[Elecraft] K4 full duplex?

[Edward R Cole]

Joe,

The link you supplied was not available when I wrote my reply last 
night (in Alaska 4 hours behind EDST).
That label is encouraging.

Since the basic K4 model has two direct conversion receivers perhaps 
one can operate in duplex on a separate antenna.  Would depend on 
separate DSP and audio cktry being present.

The announcement refers to addition of VHF/UHF module (which I take 
to be internal to the radio cabinet unlike current XV series).

Ref is likely the same EXREF module added to the synth as in the 
K3&K3s.  Overall freq stability will depend on the TCXO like it is in 
the current K3/K3s if that is true.

I hope provision is made for export of baseband IQ from both Rx.  I 
take both main-IF and sub-IF from my K3 to two LP-Pan locked to the 
same LO to make use of dual-polarity diversity reception on 
2m-eme.  Being able to run special sw using IQ input from the K4 
would set it apart from most other radios.

I am not planning to buy a K4 during the initial roll out.  I would 
wait for the kit version K4D.

I have a venerable basic FT-736R that will do 144/432 duplex for the 
current crop of satellites.  Their is work on a geosta 5/10 GHz 
hamsat that would use digital modulation and require a special 
transceiver (that is beyond any current satellite radio).  Issue with 
such is finding  cheap launch.

So quite happy with my upgraded K3 and KX3 (for now).

73, Ed - KL7UW

On 2019-05-17 11:43 AM, Edward R Cole wrote:
  > I suspect not because only one ANT connector is designated VHF/UHF.

Look more carefully ... it appears that the XVTR IF IN jack is also
marked "V/U ANT 2".  Might be enough to allow duplex on 144/432.

In addition, the rear panel marking does not designate ANT 4 as
VHF/UHF only so perhaps a software upgrade will allow use of other
antenna jacks for VHF/UHF.

<https://swling.com/blog/1c279a0e-ee1e-478f-8505-5fce675fb70a/>

73,

     ... Joe, W4TV


73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   dubususa at gmail.com