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Thread: UHF Output Power (Uniden UH7700NB)

  1. #1
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    UHF Output Power (Uniden UH7700NB)

    I was recently told (by someone who I later found out was a bit of a gob****e) that my UHF Radio wasn't working properly. I'd not found that I had problems with it before - people could hear me and I could hear them - but decided to get a power and SWR meter to check my set up.

    According to the meter, my power output was 3.6 Watts and my SWR was 1.0. No real problem there as far as I can see but is the 3.6 Watt output right? The specification for the Uniden UH7700NB say its output is 5 Watts.

    Where have the missing 1.4 Watts gone? Is the output one of these 'nominal' values like car engine sizes (like the 3.9L V8 being called a 4.0L?)
    2012 Discovery 4 SDV6 HSE
    2003 Discovery 2 TD5
    2003 Defender Xtreme
    1997 Discovery V8i

  2. #2
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    Quote Originally Posted by sam_d View Post
    I was recently told (by someone who I later found out was a bit of a gob****e) that my UHF Radio wasn't working properly. I'd not found that I had problems with it before - people could hear me and I could hear them - but decided to get a power and SWR meter to check my set up.

    According to the meter, my power output was 3.6 Watts and my SWR was 1.0. No real problem there as far as I can see but is the 3.6 Watt output right? The specification for the Uniden UH7700NB say its output is 5 Watts.

    Where have the missing 1.4 Watts gone? Is the output one of these 'nominal' values like car engine sizes (like the 3.9L V8 being called a 4.0L?)
    If you can listen and send and your range is satisfactory then there is nothing wrong with your radio, I am pretty sure that the quoted 5W is the Maximum .
    You only get one shot at life, Aim well

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  3. #3
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    You should get a full 5w with 1:1 SWR. There is probably an adjustment in the radio somewhere.
    If you can hear and be heard don't worry about it.
    It is just the usual consumer product - the purchaser is the quality control.
    Terry
    80 109" 2.6 P ex Army GS, saved from the scrappie.
    95 300tdi 130 Single cab tray.
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  4. #4
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    I bet the person who told you this has a 40channel UHF CB.

    40 Channel radios receive 80 channel radios at half the volume of other 40 channel radios.

    80 channel radios have circuitry that equalizes 40 and 80 channel radios.

    So tell the bloke who told you rubbish just to turn his volume up and get with the program and buy an 80 channel.

    Regards Philip A.

  5. #5
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    Quote Originally Posted by PhilipA View Post
    I bet the person who told you this has a 40channel UHF CB.

    40 Channel radios receive 80 channel radios at half the volume of other 40 channel radios.

    80 channel radios have circuitry that equalizes 40 and 80 channel radios.

    So tell the bloke who told you rubbish just to turn his volume up and get with the program and buy an 80 channel.

    Regards Philip A.
    It's a bit too late for that. This was about two months ago. The reason he said that my UHF was was faulty was that when he was setting it up duplex mode while on his property to camp, he didn't hear the small bit of interference (or whatever you call the brief 'crackle') when transmitting and getting the signal repeated.

    First thing he said was that my antenna mustn't be connected. I queried this as I'd never seemed to have a problem with transmitting before and I could receive without issue. He then told me that I can receive just as well without an antenna as with. By now I was suspecting he was talking out of his arse.

    However, just in case he was right I checked to see if there was any problem with the coax by doing a simple circuit & resistance test and found now problem but got the SWR meter to test things properly and have yet found no problem.

    The thing that has confirmed to me that the guy was a gob****e was the fact that my UHF doesn't appear to have a problem and that his description of a "spacious camp site on the beach" was a tiny spot on the road to the beach that barely big enough to fit my tent on with no privacy and stinking of stale ****.

    Anyway, the main reason for this question was wondering why I'm getting 3.6 Watts output, not the 5 as the specs say. I can't find anything to say this is normal or a problem.
    2012 Discovery 4 SDV6 HSE
    2003 Discovery 2 TD5
    2003 Defender Xtreme
    1997 Discovery V8i

  6. #6
    DiscoMick Guest
    Might be a silly question, if so apologise in advance, but I assume you've checked the power supply to the radio is all OK?

  7. #7
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    I wouldn't worry about it. I am a Ham radio operator and my maximum power is 100Watts. However the gauges never show full power. There are losses everywhere, coax fittings, the cable. Even the test gear introduces losses.
    Jim VK2MAD
    -------------------------
    '17 Isuzu D-Max

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