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Author Topic: Wouxon HT transmit deviation settings.  (Read 2267 times)
VA6SGI
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Posts: 6




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« on: December 27, 2011, 03:04:14 PM »

Hi Folks,

I've noticed that in the programing software (and on the radio itself) I am able to adjust the transmit deviation to either narrow or wide.  When operating on the 2m and 70cm bands how should I have this set?

According to the (poor) documentation that comes with the radio the WIDE setting is 25kHz and NARROW is 12.5kHz.

Any insight would be appreciated.
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KB2VUQ
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Posts: 117


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« Reply #1 on: December 28, 2011, 07:42:25 AM »

Wide is +/- 5 khz deviation, Narrow is +/- 2.5 khz. I can't tell you what is "normal" in your area, but most amateur stuff in the US is Wide.
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LB5KE
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Posts: 141




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« Reply #2 on: December 28, 2011, 07:37:57 PM »

Most Small band FM has now moved from 25kHz to 12,5kHz FM bandwith. Remember we are talking about bandwith her, not deviation. However if we are using a bandwith of 12.5kHz the channel separation should also be 12.5 kHz or larger.

So lets say you are transmitting at 440.100 with 12.5kHz you are occupying 12.5kHz bandwith so you are using 440.100 MHz - 6.25kHz and 440.100 + 6.25kHz and if someone is talking in the channel above you they have to be 12.5 kHz higher because they are occupying 444.1125 -6.25kHz and 444.1125kHz + 6.25kHz. 

The max deviation is because if more channels should be packed in less space (12.5kHz narrow) the transmitter must transmit as accurate as possible on the frequency that are being used, to avoid collition. 25kHz FM bandwith has a little better voice quality, but the smaller 12.5kHz increases receiver sensitivity, so you will improve the working range a little.

If your radio is set to narrow, you are still able to talk with a station that uses 25kHz wide, however you will sound a little undermodulated, speaking loud and closer to the mic helps. Also check out if there is a repeater that you uses often, if it is tuned to be used for 25kHz, then you might want to use the wide setting.
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VA6SGI
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« Reply #3 on: December 29, 2011, 02:24:59 PM »

Thank you for the information, that clears things up.
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