DX-60B - VF-1 Question

[Mark S Graalman]

  I believe the neon lamp is used as a kind of
"gate" so the blocking bias has no effect unless it
exceeds about -65 to -70 volts, I would guess you
could do the same thing with a 1 watt 70 volt zener.

Mark  WB8JKR


On Thu, 20 Jul 2000 22:15:25 -0500 "T. David Cohen" <tdavid at EATEL.NET>
writes:
> I have a real Heathkit question.  I have a DX-60B and a VF-1 that I'd
> like to get on the air.  The problem, of course, is that the VF-1
> uses
> cathode keying and the DX-60B uses "grid-block" keying.  Has anyone
> made
> this combination work.  I've looked at the schematic of the HG-10
> and it
> appears that the cathode circuit of the VF-1 could be adapted but
> I'm
> not quite sure what the neon bulb in the HG-10 is for so I don't
> know
> how critical that part of the circuit is.
>
> If anyone could help, I'd certainly appreciate it.
>
> Thanks and 73s,  Dave Cohen
>
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