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JR 8103 FM Air Tx -> how HOT is your module?

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Old 10-07-2003, 01:48 AM
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Kaoma
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Default JR 8103 FM Air Tx -> how HOT is your module?

On my JR 8103 FM Tx radio, the module gets pretty hot. Is this normal? I have done some testings with different antennas and here are the results:
- stock telescopic antenna 30 min. run, just sitting -> 101F
- stock telescopic antenna 30 min. run, flying -> 103F
- JR base loaded antenna with adaptor 30 min. run just siting -> 104F
- JR base loaded antenna with adaptor 30 min. flying -> 105F

In each case the antennas were fully extended. Have left the radio cool down to room temperature (77.8F) between tests. Have used a laser temp gun and an infrared temp gun (with identical readings) pointed at the "PCM" logo on the back of the module at a distance of about 3 in.
Are those temps normal or is only my radio??? The radioo is 1 month old with only about 6-7 hrs. of flight time.
I would appreciate if you would check the temp of your radio and post it here. Thanks.
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Old 10-07-2003, 09:27 AM
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Default RE: JR 8103 FM Air Tx -> how HOT is your module?

I have never noticed the module in my 8103 being hot. If I did, I would send it in to Horizon to check out!
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Old 10-08-2003, 12:42 PM
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mr.rc-cam
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Default RE: JR 8103 FM Air Tx -> how HOT is your module?

Test performed today for you -- JR XP783 with NET72P RF module:

Ref Ambient: 77ºF
05 minutes : 88ºF
10 minutes : 94ºF
20 minutes : 100ºF
30 minutes : 101ºF

At 101ºF the module is barely warm to the touch. Please keep in mind that the RF output used in the various countries varies, so the heat generated in the RF PA can vary too.
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Old 10-08-2003, 05:19 PM
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Default RE: JR 8103 FM Air Tx -> how HOT is your module?

Thank you "mr.rc". I see that out temps matched for 30 min. test at 101F. I know that using the Base Loaded Antenna from JR, the module will be hotter a bit compard to the stock telescopic antenna. I have also went to the field and checked other people's module and the temps matched 99% of the time. To me it feels HOT but I get this is normal.
I have talked to the guy from LHS I have bought the radio and he said his radio is the same and used it for more than 6 yrs. with no problems.

Thanks again.
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Old 10-09-2003, 09:51 PM
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Default RE: JR 8103 FM Air Tx -> how HOT is your module?

I have the 3810 and it gets warm to the touch after being on for a while (30 min maybe) When I first noticed it I was a bit worried but most other 3810's I have seen do the same thing.
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