>
>> >Hello everyone, I just got a SB-200 for my Elecraft K2/100
>> transceiver. Can
>> >anyone tell me what I need to do to make this amp work on my
>> transceiver?
>> >Also, what mods are "must have" for the SB-200
>>
>> If I bought a SB-200, I would:
>> 1. Change it from negative-V RL-Control to positive.
>> 2. Remove the cockamamie, not-standard R/T bias arrangement and orig
>> relay.
>> 3. Add the high-speed switching mod so it won't hotswitch with modern
>> transceivers.(c.$60)
>> 4. Use the orig relay to add stepstart. (c. $4)
>> 5. If new 572Bs are to be installed, improve VHF stability. (c.$13)
>> >
>
>Agreed. Before I got the SB-220 I owned an SB-200. I looked at AG6K's QSK
>mod for the SB-220 and modified the SB-200 to use it. With the Matsushita
>relay for input switching and the Jennings RJ-1A for output switching
>there's just nothing like it. It's so quiet you'll wonder why you ever put
>up with the old clunky relay.
Amen, Doug.
>There's a handwritten schematic at:
>
>http://64.40.84.76/doug/misc_stuff/sb200_s.jpg
>and a higher resolution scan at:
>http://64.40.84.76/doug/misc_stuff/sb200.jpg
>
>I don't show all the SB-200 details, just the stuff that differs from the
>SB-220. You should start by reading the SB-220 QSK writeup at AG6K's site. I
>didn't use electronic bias switching, and I didn't convert to a positive
>relay control voltage, but if your rig has a noisy keying relay or one that
>can't handle the voltage then you probably should.
Keying relays are too slow for high-speed switching.
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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