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Old 04-30-2011, 06:22 PM   #1
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JR Crystal Question

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I just bought a JR X-347 transmitter with a PCM FM Transmitter module. It has a 72.110 Crystal inserted in it. It came with a PCM NER-627X receiver without a crystal. My issue is that on the side of the Rx is a sticker that says "Hi Band 72.530-72.990" Will a 72.110 crystal work or do I need to replace both crystals? Anyone have "the goods"? Thanks!
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Old 04-30-2011, 09:58 PM   #2
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Re: JR Crystal Question

The earlier rx's were tuned to a range of freq as your sticker indicates. The word I got from the service techs was that you can go from Lo to Hi or Hi to Lo if you re-tune it to that specific range....how ever if you do a range test in the specified range, do another in the other range ( in your case Hi then Low) and your range test is exactly the same, it MAY BE OK. No promises.
The newer 72 mhz rx's have better design & front end tuning which allows you to use it on any 72 mhz channel. There have been several of these types of rx come up for sale as well as the "Scan Select " type which will offer crystal-less operation and auto tune to any matching JR TX. I have several and have nothing but good experiences with them.

Alternately you could look for a tx module in the 72.530-72.990 range or one of the synthesized tx modules and simply dial it to match the rx. I have one of these modules and have used it for several frequencies from "hi to lo" with solid results.

You cannot change the tx module crystal without having the module re-tuned.

Hope this helps.

JR 10X, 8103, Galaxy 8 - Spektrum DX7
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Old 05-04-2011, 09:38 AM   #3
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Re: JR Crystal Question

Thanks for all of that info. I had to read it several times to let it all sink in. I ended up picking up a matched module and receiver with crystals from Tony67. problem solved!
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