Palomar 450hd

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iv1982
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Palomar 450hd

Post by iv1982 » Thursday 12th Apr 2007, 0:43

Hi i have a palomar 450 hd and when i turn it on and talk my meter seems to swing backwards a little. Is this a tuning proplem. With it off my meter swing forward all the way when i talk!

kc8mob
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Post by kc8mob » Wednesday 18th Apr 2007, 6:46

I take it you are referring to the meter on your radio.

1st, for you to ever see it swing backwards, no matter how bad the mismatch, you are keying too much. Back off the carrier if you can.

This is also a tell tale sign that the impedance of the amplifiers input is not tuned to the output impedance of the radio (Mismatch)

They quote those amps as high drive. They're not really that high of drive. 2 watts carrier and then forward power with modulation.

Again, modulation is the information you are putting not the complex wave (Radio wave) it is not the fact that the power increases while you talk. The system is operating at a lower duty cycle, until modulation (voice) is applied. That's why you see more output when you talk.
The duty cycle is increased.

iv1982
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Post by iv1982 » Thursday 19th Apr 2007, 1:34

ok...well my radio dead keys at about 10watts, so are u saying i should turn it down to 2 watts? if so is this somthing i can do myself and if this is done will i be able to getout any better?

Thanks

kc8mob
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Post by kc8mob » Thursday 19th Apr 2007, 12:33

Yea, don't key 10 watts into your linear. If you do, you'll be romeing around the hamfest shouting

Show me the linears!

Turn down your carrier. I take it you have an export. If so adjusting the carrier will be really easy.

You have more audio if your carrier is lower. Generally.

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Min
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Post by Min » Tuesday 6th Nov 2007, 0:06

iv1982, what model radio do you have and what #number is the board?
Give more info and people will try to help as much as then can.
10 watts dead key is way to much, I`d probably use about 1 1/2 watts of power and let the modulation swing. From reading on here, if you load the amp with to much radio power you can damage the amp.

hotshot
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Post by hotshot » Wednesday 7th Nov 2007, 7:56

you have a bad lead from amp to radio
you will always miss the shot you don't take.

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