Great work! I've noticed that CB radio seems to be making a comeback in rural America almost like the golden era of CB radio from 1960 to around 1975 before the 40 channel "Good Buddy" phase of the hobby ruined it. Early CB radio operators were almost like Hams themselves and they actually knew about electronics and the mathematics of radio communication. I've been a licensed Ham for 30 years, but you can't beat CB for informal local chit-chat. I have a bone stock 1971 tube type E.F. Johnson Messenger 223 that does fantastic AM (plate modulation) and I've noticed more nighttime local talk. 73. Scott KK7VY.
Your 11 meter antennas can be scaled down to 10 meter antennas but probably won't be long enough for the 12 meter band. Here's the info for getting your first license. Add the w w w to the front of it: arrl.org/getting-your-technician-license Thanks for watching and 73! :)
Hi Dave. I actually took some time to build this antennas and it works great I got a 1:1 SWR on on channel 20 of the CB / 11 meter band. I also built a cheaper version using the same math out of #10 TW copper wire and 1/2" PVC and it produced the same results. My third antenna project is a horizontal polarized dipole made from #14 TW copper wire and some Plexiglas as insulators. All 3 antennas returned the same results and on a 7 watt CB radio with the horizontal dipole I can make contacts from as far out as Nevada and I am in Louisiana. With the vertical antennas I have no issues contacting people from up to 40 - 50 miles away
I mention grounding the antenna to prevent static discharge in part one. Attach a ground wire to the u-bolt directly under the UHF connector (the u-bolt that holds the connector to the boom) and run it in the same direction as the coaxial cable. Thanks for watching and 73. :)
Any CBs around the Concord NC I just got back in to it. Had a great time in the late 60s to the the early 60s and got out.I ran a old tube Comstat -25A 23 channel base station.
Yes and thus my calculated lengths as described in part 1 of this video. On HF the length is not quite as critical as the length for a VHF or UHF antenna because you'll most likely have to lengthen or shorten the antenna by a few inches. Thanks for watching and 73! :)
Another great video series Dave!!! I know they are to close together, but if you were to extend the mast up to the top of the upper element, could the mast be used as a possible reflector? I have wondered if this would work, for years. Keep up the great videos, as you encourage many to try building antennas. 73 :-)
Thumbs up Dave! I have seen other videos of yours..(Inverted V I left a comment on that video too). I am still trying to grasp your/the concept of the placement/distance between both elements as they come out of the chassis female connector and attach to the mounting plate. Does it affect the over all length of the initial calculations you made in your diagram? Could you please elaborate. Thank you for your videos.
PDL2 can be adjusted with the Gamma matches it has to cover 12m and 10m. I use PDL2 for 10m when it`s open. Great antenna when used flatside. It has a sort of vertical and horizontal switching in it which is rather interesting.
I would build a Moxon rectangle and use a tuner. Covers 12/11/10 meters no problem. You could also use an Antron A-99 or Procomm PT-99 and a tuner and use it on 15 meters as well. it will work even on 20 meters (loads up) but isn't the best antenna to use. However you will make contacts.
Dave, I am going to build this antenna. I live in central Florida so I have some serious winds at times. I was curious to know what you think about using a bolt through the joins instead of pipe clamps once the correct lengths are tuned in. Thanks.
I wonder how many turns on a 1" fiberglass rod it would require to phase match & direct feed another 1/2 wave atop that one if you used two 5 foot lengths of tubing, 1.25" then 1.125" inside and slid down until tuned and large enough for a 1" rod insulator between 1/2 waves. I'm guessing about 12' of wire making the approximately 40T coil? Have you ever tried that one - building a true colinear? 73
i have a starduster swr 1.2 on ch1 and 1.1 on ch40. radials are longer than the radiator.radiator is at 102" after i got the 102 " on the antenna i adjusted swrs with the radials when i press carrier i got 3.5w but when i modulate goes to 3W@ 2.5 W why? the harder i modulate the out put drops
So why does the description say peg leg when it is clearly a dipole? I don't know whether I missed it, but us there a 1:1 balun involved or at least a choke considering this is a balanced antenna? And what about the fact a dipole is around 70 odd ohms? Did I miss something?
hi there me too have this antenna made out of 2 102" antennas they work excellent with propagation talk from florida to venezuela, chile , mexico,cuba...costa rica colombia etc...
Very nice antenna and very nice video I enjoy all your videos but i have a question you could put a Gamma match for this proyect because on Ebay sell some similar Balcony antenna??
This type of antenna could use a matching circuit if you want to operate the antenna at its true resonance on the desired frequency. The operator tuned the antenna to exhibit 50 ohms impedance for a 1.1 SWR, but you will notice the reactance (X) is around 8. The reactance will probably go up even higher as the antenna is raised up higher in the air. A non-zero reactance when at 50 ohms means the antenna is NOT resonant. I'm assuming the dipole would be closer to ~70 ohms higher up in the air. A matching circuit could help alleviate this situation. It's obviously not required, but performance could be improved by doing so IF the losses of the matching circuit don't overcome the performance gain.
I have the 142GTL with uppers/lowers and variable power. Wonderful rigs! How well do think that antenna will do 40-45ft in the air compared to an A99 with ground plane? W0QGS Richard
I think an Antron 99 is just a glorified vertical dipole encased in fiberglass (or whatever) anyway, so you would expect them to perform about the same assuming equal heights. Have people seen improvements with the ground radials on an A-99? Ground radials could be added to this homemade vertical dipole, but I doubt it would improve the performance of it. I would think a plain vertical dipole like this would be much better for local talk due to the radiation take off angle differences between this antenna and an antenna that "sees" an artificial elevated "ground" like a ground plane. 73. Scott KK7VY
dave.im an old cb er from the seventies, I want to get back into radio, I have a few old cobra bases, a siltronix 1011 d- a new in the box original Avanti astroplane, a Avanti pdl 2 and a brand new Saturn conex 33. hoe do I go about getting a ham licsense and can I use these antennas I mentioned for ten and twelve meters as well as 11, thanks so much
Hi Dave, I have seen dipoles for the cb band 11m which have a gamma match in them. I`m not sure why they bother with having one? Is it just to make the antenna resonate where you want it within one meg? I also think the gamma match improves the directivity of the dipole.. I may be wrong and just wondered about your opinion on dipoles with gamma match.
with a dipole such as this you are feeding it with a 50 ohm feedline feeding a balanced antenna with an unballance feedine your radio is seeing a 1/1 match but at the feed point it is not matched causeing some ineffecincy
I was wondering (I know, my question may be very ignorant, but I am a novice) what formula to use if I wanted to make this kind of aerial for 2m/70cm. For 2m I used 234/147 and came out to just under 1' 60. But how do I combine both frequencies to divide 234 by that figure? I really love that kind of dipole.
Great work!
I've noticed that CB radio seems to be making a comeback in rural America almost like the golden era of CB radio from 1960 to around 1975 before the 40 channel "Good Buddy" phase of the hobby ruined it. Early CB radio operators were almost like Hams themselves and they actually knew about electronics and the mathematics of radio communication. I've been a licensed Ham for 30 years, but you can't beat CB for informal local chit-chat. I have a bone stock 1971 tube type E.F. Johnson Messenger 223 that does fantastic AM (plate modulation) and I've noticed more nighttime local talk.
73. Scott KK7VY.
Your 11 meter antennas can be scaled down to 10 meter antennas but probably won't be long enough for the 12 meter band. Here's the info for getting your first license. Add the w w w to the front of it: arrl.org/getting-your-technician-license Thanks for watching and 73! :)
Hi Dave. I actually took some time to build this antennas and it works great I got a 1:1 SWR on on channel 20 of the CB / 11 meter band.
I also built a cheaper version using the same math out of #10 TW copper wire and 1/2" PVC and it produced the same results.
My third antenna project is a horizontal polarized dipole made from #14 TW copper wire and some Plexiglas as insulators.
All 3 antennas returned the same results and on a 7 watt CB radio with the horizontal dipole I can make contacts from as far out as Nevada and I am in Louisiana. With the vertical antennas I have no issues contacting people from up to 40 - 50 miles away
Great stuff. How many miles have you got out on it? I take it you have it vertical?
Vertical I can get out for like 30 miles if its not noisy, My skywave or horizontal ones I can go skip from Louisiana to california
Thats good. Right then, my choice of antennas to make are slowly coming down!!
I mention grounding the antenna to prevent static discharge in part one. Attach a ground wire to the u-bolt directly under the UHF connector (the u-bolt that holds the connector to the boom) and run it in the same direction as the coaxial cable. Thanks for watching and 73. :)
Any CBs around the Concord NC I just got back in to it. Had a great time in the late 60s to the
the early 60s and got out.I ran a old tube Comstat -25A 23 channel base station.
Excellent work! That's my kind of CB radioing. 73's!
Yes and thus my calculated lengths as described in part 1 of this video. On HF the length is not quite as critical as the length for a VHF or UHF antenna because you'll most likely have to lengthen or shorten the antenna by a few inches. Thanks for watching and 73! :)
Another great video series Dave!!! I know they are to close together, but if you were to extend the mast up to the top of the upper element, could the mast be used as a possible reflector? I have wondered if this would work, for years. Keep up the great videos, as you encourage many to try building antennas. 73 :-)
Great job, Dave! Long time, no see!
Thanks Dave. Great series! Good wintertime project
Thumbs up Dave! I have seen other videos of yours..(Inverted V I left a comment on that video too). I am still trying to grasp your/the concept of the placement/distance between both elements as they come out of the chassis female connector and attach to the mounting plate. Does it affect the over all length of the initial calculations you made in your diagram? Could you please elaborate. Thank you for your videos.
PDL2 can be adjusted with the Gamma matches it has to cover 12m and 10m. I use PDL2 for 10m when it`s open. Great antenna when used flatside. It has a sort of vertical and horizontal switching in it which is rather interesting.
I would build a Moxon rectangle and use a tuner. Covers 12/11/10 meters no problem. You could also use an Antron A-99 or Procomm PT-99 and a tuner and use it on 15 meters as well. it will work even on 20 meters (loads up) but isn't the best antenna to use. However you will make contacts.
Dave, I am going to build this antenna. I live in central Florida so I have some serious winds at times. I was curious to know what you think about using a bolt through the joins instead of pipe clamps once the correct lengths are tuned in. Thanks.
I wonder how many turns on a 1" fiberglass rod it would require to phase match & direct feed another 1/2 wave atop that one if you used two 5 foot lengths of tubing, 1.25" then 1.125" inside and slid down until tuned and large enough for a 1" rod insulator between 1/2 waves.
I'm guessing about 12' of wire making the approximately 40T coil?
Have you ever tried that one - building a true colinear?
73
Nice Job!...How high did you end up raising that antenna??
Te quedó perrisima
i have a starduster swr 1.2 on ch1 and 1.1 on ch40.
radials are longer than the radiator.radiator is at 102" after i got the 102 " on the antenna i adjusted swrs with the radials
when i press carrier i got 3.5w but when i modulate goes to 3W@ 2.5 W why?
the harder i modulate the out put drops
nice one. i mite try this when i can. see how well my old cobra 2000gtl does after sitting awhile..
73's
kk6fct
So why does the description say peg leg when it is clearly a dipole? I don't know whether I missed it, but us there a 1:1 balun involved or at least a choke considering this is a balanced antenna? And what about the fact a dipole is around 70 odd ohms? Did I miss something?
hi there me too have this antenna made out of 2 102" antennas they work excellent with propagation talk from florida to venezuela, chile , mexico,cuba...costa rica colombia etc...
Very nice antenna and very nice video I enjoy all your videos but i have a question you could put a Gamma match for this proyect because on Ebay sell some similar Balcony antenna??
This type of antenna could use a matching circuit if you want to operate the antenna at its true resonance on the desired frequency. The operator tuned the antenna to exhibit 50 ohms impedance for a 1.1 SWR, but you will notice the reactance (X) is around 8. The reactance will probably go up even higher as the antenna is raised up higher in the air. A non-zero reactance when at 50 ohms means the antenna is NOT resonant. I'm assuming the dipole would be closer to ~70 ohms higher up in the air. A matching circuit could help alleviate this situation. It's obviously not required, but performance could be improved by doing so IF the losses of the matching circuit don't overcome the performance gain.
I have the 142GTL with uppers/lowers and variable power. Wonderful rigs! How well do think that antenna will do 40-45ft in the air compared to an A99 with ground plane?
W0QGS
Richard
I think an Antron 99 is just a glorified vertical dipole encased in fiberglass (or whatever) anyway, so you would expect them to perform about the same assuming equal heights. Have people seen improvements with the ground radials on an A-99? Ground radials could be added to this homemade vertical dipole, but I doubt it would improve the performance of it. I would think a plain vertical dipole like this would be much better for local talk due to the radiation take off angle differences between this antenna and an antenna that "sees" an artificial elevated "ground" like a ground plane. 73. Scott KK7VY
dave.im an old cb er from the seventies, I want to get back into radio, I have a few old cobra bases, a siltronix 1011 d- a new in the box original Avanti astroplane, a Avanti pdl 2 and a brand new Saturn conex 33. hoe do I go about getting a ham licsense and can I use these antennas I mentioned for ten and twelve meters as well as 11, thanks so much
Dave Tadlock can I use one whole piece element? for each side
Looks like a vertical dipole?
ok that is impressive!! swr of 1:1 thats lights out!!
Hi Dave, I have seen dipoles for the cb band 11m which have a gamma match in them. I`m not sure why they bother with having one? Is it just to make the antenna resonate where you want it within one meg? I also think the gamma match improves the directivity of the dipole.. I may be wrong and just wondered about your opinion on dipoles with gamma match.
with a dipole such as this you are feeding it with a 50 ohm feedline feeding a balanced antenna with an unballance feedine your radio is seeing a 1/1 match but at the feed point it is not matched causeing some ineffecincy
I was wondering (I know, my question may be very ignorant, but I am a novice) what formula to use if I wanted to make this kind of aerial for 2m/70cm. For 2m I used 234/147 and came out to just under 1' 60. But how do I combine both frequencies to divide 234 by that figure? I really love that kind of dipole.
Watch the 2m/70cm vertical dipole antenna video. :) 73 & thanks for watching.
Thanks 😊
GOOD DEAL SIR!
1.1 VSWR!!! Wrap it up and call it a day and get on and yak!
Perfect!
good swr