[Lowfer] W5JGV E-Probe antenna

[Paul Daulton]

Ralph how abourt a 300khz lowpass filter between the antenna and the rx 
inside. If your 500khz tx is overloading the antenna itself that might not 
work . A buddy of mine built a bandpass filter for 185khz with a couple of 
455if cans. He claimed it improved his reception.

My observations with argo is that the software is desensed, like lightning 
for example.My lowfer beacon is
160ft from my rec antennas. At 187.5 khz I got some desense from my beacon 
receiving WEB at 189.95khz. to copy the watering hole I would set my rec to 
186khz and lower sideband and I got a few copies of CV and XR with my beacon 
on. Since I have moved to the watering hole at 185.3 I could copy WEB at 
189.95 with no desense. I also have noted on 137 my SDR, an Elector, was 
immune to desense from lightning. It copied the 137 guys well but not so 
good at 189.95. It needs a little more gain. I used a commercial Low pass 
filter ahead of the SDR.with out the lowpass there is a lot of hash and 
birdies from BC.

While the grabber is somewhat broken up by the 500khz it still provides 
usefull data about the propagation between us.

I could loan you my LPF if you like. Its about the size of a hand held HT 
with bnc connectors all soldered up in a metal box. A friend of mine 
salvaged it from some kind of test equipment.Might be worth a try.

Paul k5wms
----- Original Message ----- 
From: "W5JGV (Ralph Hartwell)" <w5jgv at spectrotek.com>
To: "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Saturday, February 20, 2010 8:22 PM
Subject: Re: [Lowfer] W5JGV E-Probe antenna


>> Ralph , It is wonderful for you to provide us with a grabber
>> that works so well . I check it often and it is a great
>> resource to have .
>>
>> Quite interesting to see its height location and cable run ,
>> given its amazing performance !!
>
>
> Hello Charlie,
>
> You're welcome!  I just wish there were an easy way to fix the overload
> problem between the RX antenna and my transmitter.
>
> 73,
>
> Ralph   W5JGV - WD2XSH/7
>
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