[R-390] SAQ in CT

[Scott Bauer]

 I have a TV that uses a circuit to keep the picture tube warm. It 
creates hash up and down
most of the spectrum.To make it worse, it moves. I use a switched outlet 
to stop the noise.

 Scott W3V

Jay Rusgrove wrote:
> Bill
>
> There could be any number of sources of the noise. One big problem at LF is electrical noise
> generated in the house which is conducted out the feedline to the antenna and then returns to the
> receiver. This can be greatly reduced or eliminated with a ferrite transformer with primary and
> secondary windings on opposite sides of the core (not bifilar wound). I use 46 turns for both the
> primary and secondary on an FT-114-77 cores and keep the turns separated about a quarter inch.
>
> This fix can't be used with an active antenna that must be supplied voltage via the coax. At this
> location I'm unable to use active antennas (both loops and e probes) at LF for that reason -
> although I can use them at other locations which are away from electrical noise sources.
>
> The HP 3586C (and maybe the B as well) has a bfo pitch of 1850 Hz and is not adjustable. That means
> you would have to tune the receiver to 18450 to get a beat note of 600 Hz when receiving 17200. The
> receiver must be set to 3100 Hz bandwidth. Narrow band filtering can then be done with an external
> audio filter or done in software. Despite this complexity in setup it makes an excellent receiver.
>
> Jay W1VD
>
> ----- Original Message ----- 
> From: "bill riches" <bill.riches at verizon.net>
> To: "'Jay Rusgrove'" <JRusgrove at comcast.net>; <r-390 at mailman.qth.net>
> Sent: Monday, December 24, 2007 11:56 AM
> Subject: RE: [R-390] SAQ in CT
>
>
>   
>> Good Job Jay,
>>
>> I could not hear it - using 3586b, wellbrook loop and a K9AY loop.  When I
>> have the 3586 tuned to 17.2, noise demod, entry fx = carrier, upper side
>> band I am receiving a buzz saw with a sig strength of - 67 dbm on the
>> Wellbrook. It zero beats about 18.0 khz.  Any idea where this racket is
>> coming from. I get a 15 db null at 120/300 degrees.
>>
>> 73,
>>
>> Bill, WA2DVU
>> Cape May, NJ
>>
>>
>> 12/24/07
>>
>> Good reception of SAQ this morning. Signals were at their best during the
>> pre-session tuneup, unfortunately IDs were few and far between. A clip of
>> the pre-session with alternator coming up to frequency:
>>
>>  http://www.w1vd.com/SAQ122407A1A.wav
>>
>> ID at end of first session:
>>
>> http://www.w1vd.com/SAQ122407A1B.wav
>>
>> Conditions:
>>
>> 35 F Clear, low static levels
>> Antenna: 14 turn 10' Octoloop
>> Receiver: HP3586C SLM
>> Filtering: Cooledit
>> Report: ~439
>>
>> Jay Rusgrove W1VD
>> Burlington CT USA
>>
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