[ARC5] More BC-455 IF thoughts

[Glenn Little WB4UIV]

If there are swamping resistors across the if coils, remove them.
This will narrow the IF.
Stagger tuning will widen the IF.

73
Glenn
WB4UIV

On 4/13/2018 10:15 PM, J Mcvey via ARC5 wrote:
> Well , the BC-455 that I THOUGHT had all three IFs changed to 85Khz 
> wasn't that .
> The 1'st IF numbers were faded so I ASS-u-med that they were all the 
> same. Unfortunaely, only the 2nd and 3rd IF were 85Khz , The ist IF 
> tuned out to be the original, thus all of the heavy mods were about a 
> second oscillator which he must have removed the Xtal or whatever, as 
> there was no sign of a secondary osc circuit coil either.
>
> Anyway, I was wondering if stagger tunning the IFs might be a way to 
> narrow the BW on the cheap?
> For instance 1st IF tuned at 2830 , 2nd tuned in the LSB of the first 
> IF and the 3rd IF tuned in the LSB of the 2nd.
> AM might sound funky, but LSB and CW should be a lot more selective, no?
>
>
>
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

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