[Lowfer] DK7FC WSPR15 alert ... again tonight

[Jay Hainline]

No luck here with DK7FC. I also have local QRN that tends to kill 136 KHz
WSPR-15 reception at times.

Jay Hainline KA9CFD
Colchester, IL
On Feb 6, 2014 9:28 AM, "Michael Sapp" <wa3tts at verizon.net> wrote:

> Doug, Jay & All:
>
> Interesting that Doug also had no captures in the 0300 and 0400 hours.
> Similar result here past two nites...gap from 0230 through 0530 last nite
> and 0330 to 0630 the night before.  I've had a few DK7FC sequences in those
> time frames that might have been "capture-able" if it were not for local
> compact florescent lamp 2nd harmonic QRM wandering across Stefan's 137.610
> signal the past few nights.  The CF fundemental energy is fairly strong
> around 68.8 kHz in the 1,000uV range and comes and goes here. Likely a CF
> lamp in the local neighborhood on it's last legs leaking energy into AC
> wiring.   Second harmonic in the 136~138 range is audible, perhaps S3 or so
> and wandering around.  The problem is not in my house so it is not
> controllable at the source.  When the 68.8kHz energy goes away, so does the
> noise in the 136 ~ 138 range.   Otherwise I seem to hear OK in the 136~138
> range when the local noise environment is low....
>
>
> 2014-02-06 07:00   DK7FC   0.137611   -38   0   JN49ik   1   WA3TTS EN90xn
>   6636   298
> 2014-02-06 06:30   DK7FC   0.137611   -37   1   JN49ik   1   WA3TTS EN90xn
>   6636   298
> 2014-02-06 05:30   DK7FC   0.137610   -36   1   JN49ik   1   WA3TTS EN90xn
>   6636   298
> 2014-02-06 02:30   DK7FC   0.137610   -39   -1   JN49ik   1   WA3TTS
> EN90xn   6636   298
> 2014-02-05 07:00   DK7FC   0.137610   -41   0   JN49ik   1   WA3TTS EN90xn
>   6636   298
> 2014-02-05 06:30   DK7FC   0.137610   -35   1   JN49ik   1   WA3TTS EN90xn
>   6636   298
> 2014-02-05 03:30   DK7FC   0.137609   -35   1   JN49ik   1   WA3TTS EN90xn
>   6636   298
> 2014-02-05 03:00   DK7FC   0.137609   -35   -1   JN49ik   1   WA3TTS
> EN90xn   6636   298
> 2014-02-05 02:30   DK7FC   0.137609   -41   1   JN49ik   1   WA3TTS EN90xn
>   6636   298
>
>    I had given some thought to changing the gain resistor on the MC1496
> active mixer in the Heath converter to possibly lower the intermod
> potential.....there is enough system gain to turn the mixer gain down a
> bit.....then again, one would think the MC1496 could handle 1,000uV at 68
> kHz without generating significant intermod products.  I may do the 3dB
> attenuator intermod test on the VLF converter input this afternoon to
> evaluate.....
>
> Thanks in advance for the bandwidth....
>
> 73,  Mike wa3tts
>
>
>
>
> ----- Original Message ----- From: "Douglas D. Williams" <kb4oer at gmail.com
> >
> To: "Discussion of the Lowfer (US, European, &amp, UK) and MedFer bands" <
> lowfer at mailman.qth.net>
> Sent: Thursday, February 06, 2014 5:56 AM
> Subject: Re: [Lowfer] DK7FC WSPR15 alert ... again tonight
>
>
>  Thanks for the info, Jay. Success here.
>>
>> -Doug
>>
>> 0200 -32 0.8 0.137612 0 DK7FC JN49 30
>>
>> 0230 -37 1.5 0.137612 0 DK7FC JN49 30
>>
>> 0500 -35 1.8 0.137612 0 DK7FC JN49 30
>>
>> 0600 -37 1.8 0.137612 0 DK7FC JN49 30
>>
>> 0630 -35 0.4 0.137612 0 DK7FC JN49 30
>>
>>
>> On Wed, Feb 5, 2014 at 6:07 PM, <jrusgrove at comcast.net> wrote:
>>
>>  DK7FC transmitting WSPR15 on 136.000 (dial). Appears to be running his
>>> usual +1610 and 1st and 3rd quadrant of the hour.
>>>
>>> Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2
>>>
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