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THE AM BULLETIN BOARD => Technical Forum => Topic started by: Ac8wp on July 08, 2019, 03:23:00 PM



Title: Ordering crystals for a rca bta-1r transmitter
Post by: Ac8wp on July 08, 2019, 03:23:00 PM
Hello all, I wanted to order crystals for a bta-1r transmitter and I was wondering if anyone knew anything about the required load capacitance ( if it has one). I know a vfo can be used instead however I wanted it to be rock bound.
Thanks
AC8WP


Title: Re: Ordering crystals for a rca bta-1r transmitter
Post by: DMOD on July 09, 2019, 08:56:26 PM
Counting the tube's input capacitance and the BTA's warping cap, it is ~ 30 pF.


Phil - AC0OB


Title: Re: Ordering crystals for a rca bta-1r transmitter
Post by: Detroit47 on July 09, 2019, 11:15:43 PM
Where are you going to order rocks from?

Johnathan N8QPC


Title: Re: Ordering crystals for a rca bta-1r transmitter
Post by: KA3EKH on July 11, 2019, 08:22:35 AM
I ordered rocks from AF4K, just used regular HC6/U for 1885 and had no issues. That was for my RCA BTA-1M.


Title: Re: Ordering crystals for a rca bta-1r transmitter
Post by: DMOD on July 11, 2019, 10:18:56 PM
If you need some rocks that Bry doesn't have, try www.quartslab.com.

Phil - AC0OB
AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands