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Author Topic: Connecting a Icom 735 to SB200  (Read 2938 times)
KB2IUA
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« on: April 02, 2004, 11:46:19 PM »

I know I will need a keying interface, but what is the best thing to do as far as the ALC?
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W7DJM
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« Reply #1 on: April 03, 2004, 02:38:27 AM »

Regardless of the printed specs on these modern radios, I would not key ANY amplifier in  this class directly.  Many modern radios have relatively small reed relays--difficult and possibly expensive to replace.  Why take the chance?
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KB9CRY
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« Reply #2 on: April 03, 2004, 07:36:57 AM »

Check out Harbach Engineering and see if he sells a soft key kit.  That's the way to go.  Phil  KB9CRY
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KB2IUA
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« Reply #3 on: April 03, 2004, 12:12:21 PM »

I will be useing the softkey mod.  The real question is what to do with ALC.
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KB9CRY
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« Reply #4 on: April 04, 2004, 07:58:58 AM »

Send a message to Rich Measures, do a Google search, and ask him if you even need ALC.  I don't use it with my SB-220.  Phil  KB9CRY
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K4TOR
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« Reply #5 on: April 06, 2004, 07:21:26 PM »

You don't need any ALC for the powerlevel you are going to be feeding your amplifier with from a 735.
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KB2IUA
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« Reply #6 on: April 09, 2004, 06:21:28 PM »

Thank you all for the info.
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N0TONE
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« Reply #7 on: July 06, 2004, 06:36:24 PM »

The SB200 has an unregulated grid bias network that protects the grid from damage if you attempt to overdrive the amplifier.  However, it does not prevent splatter.

So, the answer is:

If you have a peak power meter, and understand how to use it to make sure you are not overdriving the amplifier, you do not need ALC.

If you do not have a peak power meter, you definitely need ALC to reduce the amount of splatter you will generate.

An SB-200 with good tubes, and a properly adjusted input circuit will deliver full power with only 40 watts of drive.  Your IC-735 can deliver 120 watts on some bands.

If this were an SB-220, the answer would be different, because to deliver full power, an SB-220 requires more power than most exciters can deliver.  Therefore, the amp cannot be driven into distortion, and ALC would not be required.
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