>
>measures wrote:
>
>> Don't use a relay. A npn transistor does a faster switch than a relay.
>> See Figure 7 on my Web site. See article on TS-440 circuit improvements.
>>
>
>I don't see the need for a a modification to the FT-1000D circuit board,
>when a simple re-flowing of solder joints and/or cleaning of the relay switch
>contacts will cure the problem. The relay in the FT-1000 is quite fast
enough for the
>alpha 87,
>and I have never had a problem with hot switching in 5 years that could be
>traced to
>the relay itself.
As I see it, the problem is that the FT-1000 delivers RF 5mS after PTT or
VOX closure - so if the RL control relay in the radio isn't faster,
hotswitching results. . Conventional relays are simply too slow. ....
- like 10 - 15 mS. Switch transistors are much faster, less costly,
more reliable, and make no noise. .
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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