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Author Topic: Alpha 87A Tune  (Read 1176 times)
WA9YSD
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Posts: 138




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« on: October 04, 2008, 08:55:32 AM »

Can some one please send me a tune up procedure Step by step for the tuning the amp for max output Alpha 87A.  Manual is minimal help.  I would like to make sure I am doing it right.  I do not want to blow the finals.
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K0BG
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Posts: 9877


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« Reply #1 on: October 04, 2008, 12:59:31 PM »

If you go to www.w8ji.com, and do just a bit of looking, you'll get your answer. It isn't any different than the manual, but it is written differently.

ALan, KØBG
www.k0bg.com
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WA5ZUP
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Posts: 39




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« Reply #2 on: October 05, 2008, 06:36:28 AM »

Join this group and ask your questions

http://groups.yahoo.com/group/Alpha87a/
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K6AER
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Posts: 3524




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« Reply #3 on: October 05, 2008, 09:39:21 AM »

This is the procedure from the manual. Tune procedure for an automatic amplifier is a bit different from a manual tune amplifier.

"
a) Select the TUNE meter function and apply about 20 watts drive at the center frequency of the segment to be programmed.
b) Use the TUNE buttons to move or “dip” the TUNE bargraph as far to the left as possible.
c) If the TUNE indicator is to the left of the desired position, press the LOAD (up) button until the indicator moves to the desired position, OR
d) If the indicator is to the right of the desired position, use the LOAD (down) button instead.
e) Repeat steps 2. and 3. above until the TUNE indicator is correctly positioned for the power level desired.

7.4 Final Touchup & Data Storage:
a) Increase drive until the RF output is about 1kW.

TUNE for maximum RF output.

b) If the grid current reaches 70mA during operation at or below the desired power, press the LOAD up button once to increase loading and then retune for maximum RF output. Repeat if necessary until peak grid current at desired output is 20-50mA."

Seems pretty simple. With a little practice it will be second nature. Just keep your grid current below 50 mA and practice your tune up at 20 watts drive until you get the hang of it.

If you are still having problems give Brad a call at Alpha.
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