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 <charlesh3@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-bounces@contesting.com> on behalf of Mike Waters
<mikewate@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 <nhp@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
>
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