[Hallicrafters] A 'possible' SX-101 spur problem?

[Philip Atchley]

Hi Y'all,

I have basically finished the work on my friends SX-101A receiver and he's 
due to pick it up tomorrow.  Yesterday I aligned and calibrated it. It was 
off some, but not "terrible".

Yesterday evening I listened to some hams on 40M for awhile, then tried out 
the 20 Meter band, though I fully expected the band to be "closed".  On 20 
Meters I was hearing a number of international broadcasters (frequencies 
unknown) that I KNOW shouldn't be there. As the 20 Meter band was basically 
"closed" these broadcasters HAD to have been on a lower band, like 25M 
(11.5-12MC) or 31M (9.5-10MC).  So, I thought that perhaps I had 
"mis-aligned" the 20 Meter band (it was the one furthest off).  So, this 
morning I rechecked the alignment and it is GOOD, RF stages peaked properly 
etc and I'm hearing quite a lot of 20 Meter ham activity "on frequency".

This one has me really puzzled as a calculation of the "Image frequencies 
(+/- 3.3MC) for this receiver doesn't add up to ANY International BCB being 
heard on 20M.

Thoughts, ideas?

73 de Phil,  KO6BB
http://users.mercednet.com/beaconeer/
Merced, Central California, 37.3N  120.48W  CM97sh

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* RECEIVERS:                                      *
*  #1. Homebrewed "Mitch Lee" Design              *
*  #2. Hallicrafters SX-71 (1955)& VLF Converter  *
* ANTENNAS:                                       *
*  #1. 20 Meter long "loaded" Sloper oriented E/W *
*  #2. Half Sized G5RV Inverted Vee oriented N/S  *
*  #3. Roof mounted Hustler 6BTV 6 band Vertical  *
*  #4. 15 Meter-band Inverted Vee oriented NE/SW  *
*                                                 *
* Number of different NDB's heard: 974            *
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