[Lowfer] (wm remote rx)

[Michael Sapp]

OK Mike, I understand the limitations. From my experience with argo just 
last week with the Part 5 station across town 13~15 miles away I needed some 
substantial attenuation to get into a linear range where argo would report 
dB changes close to my attenuator value changes. Just keep that in 
mind.....as agc off and  a true rms meter is really what is needed....yet 
even relative indication will certainly be useful to estimate potential 
field strength improvements as long as the compression is not too deep...

Mike tts


----- Original Message ----- 
From: "N8OOU" <n8oou at meekfarm.us>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Monday, February 09, 2015 12:02 PM
Subject: Re: [Lowfer] (wm remote rx)


> Mike - TTS,  Thanks for the feedback on rx levels.  I haven't said much 
> about what I'm working on there because I'm am still getting the kinks 
> worked out.  I plan to put a raspberry Pi there with an RTL-SDR and up 
> converter. That setup will be using direct signal strength numbers, no 
> argo.
>
> For the time being, while I work on the Pi, I put the IC-706 in there with 
> Argo. The antenna is a 1 meter square, 8 turn loop with a preamp. The 706 
> is soooooo deaf at 185, that I don't have an audible copy of the Wm 
> beacon. Also you can't turn the AGC off on it, but I do have the rf gain 
> turned down some. At least it is a stable receiver.  My tests yesterday 
> showed I could see 5dB reductions in the drive level down to .6 watts 
> input power. The next drop was not enough to drive the P.A.
>
> Mike - OOU
>
> 73   de   N8OOU - Mike Meek
>
> On 02/09/2015 10:27 AM, wa3tts wrote:
>>
>> Mike: You may need some attenuation on the remote rx input as well...my 
>> guess is a rx level around minus 40 in argo would greatly assist in the 
>> linearity of results as well as having agc off on both rx and argo....
>>
>> 73, Mike wa3tts
>>
>>
>>
>> Sent from Samsung tablet.
>>
>>
>> -------- Original message --------
>> From: N8OOU <n8oou at meekfarm.us>
>> Date: 02/09/2015  10:43 AM  (GMT-05:00)
>> To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer 
>> bands" <lowfer at mailman.qth.net>
>> Subject: Re: [Lowfer] DK7FC WSPR-15
>>
>> Garry, yesterday, I was testing my remote receiver which is located
>> about 5 miles away.  Two tests took about a half hour each around 17:xx
>> and 22:xx utc.  I put an attenuator box in the coax feed to the P.A.
>> which dropped the drive level. I was documenting the P.A. input V. / A.
>> while getting captures from the remote.
>>
>> This morning I see from the remote capture, that my signal looks about
>> the same as when I had 15 dB of attenuation in the test yesterday. I
>> left the attenuator inline overnight, but with no reduction of power.
>> I'll take it out of line (15:35 utc) and see if my next capture at 15:58
>> utc comes back up.
>>
>> The only other change is the temps and ground thaw yesterday. Today we
>> are getting a little colder again. For the next few days we are going
>> above 32 daytime and below at night.  I don't expect the ground to 
>> freeze.
>>
>> Mike - OOU
>>
>>
>> 73   de   N8OOU - Mike Meek
>>
>> On 02/09/2015 08:38 AM, Garry Hess wrote:
>>> Mike, I looked too but nothing noted here other than a constant weak
>>> spur practically on top of DK7FC's frequency. Interesting that it's
>>> present in your capture too so it must not be local. As mentioned before
>>> I'm not seeing RTTY from HGA22 and DCF39 like last year when DK7FC did
>>> decode here.
>>>
>>> Incidentally, lowfer WM is not currently visible here, after a few days
>>> of very strong signals. EAR, MLS, and MP are coming in fine so think WM
>>> has issues again.
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