SB-401 question

[Dennis Norton]

Hi Mark--My manual (which is later) shows the 21 mhz trap to be 3.5
microhenry. The trap is removed when the 401 is used with a 303, but left in
circuit when used with a 301. My manual is a newer version since it
references using the 401 with a 303. For the 8.6mhz trap, my manual says to
remove the crystal in question from the 303--but that is only in the section
under alignment as a transceiver. When aligned as a stand alone with the
crystal pack, the crystal is to be removed from the transmitter. You remove
whichever het osc crystal is the one doing the work (depends on which
position the locked / unlocked switch is in)  Hope that helps......Dennis
Norton  W2DJN

----- Original Message -----
From: Mark Graalman WB8JKR <wb8jkr at JUNO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, May 30, 2001 2:09 AM
Subject: SB-401 question


>   I've got a couple questions for any SB-401 guru's
> out there.
>
>   I recently picked up a SB-401 to basically restore and
> found first off on the Mixer/Bandpass circuit board there
> is supposed to be a 21 Mhz trap, this trap is a series trap
> to ground consisting of a inductor (#40-479) which is spec'd
> as 3.5 uh, and the capacitor is a 180 pf mica, in the unit I have
> this inductor is missing. My question is, is this inductor actually
> a 3.5 uh or is it .35 uh, a .35 uh will resonate with 180 pf at about
> 20 Mhz, 3.5 uh is WAY too high!!! I'm thinking this may be a
> misprint in the manual. Also don't understand the purpose of it,
> it would only guard against the 4 th harmonic of the LMO output,
> which seems unlikely anyway.
>
>  Another question, under the alignment with the accessory
> crystal pack installed (stand-alone-transmitter) on page 101,
> under the 8.6 Mhz trap adjustment it tells you to remove the
> 15.895 crystal from the SB-301 receiver, needless to say if
> I'm doing this alignment there may very well be no SB-301
> receiver, so are they actually talking about removing the
> 15.895 Mhz crystal from the SB-401 and its a misprint?
>
>
>  73 Mark WB8JKR
>
> Novice 3/71, General 8/72, Advanced 6/80, Extra 8/88
> Member Society of Cable Telecommunication Engineers
> Member ARRL, DXCC, WAC, WAS, VUCC 2 meters, GJDXCC, OTC, RCC
>
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