[Heathkit] SB301/401 question

Sat, 16 Feb 2002 07:20:19 -0500

[email protected] wrote:

>   Seems to me I remember awhile back someone saying they
> had problems with using the 301/401 combination due to the
> fact the het osc in the 301 isn't regulated and there was freq
> shift between rec and xmit, but I can't remember for sure.

  I've used my 401/300 in separate and locked modes and I never 

noticed any frequency changing, perhaps if the power (117 V. ac)
supply was soft (high impedance) this phenomenon would exist.
(one of the two reasons to regulate a supply voltage)

   If this condition exists, a 105/150 volt (possibly several
watt {heat sink?}) Zener diode and possibly additional series
dropping resistance feeding the Osc. will add regulation,
unless you are a purest)  I've done this with 0B2/OB3's
in the past, I suspect a Zener is cheaper now)

       73 (= Best Regards) de: Ron [email protected]
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