[AMRadio] Comment from N0JEF


Brett Gazdzinski Brett.Gazdzinski at verizon.net
Wed Feb 10 21:17:59 EST 2010


Yes, a modern 200 watt radio will do about 40 watts of carrier IF you don't 
get into the alc.
Some radios (mostly older ones) could not really run much over about 10 
watts before they got into the alc which turns the carrier down.
The newer ones are better, at least the 756 pro's I had were better, good 
for about 20 watts carrier out.
If you don't have a scope, the best way to do things is look at the watt 
meter, the carrier on a 200 watt pep radio should be around 40 watts with 
about 200 watts pep.

25 or 40 watts is tough at night without a good antenna.

And, you need a very big robust amplifier to boost AM power.
A pair of 3-500z's with a heavy power supply will do 300 to 400 watts 
carrier I think.
I have four 813's at 3000 volts and can do 200 watts carrier tops.

There is also activity on 40 meters from time to time, 7290 on the east 
coast, and when there are sunspots, 50 watts does fine!

Brett




----- Original Message ----- 
From: "Robert Nickels" <ranickel at comcast.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Wednesday, February 10, 2010 9:00 PM
Subject: Re: [AMRadio] Comment from N0JEF


> On 2/10/2010 6:02 PM, kj4djf at aol.com wrote:
>>   I have a 200 watt AM transciever
>
> What type of transceiver do you have?  I'm assuming from the above that
> you probably have a modern all-mode HF transceiver that includes AM
> capability.  The good news is, many of  them can be made to sound
> terrific.  The bad news is, some are pretty fussy to get set up right,
> and if the ratio of carrier to audio isn't correct, can really sound
> awful - to the point that they are unintelligible to someone listening
> on an AM receiver.   So, just as a suggestion, I'd make sure that your
> radio is set to produce good quality AM first.   A local ham with AM
> receive capability could help you out.    The amount of RF power shown
> on the meter is not as high as you might expect, but even a good
> sounding 25 to 50 watt AM signal will get you plenty of contacts.
>
> 73, Bob W9RAN
>
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