[CQ-Contest] PTT inhibit
w8ji at w8ji.com
Mon Feb 20 12:43:10 PST 2012
With the Winkeyer, you can use the PTT lines.
MFJ makes a CW keyer, the 495, than can be manually keyed and has
programmable keying delay.
DX Engineering has a sequencer that passes through PTT lines or CW with
The Winkeyer I had nothing to do with. The last two, I designed specifically
for radios that do not include a delay.
This all makes wiring complicated compared to the radio doing delay. A
better hope is that Elecraft changes firmware for the delay, because it
really is a good idea to have adjustable TX delay or inhibit that does not
alter the CW.
My antenna switch controllers are Ameritron RCS12, which lock off the
amplifier for pre-programmed times, and have internal band decoders to
prevent picking the wrong antenna. This prevents operators from damaging
----- Original Message -----
From: "Igor Sokolov" <ua9cdc at gmail.com>
To: "Tom W8JI" <w8ji at w8ji.com>; <sawyered at earthlink.net>;
<cq-contest at contesting.com>
Sent: Monday, February 20, 2012 3:08 PM
Subject: Re: [CQ-Contest] How close is too close?
> I recently ran into the same problem with not enough TX delay of K3 in PTT
> mode to use some PA and stack external switching. I wonder what work
> around do you use. Since external sequencer and total rewiring is not an
> option for my purposes (DXpedition), I plan to build additional delay into
> DB15 connector body using KEY OUT and INHIBIT signals available in the
> AUX connector of K3.
> Does it sound like a good work around?
> 73, Igor UA9CDC
>> The K3 is not without flaw either. It would be nicer if it could be made
>> softer, and have ability to have TX delay without is chopping up the
>> characters. The lack of being able to add TX delay was giving me fits
>> rising edge clicks from external switching times, until I added an
>> sequencer. It took major hardware and wiring changes to work around the
>> of being able to just slightly increase TX delay.
>> I think 1 kHz is a good target spacing, unless the rigs are better. Then
>> Hz is probably a minimum for most rigs. It should not be that way, but
>> is how it is. The lower the RX noise floor, the worse the transmitter
>> problem becomes. I imagine a MP sounds OK with S7 or louder background
>> 73 Tom
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