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Author Topic: sb-200 soft key  (Read 1244 times)
AE7VA
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Posts: 41




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« on: December 19, 2012, 06:20:42 AM »

I just got a sb-200 without the soft key modification.  My foot pedal has a separate line to key the amp first before keying the transceiver.  If the alc is the only connection to transceiver in my case, do I even need the modification if tx/rx activation isn't coming from the transmitter?
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KA5N
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Posts: 4380




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« Reply #1 on: December 19, 2012, 06:48:47 AM »

If you are keying the amp with a foot switch, you don't need a softkey.  You must be
sure not to "HOT KEY" the amp.  However the softkey is a simple device that allows
the transceiver to key the amp without any danger to the transceiver's keying circuit.
(the keying circuit of the amp requires quite a bit of current). 
Also with most modern transceivers you don't even need an external ALC since the
output is set by a control and the transceiver has a circuit to prevent overshoot or
spikes etc.  (i.e. its own ALC).

Allen  KA5N
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AE7VA
Member

Posts: 41




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« Reply #2 on: December 19, 2012, 11:38:26 AM »

I assume that hot key means keying the transceiver before the amp.  My foot switch is designed to key the amp prior to the transceiver so I should be okay.
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KA5N
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Posts: 4380




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« Reply #3 on: December 19, 2012, 12:36:56 PM »

You are correct and should be ok.

Allen KA5N
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