Can you send along a schematic?
Chuck, KE9UW
c-hawley@uiuc.edu
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of Douglas
> Sent: Thursday, October 14, 2004 0:19 AM
> To: tentec@contesting.com
> Subject: [TenTec] Hercules 444
>
>
>
>
> I got a Hercules 444 linear that actually works with
> one minor problem. Fortunately, the finals have not
> yet blown (knock on wood).
>
> The K2 relay that bypasses the receive antenna isn't
> working.
>
> The relay itself tests fine with 12 volts applied.
> The relay driver line only has about 1.5 volts out of
> the control pcb. All components on the control pcb
> have been checked or replaced. There seems to be
> excessive voltage drop across R1 (50 ohm) resistor on
> the control pcb and/or the voltage drop across Q1 is
> excessive.
>
> Ten-Tec's explanation for the operation of this
> circuit makes no sense to me. Both K1 and K2 are
> listed as having N.O. contacts. Both are driven by the
> same voltage derived from Q1 on the control PCB, thru
> separate dropping resistors. Yet, the manual states
> that when K1 is open, K2 is closed and vice versa.
>
> Anyone out there familiar with this circuit?
>
> tnx,
>
> Doug/WA1TUT
>
>
>
>
>
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