possible.









The third method requires no antenna re-tuning from the specifications
given on the plans and random length pieces of coax may be used. However, a
relay switching assembly must be constructed inside a weathertight
enclosure or the use of a duplexer for dual-band operation or tri-plexer
for tri-band operation can be utilized. As above, the center conductor of
the coax goes to the tuning stub and the shield to the vertical.




I will note that I have used random length coax, without *-plexers or relay
assemblies, however, this method worked on only three of five duplicate
antennas using the same random length pieces of coax on each. Each band
showed an SWR of less than 1.025 to 1 until connected together, then two of
the antennas showed an SWR of over 3 to 1 and three antennas were less than
1.8 to 1 across all bands without re-tuning. A little re-tuning brought the
SWR down to below 1.2 to 1 on two of the antennas, but we could not acheive
anything lower than the original 1.8 to 1 on the third. So if you use
random length coax and no relays or *-plexers, good luck.




NOTE: The connect distance above the horizontal member on each band is
selected for an impedance of around 50 ohms, moving the connect point up or
down from this set point can and will increase the impedance as high as 650
ohms within a distance of 1/2 inch either side of the established proper
connect point.




Article posted by KGØZP

The post Single Coax Feed to Multi-Band Copper Cactus Antenna appeared
first on IW5EDI Simone - Ham-Radio.


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PC-HFDL

Posted: 07 May 2020 10:21 AM PDT
http://www.iw5edi.com/ham-radio/4403/pc-hfdl



Even if outdated (2002) and unsupported this freeware acars program promise
to do the job.




HFDL is a HF data link protocol, defined in ARINC spec 635-3




Developed byÂ* Charles Brain.









Donwload PC-HFDL

The post PC-HFDL appeared first on IW5EDI Simone - Ham-Radio.


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Super Morse for MSDOS

Posted: 07 May 2020 10:19 AM PDT
http://www.iw5edi.com/ham-radio/4401...orse-for-msdos



Super Morse is the original comprehensive Morse Code training program for
the PC. Super Morse permits the user to learn the Morse characters in a
very orderly way using several different methods, including one unique to
Super Morse; build speed with special exercises; enhance existing operating
skills with even advanced exercises; measure progress with a testing
feature; and even operate via radio or telephone modem. Super Morse permits
the user to change speeds and other parameters on the fly, use standard
spacing or Farnsworth methods, and insert interference to simulate an
actual radio contact.




The author is Lee Murrah, KY8T (ex WD5CID), 169 Bassett Pl., Bloomfield, MI
48301.




Download Super Morse (192 Kb)



Frequently Asked Questions




1. Is Super Morse available for Windows?




No. Super Morse is a DOS program, but it will usually run under Windows as
a DOS application using the SM.PIF file and the loop timing method. In
Windows 95 you will need to restart Windows in the DOS mode. Running in a
DOS window or running from the DOS prompt may not work.




2. Is there a version of Super Morse for the Macintosh?




No. However, some users have reported that they are able to run Super Morse
on the Macintosh with an emulator, although that will not work with
versions 3.10 through 3.16 due to the timing method used. I have no plans
to port Super Morse to other machines.




3. Can I send the code sounds through a sound card?




Yes, you can use the Sound Blaster card if you have the right version.
Versions through 3.16 do not support the Sound Blaster card, but 4.01 and
later do. Super Morse is unable to use the Sound Blaster when running in
Windows if the Sound Blaster is set up as the Windows sound output device.




4. Where can I obtain the latest version of Super Morse?




Obviously you can download it from this Web page. The latest version of
Super Morse is also always available on Compuserve HAMNET or at the
Internet ftp sites ftp://qrz.com and ftp://ucsd.edu.




5. Do you have any circuits for interfacing Super Morse to my radio?




No, I have no circuits other than those shown in the DOC file.




6. Why cant I just send you some money and have you send me a copy of Super
Morse?




Publishing Super Morse is a hobby, and I have chosen not to make a business
out of it. Therefore, I do not take orders.




7. Do you accept credit cards for the contribution?




No, but you can make a contribution via Compuserve by entering GO SWREG and
selecting program number 649.




8. Is there a printed manual?




No. The manual is distributed in QUICK.DOC and ADVANCE.DOC which are ASCII
files with page numbers and table of contents that can be easily printed on
your printer.




9. Do you notify users of updates?




No. Unlike many other authors, I do not notify contributors when a new
version is releasedI just do not have the time. Watch this Web page.




10. What is your shareware fee?




I do not have a shareware fee per se. However, I do accept contributions to
support development of the program. I suggest a donation of $20. Please do
not send non-U. S. currency due to the high cost of currency exchange in
Iowa. Instead send a postal money order denominated in Dollars.




10. Where do I send a contribution?




M. Lee Murrah
169 Bassett Pl.
Bloomfield, MI 48301

The post Super Morse for MSDOS appeared first on IW5EDI Simone - Ham-Radio.


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The Optimized Wideband Antenna

Posted: 07 May 2020 10:13 AM PDT
http://www.iw5edi.com/ham-radio/4397...deband-antenna



Yagis for 20m 10m by Nathan A. Miller NW3Z







nw3z-Antenna-DesignsDownload

The post The Optimized Wideband Antenna appeared first on IW5EDI Simone -
Ham-Radio.


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The G5RV Antenna

Posted: 07 May 2020 10:08 AM PDT
http://www.iw5edi.com/ham-radio/4394/the-g5rv-antenna



THE G5RV ANTENNA








The G5RV is a very popular antenna on the HF amateur band today. Despite
its widespread use on the bands, there are some myths and misconceptions
concerning the G5RV that seem to have a life of their own. Working with
text from the ARRL Antenna Compendium, Volume 1, I would like to shed some
light on this versatile antenna.




First, from Louis Varney, G5RV, of West Sussex, UK, here is some back-
ground and insights into the G5RV. The G5RV antenna, with its special
feeder arrangement, is a multiband center-fed antenna capable of efficient
operation on all HF bands from 3.5 to 28 MHz. Its dimensions are
specifically designed so it can be installed in areas of limited space, but
which can accommodate a resonably straight run of 102 ft for the flat-top.




Louis further states that, In contradistinction to multiband antennas in
general, the full-sized G5RV antenna was NOT designed as a half-wave dipole
on the lowest frequency of operation, but as a 3/2-wave center-fed
long-wire antenna on 14 MHz, where the 34 ft open-wire matching section
functions as a 1:1 impedance transformer. This enables the 75-ohm
twin-lead, or 50/80-ohm coaxial cable feeder, to see a close impedance
match on that band with a consequently low SWR on the feeder. However, on
all the other HF bands, the function of this section is to act as a make-up
section to accommodate that part of the standing wave (current and voltage
components) which, on certain operating frequencies, cannot be completely
accommodated on the flat- top (or inverted-V) radiating portion.




The design center frequency of the full-size version is 14.150 MHz, and the
dimension of 102 ft is derived from the formula for long-wire antennas
which is:




LENGTH (ft) = 492(n-.05)/f(MHz)




= (492 x 2.95)/14.15




= 102.57 ft (31.27 m)




where n = the number of half wavelengths of the wire (flat-top)




Because the whole system will be brought to resonance by the use of a
matching network in practice, the antenna is cut to 102 ft.




As the antenna does not make use of traps or ferrite beads, the dipole
portion becomes progressivily longer in electrical length with increasing
frequency.




This effect confers certain advantages over a trap or ferrite-bead loaded
dipole because, with increasing electrical length, the major lobes of the
vertical component of the polar diagram tend to be lowered as the operating
frequency is increased.




Thus, from 14 MHz up, most of the energy radiated in the vertical plane is
at angles suitable for working DX.




Furtermore, the polar diagram changes with increasing frequency from a
typical half-wave dipole pattern at 3.5 MHz and a two half-wave in-phase
pattern at 7 and 10 MHz to that of a long-wire pattern at 14, 18, 21, 24
and 28 MHz.




Although the impedance match for 75-ohm twin-lead or 80-ohm coaxial cable
at the base of the matching section is good on 14 MHz, and even the use of
50-ohm coaxial cable results in only about a 1.8:1 SWR on this band, the
use of a suitable matching network is nessessary on all the other HF bands.
This is because the antenna plus the matching section will present a
REACTIVE load to the feeder on those bands.




Page 2 Thus, the use of the correct type of matching network is essential
in order to ensure the maximum transfer of power to the antenna from a
typical transceiver having a 50-ohm coaxial (unbalanced) output. this means
unbalanced input to balanced output if twin-lead feed is used, or
unbalanced to unbalanced if coaxial feeder is used.




A matching network is also employed to satisfy the stringent load
conditions demanded by such modern equipment that has an automatic level
control system. The system senses the SWR condition present at the solid
state transmitter output stage to protect it from damage, which could be
caused by a reactive load having an SWR of more than 2:1.




In Part 2, I will discuss the theoretical operation of the G5RV antenna
band-by-bandKeith, KE2DI

The post The G5RV Antenna appeared first on IW5EDI Simone - Ham-Radio.


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Single band copper pipe "J Antenna

Posted: 07 May 2020 08:37 AM PDT
http://www.iw5edi.com/ham-radio/4390...pipe-j-antenna



N6JSX monoband J pole antenna dimensions







Copper-Pipe-J-AntDownload

The post Single band copper pipe J Antenna appeared first on IW5EDI Simone
- Ham-Radio.


///////////////////////////////////////////
A $50 Beverage

Posted: 07 May 2020 08:34 AM PDT
http://www.iw5edi.com/ham-radio/4388/a-50-beverage



by Randall Thompson, K5ZD




Originally printed in the YCCC Scuttlebutt #119, October, 1995




I built my first Beverage this past year. It was so easy I cant believe I
lived without one. Heres how to do it:



Go to Home Depot (or other large hardware store) and buy a 500 ft roll #16
THHN or MTW wire. Its available in every color you can imagine for about
$15 per 500/ft roll.Go to local feed store and get some electric fence
insulators. This cost me about $3.Call your favorite radio dealer and order
an ICE Beverage matching box. Cost: about $40.Go to Radio Shack and get a
400-600 ohm resistor. I actually used four (4) 2K-Ohm, 2-Watt resistors in
parallel!Roll out the wire in the desired direction. Mount the fence
insulators to convenient trees (my Beverage is not perfectly straight)
about 7-9 feet up. Connect one end of the wire to ground through the
resistor. Connect the other end to the matching box. Connect coax. Enjoy!




I did follow the conventional wisdom of sloping the ends down. I used 4
foot ground rods at each end. I only have room for a 500 foot run. W3LPL
has pointed out that 580 might be a better length. It’s simple to solder
some more wire on.




This antenna makes 80 and 160 enjoyable. Less than $50 to hear Europeans
all summer on the LF bands seems like a good deal if you have the space!




When the antenna broke this summer, I used a split bolt connector to join
the two pieces back together. You can find these for about $1 in the
electrical aisle of the Home Depot (or hardware store). No solder required!









Note 2: You can also order an ICE matching-transformer from:
Industrial Communication Engineers, LTD.
Indianapois, IN
Website:Industrial Communication Engineers, LTD.





About 1/2 the way down the above ICE webpage, youll see that ICE offers
their Model 180A matching box for $39 (plus shipping).
The 180A has taps to select 50 or 75-Ohm coax feedlines, and taps to match
300/450/600 or 800-Ohm Beverage antenna loads.
The 180A also has dc blocking capacitors, and a gas-discharge lightning
protection system.

The post A $50 Beverage appeared first on IW5EDI Simone - Ham-Radio.


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The Lattin 5 band Antenna

Posted: 07 May 2020 08:32 AM PDT
http://www.iw5edi.com/ham-radio/4385...5-band-antenna



The antenna was named for W4JRW who invented it and holds a patent on the
basic principle and uses quarter wave stubs, which act as insulators at the
frequency for which they are cut.








For example, the 611 stub (quarter wave times the velocity factor 0.8 of
the feed line used) blocks RF for 28 mhz from reaching the rest of the
antenna.




In the example shown in the diagram, tubular foam filled 300 ohm feed line
was used, which has a VF of 0.8. Other feedlines may be used, for example,
slotted ribbon and the length of the stubs worked out using the correct
velocity factor




Building the lattin antenna




This will require some forethought and planning.




Avoid cutting the continuous top wire, which supports the whole system.




I wonder if it might be an idea to use a suitable polypropylene line to
support the wire, which may be subject to breaks, especially at the solder
points?




A suitable centre piece may be constructed and constructors may want to
include a balun at the centre of this balanced antenna, which is fed with
unbalanced line (coax).




A version of the Lattin could be designed for all bands, including the WARC
bands get snipping!

The post The Lattin 5 band Antenna appeared first on IW5EDI Simone -
Ham-Radio.