www.citizensbandradio.org.uk| www.citizensbandradio.org.uk :: Forums :: UK CB Radio Discussion Forums :: Technical Forums |
|
<< Previous thread | Next thread >> |
| Home made antennas | ||
| Go to page 1 2 [3] | |
|
Moderators: Guzzy, 26TM001, JazzMan
|
| Author | Post | ||
| enigma1 |
| ||
  Registered Member #711 Joined: Thu Jan 15 2009, 01:43PMLocation: co.durham uk Posts: 1159 | im still searching for an atu for the 706 before i can even attempt to use my g5rv. so for now i cant use hf band apart from cb and 10m. so its been shelved for now til i get atu 26 tm 159 (allan) icom ic 706 mk2 president lincoln stalker st9 fdx uniden 100 (black front, thanks ericcson) dual band co linear antenna G5RV solarcon A99 k40 (mobile) I REJECT YOUR REALITY, AND SUBSTITUTE MY OWN | ||
| Back to top | | ||
| hamish |
| ||
  Registered Member #922 Joined: Tue Dec 01 2009, 09:05AMLocation: South West Posts: 12 | for 11m, I would have thought a half wave doublet using twin 450 ohm feeder to a 1-1 balun and the shortest possible length of coax to the tranceivier (from the balun) would be the way to go,, this antenna allows all the power to radiate from the antenna unlike using a coax feed, which will have a high impedance at the antenna, thereby giving high losses. Using the formula of 468 divided by the frequency of 277812 gives a length for a half wave of 16ft and 8", therefore each element will be 8ft 4", If the coax feed on the common diapole is inadvertantly cut to a mutiple of the required wavelength this will also change the characteristics, impedance and swr of the antenna. With the doublet, the feed length is unimportant. Hope this is helpful. | ||
| Back to top | | ||
| hamish |
| ||
| Registered Member #922 Joined: Tue Dec 01 2009, 09:05AMLocation: South West Posts: 12 | You could also try the full wave loop with 450 ohm ladder feed. 1005 divided by the frequency ! | ||
| Back to top | | ||
| northern35s |
| ||
| Registered Member #946 Joined: Thu Jan 07 2010, 03:13PMPosts: 1 | enigma1 wrote ... im still searching for an atu for the 706 before i can even attempt to use my g5rv. so for now i cant use hf band apart from cb and 10m. so its been shelved for now til i get atu Make a simple wire dipole for 20m and you're on the air quick sharp, I think you'll be surprised how well it works  [ Edited Thu Jan 07 2010, 04:20PM ] | ||
| Back to top | | ||
| enigma1 |
| ||
| Registered Member #711 Joined: Thu Jan 15 2009, 01:43PMLocation: co.durham uk Posts: 1159 | ive got the g5rv up and the swr is good for 40/20m so im a happy lad now. now to see what i can get while qrp lol 26 tm 159 (allan) icom ic 706 mk2 president lincoln stalker st9 fdx uniden 100 (black front, thanks ericcson) dual band co linear antenna G5RV solarcon A99 k40 (mobile) I REJECT YOUR REALITY, AND SUBSTITUTE MY OWN | ||
| Back to top | | ||
| Bigpimp347 |
| ||
  Registered Member #82 Joined: Wed Oct 31 2007, 09:28AMLocation: Nottingham Posts: 466 | i've got a full wave loop in the loft for 11mtrs, receives as good as my sigma 4..!!!! well some times... SWR 1.1:1 or there abouts 26 to 30mhz is not bad either..!!!! I want to die asleep like my grandad did, Unlike his passengers, Screaming and shouting. WEB LINK live CB in Nottingham 24hr a day.. Now on channel 19 UK FM and 27.555 USB.. | ||
| Back to top | | ||
| Go to page 1 2 [3] | |
Powered by e107 Forum System
