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Author Topic: Power Output problem with my Ft-7100M  (Read 338 times)
KD5MNB
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« on: December 09, 2004, 12:55:38 PM »

I had my radio tested at the last Ham Fest I was at and my radio is only putting out 35W on 2 meters and 10W out on 70cm.  Has anyone ever came across this and if so, what did you do to fix it besides sending it back to Yaesu??

Thanks for your help,
Keith
KD5MNB
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K0BG
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« Reply #1 on: December 09, 2004, 02:09:25 PM »

I don't know what it is suppose to put out, but I'd bet who ever measured it for you didn't have adequate equipment. What is needed is a known good dummy load (not an antenna!), and a good Bird wattmeter or one similar with at least 5% full-scale accuracy.

In any case, there are internal adjustments for the power. Frankly, I wouldn't worry about it. Even if you doubled the power out, the increase in performance wouldn't be discernible.

Alan, KØBG
www.k0bg.com
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KD5MNB
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« Reply #2 on: December 10, 2004, 05:28:06 AM »

I measured it last night and it is putting out 40 watts on 2 meters and 35 watts on 70cm.  I have ordered an amplifier from HRO.  Can you tell me where the internal power adjustments are??  I would like to get it back to its original pwr output of 50 watts or close to it.  Thanks for your help.

KD5MNB
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K0BG
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« Reply #3 on: December 10, 2004, 06:03:20 AM »

Jim, there's a little more to this story. ANY solid state RF amplifier (final) is highly dependent on what the input voltage is. For example, at 13.8 volts, an Icom IC706 will deliver 100 watts out. At 12 volts the output is about 75 to 80 watts. It is indeed possible to adjust the final drive to make up for some of the loss. However, doing so will increase the IMD well above the minimum acceptable level. With out knowing EXACTLY what setup you are using to measure the output, I wouldn't suggest you mess with the controls.

Aside from this, I suspect the controls are in the owners manual, and they are certainly in the maintenance manual. If you don't have them, the are available from Yaesu's parts department.

Alan, KØBG
www.k0bg.com
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