[Elecraft] Using the K2 with the XV144 and an external Linear

[Don Wilhelm]

Glenn,

If your Pre-Amp relay and your linear will switch in less than 15 ms or
less, then you will not need the sequencer.

The way it works is like this - when you operate the K2 PTT, The K2 will
activate (ground) the transverter key-out and about 15 ms later RF will be
present on the antenna output.

So IF your linear and preamp relay can switch in that 15 ms time between Key
Out going to ground and the onset of RF, you will not need your sequencer.
OTOH, if your gear takes more time than 15 ms to fully switch, you will need
the sequencer.

Use of the transverter key out connector is more desirable than using the K2
PA keying output because the transverter key out signal applies only to that
transverter while the K2 PA keying output will be active with no regard to
which transverter is selected.

73,
Don W3FPR


> -----Original Message-----
>
> Hi Group,
>
> I'm presently running a K2 as an IF ( 28 Mhz ) and two Elecraft
> TRansverters...the XV50 and the XV144 ( and hopefuly the XV432 soon ??? ).
>
> I have the System hooked up using the Daisy Chain Control cable as per
> the instructions in the XV Transverter Manual. I use a Station Sequencer
> that has the Station Mic plugged into it, and PTT from the Mic actuates
> the Sequencer in the normal fashion....firstly changing over the Tx/Rx
> Relay out at the Preamp, then keying up the Linear, then the XV144 and
> finally, the K2 is keyed up. The Sequencer keys the XV144 via the Key In
> Jack ( J4 ).
>
> However, looking at the whole System and the XV50 and 144, it is
> apparent that the K2, when it has Transverters daisy chained off of it,
> keys up each Transverter as commanded from the K2, depending on what
> Transverter you select on the K2. The Transverters also have an External
> PA Key out ( J5 ). My question is this....
>
> Do I need the Sequencer...or, is the K2 smart enough in its firmware to
> key the External PA Key line first, then the XV144/50 and then itself
> via the Mic PTT on the K2 ? .....i.e does the K2 recognise that a
> Transverter Band has been selected, and key the external" Bits" before
> keying itself to prevent hot switching etc.
>
> I can see that the Ext PA Key Out ( J5) is driven from P1 on the
> Transverter, from a pin labelled " Key Out ". This appears to be
> seperate from the 8R/Key Line.
>
> If this is the case, and the " Key Out " Line that drives Q4 goes high
> before the 8R/Key line, the System already has some sequencing built in
> and my external sequencer may not be required ?
>
> Any ideas out there
>
> 73
> Glenn
> VK4TZL
>
> Happy Owner of a K2, K2/100 and XV50/XV144 Transverters...with a spare
> space for the XV432
>
>