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Author Topic: AM problem w/ Icom 718  (Read 733 times)
KC9GPJ
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Posts: 37




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« on: May 31, 2007, 09:30:44 AM »

My AM on my icom 718 is distorted. I tried adjusting the am carrier knob inside the radio, but nothing has changed. Is mic gain different on AM, is the ALC similiar to SSB? Im was thinking that Im proibably clipping, but to adjust the ALC correctly I have to to turn the gain down very very low....is that normal?......i guess i just need to try getting some on air signal reports.
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N4JOY
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Posts: 26




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« Reply #1 on: May 31, 2007, 10:22:01 AM »

Hi -- My first attempt at AM was with my Icom IC-751.  I simply switched to ALC and adjusted my mic gain down until the needle just flicked off zero on voice peaks.  Using an SM-6 microphone, I received excellent audio reports - a few were suprised that I wasn't using a boatanchor.  I assume this is the same for your 718.  When properly adjusted, you'll be surprised how nice some of the newer rigs sound on AM!

Chris, N4JOY
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KC9GPJ
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Posts: 37




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« Reply #2 on: May 31, 2007, 11:27:18 AM »

I'm guessing im getting out just fine now, but I haven't had anyone come back to me, so im not sure how im sounding. 14.286 a good freq?
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N4JOY
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« Reply #3 on: May 31, 2007, 11:48:09 AM »

From my experience, most of the AM activity is on 10 (when band conditions cooperate) and 40.  When 10 is open, I call CQ around 29.000 MHz to 29.200 MHz.  I personally haven't heard any AM activity on 14.286 in quite some time.  There are some AM nets on 80 meters as well.

Chris, N4JOY
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KC9GPJ
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Posts: 37




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« Reply #4 on: May 31, 2007, 12:14:06 PM »

ok thanks
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WB2WIK
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« Reply #5 on: June 01, 2007, 09:34:38 AM »

Adjusting stuff inside the radio is *usually* a bad idea, and presupposes the factory made a mistake, which is unlikely.

To operate the IC-718 or *any* 100W output solid-state multimode transceiver for AM operation, normally all you need to do is turn the power output level down to 25.00 Watts (measured on something of known accuracy), the adjust mike gain until it sounds good, and you're done.

The IC-718 -- nor any other common 100W PEP rig -- cannot run more than 25W carrier power on AM.  I see some user guides suggest setting carrier power for 40 Watts, which makes no sense, since for 100W PEP that would restrict modulation to only about 60%.  If you want full modulation (100%), you must start out with a carrier of 25W, so that on voice peaks you'll achieve 100W PEP and full modulation.

I rarely hear AM activity on 20 meters, though.  There's a LOT more AM on 75m and 160m than on 40 through 15.  There's a lot of AM above 29.0 MHz on ten meters, but first you need some propagation...

WB2WIK/6
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KB9CRY
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« Reply #6 on: June 01, 2007, 01:27:39 PM »

Try SSB mode
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