Would anyone have any documentation on this Digital Display Unit?

Can you tell me what Radio(s) it is for?

The Power connector isn't marked. Can anyone tell me what power it
takes and how the polarity lines up with the Two Socket Plug. (There is
a key between the two sockets.

Much like

O u O

Any Help or Documentation would be GREATLY APPRECIATED!!!!




S.

Samantha wrote:
Would anyone have any documentation on this Digital Display Unit?

Can you tell me what Radio(s) it is for?

Nope, but if you plug a signal generator into it, you should be able to
get it to start displaying something. Work out the difference between
the signal generator input and the display, and then you'll know what
radios you can use it with.

The Power connector isn't marked. Can anyone tell me what power it
takes and how the polarity lines up with the Two Socket Plug. (There is
a key between the two sockets.

Much like

O u O


Dunno, look at the power supply capacitors. Try giving it an input voltage
around half of what they are rated for, then try cranking it up a little
bit until you get a stable display. If there's a 7805 or something in
there, you can probably make a good guess about what voltage range it will
work with.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

In article ,
(Scott Dorsey) wrote:

Samantha wrote:
Would anyone have any documentation on this Digital Display Unit?

Can you tell me what Radio(s) it is for?

Nope, but if you plug a signal generator into it, you should be able to
get it to start displaying something. Work out the difference between
the signal generator input and the display, and then you'll know what
radios you can use it with.

The Power connector isn't marked. Can anyone tell me what power it
takes and how the polarity lines up with the Two Socket Plug. (There is
a key between the two sockets.

Much like

O u O


Dunno, look at the power supply capacitors. Try giving it an input voltage
around half of what they are rated for, then try cranking it up a little
bit until you get a stable display. If there's a 7805 or something in
there, you can probably make a good guess about what voltage range it will
work with.
--scott

There are three RCA jacks in the back for the input.. They are labeled
H C V

Not sure what kind of signal that would take... I did find an old post
of a question that read:


http://forums.qrz.com/archive/index.php/t-173825.html


7US
08-25-2008, 02:06 AM
I have a Kenwood TS-820 with a Grand GD-6K aftermarket digital readout.
One of the wires came loose from the plug in to the eight pin remote
socket. It is the wire marked "C" on the back of the unit. Can anyone
helpme figure out where that wire goes? I got the rtadio used some years
ago, and there are no instructions.
Thanks

KK7US, Lee



This is the only reference to the counter that I have found. Don't know
if that helps any..

???


Thanks

Samantha wrote:


There are three RCA jacks in the back for the input.. They are labeled
H C V

I'm going to take a very wild guess and say Heterodyne Oscillator,
Carrier Oscillator and VFO.

As to how to access those points in the radio I haven't a clue.

-Bill

In article ,
Bill M wrote:

Samantha wrote:


There are three RCA jacks in the back for the input.. They are labeled
H C V

I'm going to take a very wild guess and say Heterodyne Oscillator,
Carrier Oscillator and VFO.

As to how to access those points in the radio I haven't a clue.

-Bill



There are three RCA jacks in the back for the input.. They are labeled
H C V

I'm going to take a very wild guess and say Heterodyne Oscillator,
Carrier Oscillator and VFO.

As to how to access those points in the radio I haven't a clue.

-Bill

What I found out:

Power + goes to the right of the unverted U with the inverted U on the
bottom. - to the Left.
seems to start working at 9VDC. There is a 5VDC Regulator in side the
box and a 25VDC 470pf Filter cap (before the regulator). I think it is
a dual supply system. Some may take 12VDC and other take 5VDC. I
didn't crank it to 12 Volts since I wasn't sure and didn't want to burn
out the unit.

C input took a 1 - 3 volt square or sine wave and displayed from 0 to
31 MHZ. It started dropping off after that. I didn't put the sine wave
aplitude any higher that 3 Volts, though TTL would suggest a voltage of
2 to 5 Volt logic 1. it seem to pick up the signal even when it dropped
lower, but I didn't get diffinitive measurements of when it completely
dropped and no longer triggered the frequency counter / display unit.

Now, What would be the use of the H and V connections if they are indeed
Heterodyne Oscillator or VFO...

Would ALL THREE need to be hooked up? Or was it built for several
different rigs where you only had to connect up one of the RCA jacks. I
am thinking this is not the case since mine has three RCA jacks hooked
up to it and they seemed to have been with the unit since i got in a box
of stuff from an estate sale.


Thanks in advance for all your help!!!

Hope to hear more ideas!!

In article ,
Samantha wrote:

In article ,
Bill M wrote:

Samantha wrote:


There are three RCA jacks in the back for the input.. They are labeled
H C V

I'm going to take a very wild guess and say Heterodyne Oscillator,
Carrier Oscillator and VFO.

As to how to access those points in the radio I haven't a clue.

-Bill



There are three RCA jacks in the back for the input.. They are labeled
H C V

I'm going to take a very wild guess and say Heterodyne Oscillator,
Carrier Oscillator and VFO.

As to how to access those points in the radio I haven't a clue.

-Bill

What I found out:

Power + goes to the right of the unverted U with the inverted U on the
bottom. - to the Left.
seems to start working at 9VDC. There is a 5VDC Regulator in side the
box and a 25VDC 470pf Filter cap (before the regulator). I think it is
a dual supply system. Some may take 12VDC and other take 5VDC. I
didn't crank it to 12 Volts since I wasn't sure and didn't want to burn
out the unit.

C input took a 1 - 3 volt square or sine wave and displayed from 0 to
31 MHZ. It started dropping off after that. I didn't put the sine wave
aplitude any higher that 3 Volts, though TTL would suggest a voltage of
2 to 5 Volt logic 1. it seem to pick up the signal even when it dropped
lower, but I didn't get diffinitive measurements of when it completely
dropped and no longer triggered the frequency counter / display unit.

Now, What would be the use of the H and V connections if they are indeed
Heterodyne Oscillator or VFO...

Would ALL THREE need to be hooked up? Or was it built for several
different rigs where you only had to connect up one of the RCA jacks. I
am thinking this is not the case since mine has three RCA jacks hooked
up to it and they seemed to have been with the unit since i got in a box
of stuff from an estate sale.


Thanks in advance for all your help!!!

Hope to hear more ideas!!

ALSO 'someone' (lol) told me that the Grand was a rip off of another
design that was built for the TS-520 and the TS-820.. Anyone know of any
displays that were built for these radios back then?

I am not sure what radio that it actually hooks up to. I will have to
hope some of the old timers out there remember this Jewel and can come
up with some answers. I am also wondering if It could me modified to
fit other radios since it just seems to need 2-3v sine wave to make the
Freq Counter / Digital display to work...


Thanks again!!

S.

Samantha wrote:

Now, What would be the use of the H and V connections if they are indeed
Heterodyne Oscillator or VFO...

Would ALL THREE need to be hooked up? Or was it built for several
different rigs where you only had to connect up one of the RCA jacks. I
am thinking this is not the case since mine has three RCA jacks hooked
up to it and they seemed to have been with the unit since i got in a box
of stuff from an estate sale.


Thanks in advance for all your help!!!

Hope to hear more ideas!!

Well, as I indicated I was only guessing. And I still am.

For the unit to measure the actual frequency it needs to combine the H C
and V. Thats not necessarily found at any particular point in a
receiver. The actual frequency of the receive signal disappears beyond
the RF amp stage in a superhet radio. (A transmitter is different since
these are combined in order to transmit.)

The lashup is probably universal to many rigs. Not in the sense that
you use one single input versus another but that different radios would
have different frequencies for the heterodyne Osc, VFO, etc. You have
to combine them all to get the correct readout.

-Bill

Samantha wrote:


ALSO 'someone' (lol) told me that the Grand was a rip off of another
design that was built for the TS-520 and the TS-820.. Anyone know of any
displays that were built for these radios back then?

I am not sure what radio that it actually hooks up to. I will have to
hope some of the old timers out there remember this Jewel and can come
up with some answers. I am also wondering if It could me modified to
fit other radios since it just seems to need 2-3v sine wave to make the
Freq Counter / Digital display to work...


Thanks again!!

S.

Labelling things as a rip-off is somewhat subjective. There's 'x'
number of ways to measure a frequency and if one circuit resembles
another then any similarities shouldn't be a surprise. Jeez, how many
different models of AA5 radios are there out there all using the same
basic topology?

As I suggested in the previous post I gather that the unit was a
one-size-fits-all type of display that could work with many different
radios. That would be the rationale for the three inputs.

-Bill

In article ,
Bill M wrote:

Samantha wrote:


ALSO 'someone' (lol) told me that the Grand was a rip off of another
design that was built for the TS-520 and the TS-820.. Anyone know of any
displays that were built for these radios back then?

I am not sure what radio that it actually hooks up to. I will have to
hope some of the old timers out there remember this Jewel and can come
up with some answers. I am also wondering if It could me modified to
fit other radios since it just seems to need 2-3v sine wave to make the
Freq Counter / Digital display to work...


Thanks again!!

S.

Labelling things as a rip-off is somewhat subjective. There's 'x'
number of ways to measure a frequency and if one circuit resembles
another then any similarities shouldn't be a surprise. Jeez, how many
different models of AA5 radios are there out there all using the same
basic topology?

As I suggested in the previous post I gather that the unit was a
one-size-fits-all type of display that could work with many different
radios. That would be the rationale for the three inputs.

-Bill

Well, Just a follow up.. I dropped the 820 Idea and ran with the 520S
and looked at a online manual for the radio, It seems that kenwood made
a DG-5 that connected directly to three RCA jacks and a power jack in
the back of the radio.

Looking at the DG-5 Manual, it explains,

--------------

The TS-520S operating frequency is made up as:

oprfreq = HET-(VFO+CAR)

In the The DG-5 where two counter circuits are connected in series, the
heterodyne signal is fed to the lower counter. This lower counter
subtracts 10MHZ from the heterodyne frequency in a digital way
(HET-10MHz). The subtracted frequency presets the upper counter. The
other signal fed to the upper counter is composed in the manner that the
carrier frequency is mixed with the 10MHZ reference frequency and the
resultant is further mixed with the VFO frequency. [(10MHz-CAR) - VFO].
The signal is added to the one preset by the lower counter, that is:

[(10MHz-CAR) - VFO] + (HET - 10 MHz) = HET - (VFO + CAR)

As explained above you will find that the GD-5 should display the
correct TS-520S Operating frequency. The reason of using such a
complicated construction is that if the DG-5 is the same as the TS-520S
in the construction, this can produce a signal of the same frequency as
the receive frequency. The signal interferes as spurious with the
operation of the TS-520S.

-----------------


So just giving the (H) Jack an input would yield (operating freq = (Het
- [VFO (0) + CAR (also 0)]

The power plug also is keyed identically, and plugs directly into the
radio. The manual explains that you can use this connection (13.8VDC
..9A) or use an independent power supply.

I guess the only question I have left, Is.. How did KK7US get the GD-6K
to work with a TS-820???

Looking at the manual, I saw a connector for an external VFO... but I
don't think that is where it was hooked up to.


Idea's anyone???


Thanks!!!


S.