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K8NDB
07-04-2009, 11:29 AM
I am converting a Regency BTL-301 to 29.600 MHz FM. Does anyone know the crystal formulas for computing the crystal frequencies. Also, does anyone have a copy of the service manual or schematic for this radio?

Thanks!

K8NDB at yahoo dot com

K9STH
07-04-2009, 03:14 PM
If there are any existing crystals you can use them to calculate the formulas. Just divide the carrier frequency by the frequency of the crystal for the transmit formula. Multiply the receive crystal by usually 2 or 3 and then subtract that from the carrier frequency and you should get either 10.7 MHz or 455 kHz. Sometimes the receive injection is on the high side and you have to subtract the carrier frequency and should get either 10.7 MHz or 455 kHz.

Glen, K9STH

WA3EEC
07-04-2009, 05:59 PM
I remember converting one to 6M years ago (20+).

If my memory is correct, the receive crystals are 10.7 MHz above the received frequency.

The receiver was not much different from Regency Scanners. In fact, I believe the IF board was the same as the Regency Ham rigs, HR-2 and HR-6. I bet since the BTL series was marketed at the same time as the Ham Rigs, the design might essentually be the same.

Lad WA3EEC

WA2ZDY
07-04-2009, 07:28 PM
WS2L and I put a few BTL-301s on 29.6 around 1986. I took the easy way out; I got the rocks from International Crystal in OKC. They had the data for the rocks and I only had to tell them what frequency I wanted to use.

I don't work for ICM but I can't recommend any other crystal vendor; they're the best. Those rocks were on the money and ICM has a lifetime warranty.

For what were "economy grade" radios (cheap junk) those Regencies did a darn good job. The only glitch we had was only getting 15-20 watts out of them. They were rated for 30 watts.

Good luck.

K8NDB
07-07-2009, 12:22 AM
Thanks to K9STH, WA3EEC, and WA2ZDY for answering my question. I appreciate your time helping me.

73,

Jeff

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