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ejessee
Joined: 18 Apr 2009
Posts: 60
Location: Raleigh, NC
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 Posted: Mon Feb 01, 2010 5:52 pm Post subject: radio transmission problems |
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Hello all,
I have a VAL COM 760 radio in my Zenith 701 with 912 UL engine. Since I have owned the plane, I have had intermittent radio transmission problems. Some days, people I am communicating with indicate that the radio is clear. Other days, they cannot even understand what I am saying. I have been described as "garbled", "scratchy", "much background noise", and "completely unintelligible".
The radio receives perfectly.
Considering that this is an intermittent problem does anyone have an idea as to what might be my problem?
Thanks in advance for your help.
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Ernest Jessee
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Mon Feb 01, 2010 10:55 pm Post subject: Re: radio transmission problems |
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The charging system on the Rotax is fairly rough and can put out different noise depending on the state of the battery. You could check that the required 40,000 uF capacitor is present in the wiring installation.
The other possibilities are the headset, the radio itself or the quality of the antenna and cable connection. The VSWR needs checking on the range of frequencies used, typically 118 - 136.
Ralph
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Ralph - CH701 / 2200a |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue Feb 02, 2010 9:23 am Post subject: radio transmission problems |
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My best guess is you have a ground problem somewhere. Look for a loose
ground wire. If you find one make sure to remove it, clean both ends and
the area it connects to and then reinstall.
Check your plugs... If they are resistor plugs they should have about 5K Ohm
resistance in the centre conductor. I had one occurrence where a cracked
seal caused coolant to short out the resistors in my plugs. On receive the
radio was crystal clear but even a close line of sight I was nothing but
hash.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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