[Elecraft] (K3) RX bandpass - shift/width vs low cut/high cut

[Dave]

Hi All,

I like to run around 3.2 wide rx when band conditions permit. I noticed I 
can get much more low frequency response when using the shift/width controls 
vs low & high cut.

With Low & High cut seems even with low at 0 the low frequency starts around 
100 to 150 Hz. I haven't pulled out the test equipment to verify but can 
definitely tell by ear it is nowhere near zero Hz.

Using Shift/width and setting shift to 1.45 and width to 3.2 I can get very 
nice lows & highs. Tested with 13 Khz, 6 kHz and 2.8 kHz filters (yes I know 
the 2.8 would restrict the dsp bandwidth even further).

Can this be something in IF filter alignment? Using the following filters, 
13 Khz, 6 kHz, 2.8 kHz, 400 Hz.
All filters set to zero Hz in config.

Thanks
Dave
wo2x


-----Original Message----- 
From: Fred Townsend
Sent: Friday, June 08, 2012 4:23 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] OT: Free to a Good Home- Teletype Manuals

These are mostly depot level Teletype and Facsimile WWII and Korean War era
originals. A sampling:



1.       Technical Manual Model 35 ASR

2.       Teletype Parts List (Includes schematics) circa 1942

3.       Teletype High Speed Punch Set circa 1965

4.       Teletype TD TT-187/UG circa 1963

5.       Signal Data Recorder RD-231 circa 1965



Please contact offline. Arrange to pick-up or FOB San Jose, CA. I will ship
USPS library rate if you send the stamps.



Fred, AE6QL





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