[Lowfer] 137kHz overnight

[Michael Sapp]

Garry & All:  I ran my LF/MF converter output split overnight for 630m wspr2 
and QRSS60slow from about 137775.5 to 137780.5 ish looking for XPQ, who 
announced on ON4KST chat he was running DFCW45 on 137776.  My EWE was 
pointed NW.   No sign of Lawrence's 776 signal, but VO1NA came through off 
the side reasonably well.

https://www.dropbox.com/s/7yv3dh5rw1hk0f7/capt00042.jpg?dl=0


Nice "Halloween ghosts" effect on MP with the visual gain set high...

The $20 ebay TCXO for my  FT817 (second FT-817, I have 2 of them) performed 
well and it seems like adding the foam around the TCXO and making the foam 
bootie for the nearby xtal on the main PCB of the FT-817 solved my furnace 
cycle thermal frequency drift issue. These ebay TCXO boards mount in an 
"inverted" manner compared to the stock Yeasu TCXO-9 master oscillator 
boards. That makes it more difficult to attempt to adjust the trimmer which 
is not accessible in the installed position (I did not attempt an 
adjustment) but it does allow more room for adding foam insulation during 
the install.

One other task accomplished last night was to fabricate a tine plate sheet 
metal shield for the AC switching supply for the Acer laptop that captured 
the above ARGO image. Since I have a ground system that actually takes noise 
energy to ground now, I found it well worth the effort to make grounded 
magnetic shields for the laptop switching supply and the large binocular 
type 31 chokes I use on the AC and DC cables....I have a common ground wire 
that runs from the DC cable choke shield, to the switching supply shield, 
and to the AC choke shield, and then to the shack buss bar ground.  A big 
improvement was observed in near-field noise reduction observed using the 
FT-817 and it's rubber duck antenna as an RF sniffer at LF/MF and my 
converter IF range.

73 Mike wa3tts


----- Original Message ----- 
From: "Garry and Linda Hess" <k3siw at sbcglobal.net>
To: "lowfer mailing list" <lowfer at mailman.qth.net>
Sent: Saturday, October 31, 2015 9:00 AM
Subject: Re: [Lowfer] More VO1NA in EN90xn


> Mike, thanks for the heads up on VO1NA activity on 137.777 kHz. Not much
> signal seen here, just occasional bits through the night, but around
> 0830Z it picked up enough to decode "O1NA". MP of course was potent all
> the time. Didn't notice anything around 137.779 kHz, but after VO1NA
> faded away on 137.777 kHz with local sunrise nearing (1130Z) I did
> notice something around 137.7779 kHz. Perhaps he shifted frequency or
> but more likely that was an overload spur from MP. Shortly afterward MP
> definitely begin to show +/- sidebands of 0.7 and 1.4 Hz, probably
> internal to my SDR-IQ.
>
> 73, Garry, K3SIW, EN52ta, Elgin, IL
>


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