"tuning plates", HR-10's et al...

[Bill Coleman AA4LR]

On 3/17/98 9:29 AM, Guy G. Giacopuzzi DDS at ggg3dds at js-net.com wrote:

>Bill Coleman AA4LR wrote:
>>
>> I tried changing the crystal filter by swapping one of the crystals with
>> my brother's HR-10B (ie so I'd have two identical crystals), and
>> re-tuning the IF. Didn't work. Instead, the IF apparently got tremendous
>> feedback.

>Theorectically, if you made the crystal
>frequencies closer to each
>other, it would narrow the net "filter".  Always thought about it, but
>never tried it...

Well, that was the whole idea. I was trying to optimize the filter for
CW. The filter in the HR-10B is OK for AM reception, passible for SSB,
but way too wide for CW.

By December 1975, I bought a used SB-301. So, I only used the HR-10B for
about 9 months.



Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at radio.org
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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