TT'ers, I just ordered an F12 C31XR. I have been told by experienced users that the beam can be a pain to tune properly on 15 (high swr). I ordered the beam with single feed. Since then I have heard
Ron, Mine resonates at 28.64 - 1.1:1 21.22 - 1.25:1 14.1 - 1.2:1 Single feed. N2TK, Tony TT'ers, I just ordered an F12 C31XR. I have been told by experienced users that the beam can be a pain to tune
Where did you make those measurements? If at the shack end of the coax, they are quite meaningless as to antenna resonance. The only way to get the correct measurements is AT THE ANTENNA. Sorry, but
What changes the resonance at the shack? 73, Keith NM5G --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Don Havlicek Sent: Thursday,
When measuring the 'resonance' of an antenna at the shack, you are NOT measuring the antenna's resonance .. you are measuring the resonance of the antenna and feedline. Remember .. the feedline SHOUL
Is it resonance that changes? I thought it was impedance. 73, Keith NM5G When measuring the 'resonance' of an antenna at the shack, you are NOT measuring the antenna's resonance .. you are measuring
Using a single feed, my C-31XR resonated (measured in the shack, where my transmitter is) well below 21.0 MHz (209??). N6BT suggested cutting an inch, I think he said, off the end of each side of the
Seems to me the original poster mentioned SWR @ frequencies of interest. The assumption made there is that "lowest SWR = resonance". When measuring at the shack end, that lowest SWR will indicate whe
I mentioned this before, my swr was fine just no bandwidth maybe 100khz. They sent me a package that cost $45 and consisted of two new 15 mtr element tips for the driven element and two coupling coil
Depends if you're measuring dips in SWR or actual resonance (i.e. no reactive component in impedance). If you're measuring the SWR (not the R+jX) at the shack end, the transmission line just moves th
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 1 Sep 2006 18:49:24 -0400
Not even then if you have a good, non reactive match at resonance, but it is a poor place to try and find resonance. Roger Halstead (K8RI and ARRL 40 year Life Member) N833R - World's oldest Debonai
Just out of curiosity, how do you make those measurements at the antenna without your body affecting the results? On many antennas it is almost impossible to position yourself at the feed point anywa
JC, The issue with "at the feedpoint" vs. Force 12's specifications which call for 100' of coax is LOSS. Loss in the coax, even 1 dB in 100' for RG-213 at 28 MHz, causes the apparent SWR and SWR band
Hi Joe, I understand about the line loss, and what it does, but aren't you still finding the "resonant" freq. of the antenna by finding where the VSWR dips? Assuming you didn't screw up in constructi
how i do it; go to the end of your feedline and hook a light bulb to the line instead of the antenna. key the transmitter and watch the bulb does it light? mike w7dra ________________________________