[Elecraft] PTT question

[Jim Wiley]

Jim -

Make sure your preamp(s) do not have internal electrolytic power 
filtering caps.  If they do, there is a fair chance the caps may hold 
the preamp on long enough for it to suffer damage.   But, I am wondering 
why you are using preamps at HF at all?  Unless the feedlines are 
extraordinarily long _and_ you are talking 15 or 10 meters.  We use a 
NCC-1 here with the main and "sense" antennas 200 or 300 feet from the 
shack, on 160, 80, and 40 meters, with no problems.  Careful use of the 
NCC-1's internal adjustable attenuators has solved any gain differential 
issues so far.

- Jim, KL7CC

On 1/24/2015 1:17 PM, Jim Miller wrote:
> I'm getting ready to add a RX array which includes remote preamps and an
> NCC-1 phasing unit.
>
> I'm planning on sending PTT to the NCC-1 which will in turn kill power to
> the preamps. As I understand the manual upon key down the PTT line goes
> active immediately followed by a default 8ms delay before RF.
>
> Is that correct? The unstated part in the manual is that PTT is immediate
> with key down.
>
> If that is correct then that will satisfy the 5ms requirement of the
> preamps.
>
> Thanks
>
> Jim ab3cv
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