[Elecraft] two k3's on the same band

[Milt -- N5IA]

Matt,

The multi-op NI5T operation in the CQ 160 contests at the N5BG station are 
done in the manner you are inquiring about.

We run THREE K3s, one running and two S&P on Topband, all three transmitting 
with full 1.5 kW output power.

Granted, we exclusively use Beverage antennas for receiving, and the 
Beverage field is at some distance from the TX antenna.

We copy stations with the S&P positions to within a few kHz of the CQing 
position.

Many times we operate in full duplex on the same freq, with one of the S&P 
positions listening on the CQ frequency in a different direction than the CQ 
position is listening.  This allows us to listen in multiple directions with 
the Beverages.

We do not and have never had any problem doing this with the K3s or with the 
lineup of FT-1000 MPs we previously used.  Never a single instance of 
receiver damage while operating in this manner the past ~13 years.

The KEY to successful in-band duplex operation is ISOLATION, either by 
polarity or physical antenna separation, or both.

YMMV, and good luck with your trial.

73 de Milt, N5IA


-----Original Message----- 
From: Matt Murphy
Sent: Wednesday, March 21, 2012 12:24 PM
To: Elecraft Reflector
Subject: [Elecraft] two k3's on the same band

Just wondering if anyone has any experience using two K3's on the same band
(for example, one for running, one for mults in a multi-op single
transmitter scenario).  Is there any danger of damaging the receiver(s) by
transmitting with high power so close by (different antenna, same
property).  Is there a difference if the transmission is a few KHz away vs
(accidentally) on the same frequency?

Just curious what sorts of precautions (if any) ought to be taken and what
solutions exist (if necessary).

73,
Matt NQ6N