It's much more useful to think of RX loop antennas as having directivity rather than "gain." The full size flag has a rather broad pattern of around +/- 60 degrees so that it can be pointed to improve SNR vs directly towards the heading of interest. If a pre-amp increases the signal and noise by the same amount, you don't need the pre-amp. My flag is extremely quiet vs my shunt fed tower vertical. The F/S and F/B ratios are excellent. The SNR improvement over the vertical is dramatic.
73 - Steve WB6RSE On Aug 1, 2018, at 2:49 PM, Chuck Hutton <charle...@msn.com> wrote: But that gain is in the vicinity of small pennants, f;ags and others. I often use smaller loops and flags with a preamp. At 160 and nearby, I believe my preamps (Clifton Labs, ARR etc) have goodenough IM and NF properties to not affect results in a negative way. Having said that, the pattern is pretty lousy. I wouldn't bother with the LOG unless I was desperate man in a desperate situation. Chuck ________________________________ From: Topband <topband-boun...@contesting.com> on behalf of Mike Waters <mikew...@gmail.com> Sent: Wednesday, August 1, 2018 1:15 PM To: Nick Hall-Patch Cc: topband Subject: Re: Topband: WB6RSE Flag type loop question That's a terrible RX antenna. Did you see the losses?! Minus-forty-something dB on 160. 73, Mike www.w0btu.com<http://www.w0btu.com> WØBTU's Radio Communication Technical Articles and File ...<http://www.w0btu.com/> www.w0btu.com Amateur radio technical information by Mike Waters, W0BTU On Wed, Aug 1, 2018, 3:00 PM Nick Hall-Patch <n...@ieee.org> wrote: > DuckDuckGo brought up this at the top of its search: > http://kk5jy.net/LoG/ > > Presumably that is what you mean? > > best wishes, > > Nick > VE7DXR > > At 19:04 2018-08-01, CUTTER DAVID via Topband wrote: >> Drifting the thread slightly: I read an article recently regarding 2 >> loops of 15ft square separated by 15ft which the author called Loop >> On Ground, LOG. He claimed good results on receive over a period of >> a year. It was very low gain but had directional properties and was >> said to be quiet. I can't lay my hands on the site just now, but >> it might be of interest. >> >> David G3UNA > _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband