Frank,
You still have the K3 Low Pass Filters to deal with.
The KBPF3 in the sub and the use of a separate RX antenna may produce
better results.
But then Wayne is the guy to say what other obstacles might be in the way.
73,
Don W3FPR
On 5/13/2018 7:45 PM, donov...@starpower.net wrote:
Hi Wayne,
The MARS to ham band K3 cross-band problem affects every band,
but it was extremely severe on 30 meters because the NSS assigned
frequency -- 9448 kHz -- was almost 700 kHz from our typical
10128 kHz receiving frequency.
Since switching between the K3 bandpass filters and the KBPF3
band pass filters at T/R rates isn't a workable solution, how about
this external BNC cable solution since my K3 transceivers have
KRX3 sub receivers?
If I understand the K3 internal receiver antenna switching correctly
a single external BNC jumper cable allows the K3 to transmit and
receive on VFO A on MARS frequencies and listen to any amateur
band on the sub receiver:
- Connect the RX ANT OUT connector to the RX ANT IN connector
- Tap the main RX ANT button which connects ANT 1 to the RX ANT OUT
connector and switches the input of the main receiver to the RX ANT IN
connector (connected by the external BNC cable to RX ANT OUT)
- Tap SUB to turn the sub receiver on
- Hold BSET and tap ANT to set the sub receiver input to MAIN. This
allows the subreceiver to listen on the RX ANT connected to the main
receiver.
I'm sorry I didn't think of this yesterday...
tks
73
Frank
W3LPL
----- Original Message -----
From: "Wayne Burdick" <n...@elecraft.com>
To: "Elecraft" <elecraft@mailman.qth.net>
Sent: Sunday, May 13, 2018 4:06:51 PM
Subject: Re: [Elecraft] K3 Strange Power Output Problem
I have to admit, operating SPLIT between a ham band and a MARS band that falls
outside the nearest ham-band filter isn’t something that occurred to me when
writing the firmware. But I can change the filter selection algorithm to
accommodate this case as long as a KBPF3 module is installed.
Technical details:
Since the K3/K3S is a downconversion superhet, we use very narrow ham-band
filters. One of the narrowest is the 30 meter filter.
To preserve the rig’s exceptional dynamic range, we switch the band pass
filters with relays, not diodes. This means we can’t switch filters at T/R
rates.
So to handle the case being discussed, we’d have to select the 7-10 MHz KBPF3
filter for both RX and TX.
73,
Wayne
N6KR
----
http://www.elecraft.com
On May 13, 2018, at 6:10 AM, Wes Stewart <wes_n...@triconet.org> wrote:
Another reading comprehension problem.
On 5/12/2018 1:36 PM, Mark E. Musick wrote:
Hi Ed,
You don't have a transmit problem at all. It is not an anomaly.
The amateur band starts at 10.100 MHz. You shouldn't be transmitting below that
frequency.
Hello,
I noticed this power output anomaly today while trying to work the NSS station.
My K3 was in split mode, transmitting on 10.113.5.
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