[Elecraft] PTT question

[Jim Miller]

These are short verticals. HI-Z AL24. 

I'll ask about turnoff delay when I call DXE tomorrow. 

73

Jim ab3cv


On Jan 24, 2015, at 5:43 PM, Jim Wiley <jwiley at gci.net> wrote:

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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