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Old Sep 11, 2009, 09:35 PM
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gws r-4pll and jr radio not works! :(

HellÚ, i have a small problem, today i received the GWS R4-Pll in 75mhz

i have ordered the um 1 size crystal for receiver 75.550 mhz and a tx crystal in 75.550 mhz


I have a JR XR3i in 75mhz, and today i have tryed to connect but the radio and the receiver not comunicate!


where is the problem? i have tryed to insert the gws 75.550 mhz with your um1 75.550 and the original JR crystal in 75.550 in the radio but not comunicate


I have tryed to put the 4.8v in the 4/b channel and a servo in second or first channel, the servo is on but not response at the command of my jr radio


I dont know if my radio is PPM or PCM, i think ppm


I have a GWS R4-Pll wirth vertical pin FUTABA style, but the futaba style is

the problem for my jr radio? or

maybe I should take the receiver with the inscription JR STYLE?



very thanks!

Chris
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Old Sep 11, 2009, 09:43 PM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
Let me pass this thread to GWS RD team.

Some RX X'tal run at lable frequency +455Khz, but some define at -455KHz.

Yet, dual conversion will even run at -10.7Mhz!

Also, some will run at 1/2 or 1/3 tone...

Have to check X'tal chat for details.
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Old Sep 11, 2009, 10:00 PM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
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Here we have information from RD:

[10:57:31] GWS RD MARK said: R4PII must use JR type for JR PPM TX.
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Old Sep 11, 2009, 10:24 PM
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ok, the correct code of receiver is GW/R4PII75/J right?
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Old Sep 12, 2009, 11:24 AM
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Yes, the receiver is in JR shift, and it's better to use GWS Rx crystal on this R4PII, and the JR Tx crystal on the JR Transmitter.

Chen
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Old Sep 15, 2009, 05:28 PM
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DO NOT USE ANY OTHER CRYSTAL IN A TX OTHER THAN THE MANUFACTURER'S.
You may get away with it but it a very poor practice and may create some bizarre problems.

In the USA it is technically illegal by FCC rules for anyone other than a qualified technician to change transmitter crystals. Obviously, it's easy to do, just plug a new one in. But the TX needs to be tuned to the Xtal.

Best not to go there.
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Old Sep 15, 2009, 06:31 PM
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Thanks for you reply, but sorry if I use the rx gws um1 size in the rx e the jr tx crystal in the transmitter in theory i don't have problem right?

In Italy the 75mhz is illegal, but i'm not very very sure

sorry for my english,very thanks!
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Old Sep 15, 2009, 09:29 PM
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Yes, UM1 in the RX and JR crystal in the JR TX should work as long as they are on the same frequency and channel.
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Old Sep 16, 2009, 12:13 AM
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Taipei, Taiwan
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Hi Maylord & Flydiver,
Yes, that's what I replied to your post earlier. And this way does not break the rule of FCC applied in USA. I did not try to encourge someone to use the Tx crystal other than the Tx manufacturer's one, Flydiver.

Chen
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