Home |
Search |
Today's Posts |
|
#1
![]() |
|||
|
|||
![]()
I have constructed a homeade antenna that is mounted on a trunk-lip mount on
a Nissan Sentra. The bottom is 18" of 1/2" copper pipe with a 3/8" theaded adapter soldered in the bottom. There is a 9" long peice of pvc with a 2" diameter 6ga. copper coil around it. Then there is 4" more copper pipe with a 3ft' stainless tip on top. The problem is that it would be too easy to bend the trunk with copper pipe. I thought about a spring but then the whole thing would bend too much when the trunk is opened. If I move the coil down below roof level, the SWR goes way up. I thought about using pvc for the lower part but I can't quite figure out how to construct it. I may take some pictures of what I have. Stay tuned...... |
#2
![]() |
|||
|
|||
![]()
Here are some pictures
http://home.earthlink.net/~cjohnson1379/ "Chris" wrote in message nk.net... I have constructed a homeade antenna that is mounted on a trunk-lip mount on a Nissan Sentra. The bottom is 18" of 1/2" copper pipe with a 3/8" theaded adapter soldered in the bottom. There is a 9" long peice of pvc with a 2" diameter 6ga. copper coil around it. Then there is 4" more copper pipe with a 3ft' stainless tip on top. The problem is that it would be too easy to bend the trunk with copper pipe. I thought about a spring but then the whole thing would bend too much when the trunk is opened. If I move the coil down below roof level, the SWR goes way up. I thought about using pvc for the lower part but I can't quite figure out how to construct it. I may take some pictures of what I have. Stay tuned...... |
#3
![]() |
|||
|
|||
![]()
Chris;
Nice home brewed antenna for the mobile. You are right about bending the trunk lip with an antenna that size. Some people use guy wires, made out of nylon rope or string, to take some of the forces off the antenna while driving. Most people use a form of bumper mount, or the trailer hitch. Either one would let you construct a more robust mount for the antenna. Also I would strongly suggest that you don't use regular lead-tin solder for any area that you have to have high mechanical strength. It will crack I'll guarantee you. You will have to use silver solder in its place. Also try posting some messages on "rec.radio.amateur.antenna". They don't care if you're a Ham, CBer, or what ever so long as you have an interest in antennas. Some of those guys have already been down the road you're on and can give you some VERY valuable tips on how to go about your project. Good luck. -- Leland C. Scott KC8LDO Wireless Network Mobile computing on the go brought to you by Micro$oft "Chris" wrote in message nk.net... Here are some pictures http://home.earthlink.net/~cjohnson1379/ "Chris" wrote in message nk.net... I have constructed a homeade antenna that is mounted on a trunk-lip mount on a Nissan Sentra. The bottom is 18" of 1/2" copper pipe with a 3/8" theaded adapter soldered in the bottom. There is a 9" long peice of pvc with a 2" diameter 6ga. copper coil around it. Then there is 4" more copper pipe with a 3ft' stainless tip on top. The problem is that it would be too easy to bend the trunk with copper pipe. I thought about a spring but then the whole thing would bend too much when the trunk is opened. If I move the coil down below roof level, the SWR goes way up. I thought about using pvc for the lower part but I can't quite figure out how to construct it. I may take some pictures of what I have. Stay tuned...... |
#4
![]() |
|||
|
|||
![]() "Leland C. Scott" wrote in message ... Also try posting some messages on "rec.radio.amateur.antenna". They don't care if you're a Ham, CBer, or what ever so long as you have an interest in antennas. Unlike you, you faggot ass cock sucker. "Leland C. Scott" wrote in message: He's going to get a Ham ticket so he's not limited to putzing around on 11m any more. -- Leland C. Scott KC8LD0 |
#5
![]() |
|||
|
|||
![]() "Bada Bing" wrote in message s.com... "Leland C. Scott" wrote in message ... Also try posting some messages on "rec.radio.amateur.antenna". They don't care if you're a Ham, CBer, or what ever so long as you have an interest in antennas. Unlike you, you faggot ass cock sucker. "Leland C. Scott" wrote in message: He's going to get a Ham ticket so he's not limited to putzing around on 11m any more. Leland C. Scott KC8LD0 KC8LDO, offended the nation and disgraced himself by undermining the death and tragedy in NYC while comparing it to his personal crusade of cleaning up the cb channels with: That's easy to explain. As another poster a short time back said about Part 95 rules "I don't care", well you see what happens when that mind set gets applied in a different context. It is very apparent they didn't care about human life either, including their own. Leland C. Scott KC8LDO ARRL Member |
#6
![]() |
|||
|
|||
![]()
"Twistedhed" wrote in message ws.com...
KC8LDO, offended the nation and disgraced himself by undermining the death and tragedy in NYC while comparing it to his personal crusade of cleaning up the cb channels with: That's easy to explain. As another poster a short time back said about Part 95 rules "I don't care", well you see what happens when that mind set gets applied in a different context. It is very apparent they didn't care about human life either, including their own. Leland C. Scott KC8LDO ARRL Member Leland Scott is one of the most honest and honorable men ever to post in rrcb and your twisted propoganda can't ever change that. |
#7
![]() |
|||
|
|||
![]()
"Chris" wrote in message ink.net...
Here are some pictures http://home.earthlink.net/~cjohnson1379/ "Chris" wrote in message nk.net... I have constructed a homeade antenna that is mounted on a trunk-lip mount on a Nissan Sentra. The bottom is 18" of 1/2" copper pipe with a 3/8" theaded adapter soldered in the bottom. There is a 9" long peice of pvc with a 2" diameter 6ga. copper coil around it. Then there is 4" more copper pipe with a 3ft' stainless tip on top. The problem is that it would be too easy to bend the trunk with copper pipe. I thought about a spring but then the whole thing would bend too much when the trunk is opened. If I move the coil down below roof level, the SWR goes way up. I thought about using pvc for the lower part but I can't quite figure out how to construct it. I may take some pictures of what I have. Stay tuned...... yes I agree you do nice work chris one question though the 6ga copper coil and 1/2 in copper pipe are overkill for CB no need to go that big unless you are running megawatts. Even with your illegal 100 w amp you still only need a wilson or equivelent that would be much less weight and problems. but may be you just like the look of it etc. the heavy duty badass appearance kind of like car hood hold down pins on a stock engine lol |
#8
![]() |
|||
|
|||
![]()
Thanks. I just wanted to prove to myself that I could make my own antenna
and see how well it worked. There are 2 reasons for the large coil. In comparing a few antennas of roughly equal length, the ones with large open coils tend to be more broad-banded. Larger materials also have less resistive loss and more radiating are. The lower part doesn't really have to be 1/2' copper pipe but it was the first thing I thought of. I'm going with copper wire wrapped on pvc shortly. Chris "I Am Not George" wrote in message m... "Chris" wrote in message ink.net... Here are some pictures http://home.earthlink.net/~cjohnson1379/ "Chris" wrote in message nk.net... I have constructed a homeade antenna that is mounted on a trunk-lip mount on a Nissan Sentra. The bottom is 18" of 1/2" copper pipe with a 3/8" theaded adapter soldered in the bottom. There is a 9" long peice of pvc with a 2" diameter 6ga. copper coil around it. Then there is 4" more copper pipe with a 3ft' stainless tip on top. The problem is that it would be too easy to bend the trunk with copper pipe. I thought about a spring but then the whole thing would bend too much when the trunk is opened. If I move the coil down below roof level, the SWR goes way up. I thought about using pvc for the lower part but I can't quite figure out how to construct it. I may take some pictures of what I have. Stay tuned...... yes I agree you do nice work chris one question though the 6ga copper coil and 1/2 in copper pipe are overkill for CB no need to go that big unless you are running megawatts. Even with your illegal 100 w amp you still only need a wilson or equivelent that would be much less weight and problems. but may be you just like the look of it etc. the heavy duty badass appearance kind of like car hood hold down pins on a stock engine lol |
#9
![]() |
|||
|
|||
![]() |
#10
![]() |
|||
|
|||
![]() rotflmao I dont think mounting 8 lb. of plumbing on your trunk lid is efficient. There are easier ways to get bandwith. for example if you want efficient youd be using a 9 ft whip. even bent over like a bow the 9 ft is more efficient than a 4 ft loaded open air coil model. Huh......... A bent over 9 foot whip has a very noticeable Loss compared to a efficient 4 or 5 foot vertical. |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
Ideas for a home built 2meter/440 dual band base antenna | Antenna | |||
FS: Connectors/Adapters/Meters/Etc. | Equipment | |||
Need HF / Mobile Antenna Recommendation | Antenna | |||
Wanted: SWAN Mobile Antenna Info | Antenna |