Some HW-16 problems...

Brian Carling bry at MNSINC.COM
Wed Oct 1 09:52:22 EDT 1997

Ken, I wonder how many crystals have you tried?

THis MAY be due to a rock that is just reluctant to start, or perhaps
even the TYPE of rock may require a different parallel capacitance.
Most are rated for 32 pF but some require a different value.
You might try using atrimmer cap of say 50 pF for the rock and
then adjusting it for the best note. That will often correct chirp
problems with xtal oscillators.

The other possibility is an RF feedback that is somehow getting back
into the crystal but not affecting the VFO.

Keep us posted on the progress, OM!

On 30 Sep 97 at 17:05, Ken wrote:

> Picked up a basket-case HW-16 about a year ago. When I got it working the
> FIRST time, it chirped with crystals, but not with an external VFO (VF-1),
> and had a T-5 note on 80.
> One or more of the filter caps shorted one day and took out two of the
> "filter" resistors in the filter string, so I replaced the caps with
> Nichicon 470 ufd @ 450 vdc, the resistors with a 6 Hy filter choke,
> and installed two VR-150s. Rewired the tx osc. stage to put regulated 150
> vdc on the screen and regulated 300 vdc on the plate, and, while I was at
> it, used regulated voltages for all the receiver except the audio amp
> plate.
> Still chirps with crystals, but the note on 80 is now T-9 and it puts out
> nearly 50 watts on all three bands.
> Anyone have any really bright ideas concerning how to stop the chirp
> without eliminating the QSK (such as it is)?
> I also had to parallel the 150 pfd cap (which is switched across the final
> tuning cap for 80) with another 12 pfd to get the final to tune at the low
> end of 80.
> Ken W7EKB
*** 73 from Radio AF4K/G3XLQ Gaithersburg, MD USA  *
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