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AUX_RF vs RX_IN

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Brett Howard

AUX_RF vs RX_IN

I'm mulling something over in my head while writing some micro code on
way too little sleep... Anyway last year at FD I had some issues with
my COR in the SubRX activating when we were doing diversity receive.
Sometimes it was activating when we transmitted on our antenna and
sometimes it was activating when the other station transmitted... But
it only was doing this on the subRX as soon as you got out of
Diversity there were no issues. Not sure why we only were having COR
switching issues only on the sub as it seemed to follow the SubRX when
the antennas were switched.

My K3 was configured for the SubRX to be on the unused KRX3 port.
I've now moved it over to the AUX_RF port.... I was figuring that I'd
use an I.C.E. 196 (RF Limiter) in line with the second antenna and run
that into the AUX_RF port. That would ensure that I wouldn't
accidentally transmit through that port and what not... There is also
the added benefit that you don't have to worry about having VFO B
below that of VFO A as the LP filters are out of line on that port (if
I remember correctly). However in thinking these thoughts I figured I
could get a lot of the same stuff done using the RX_IN port..... If I
was to use the RX_IN port that gives me a lot of those benefits and I
could then move the SubRX back to the unused KANT3 port then I'm able
to transmit on that second antenna if its deemed to be beneficial to
do so in that situation (ie more flexibility)...

Still mulling things over but interested to hear thoughts of others on
this topic... Sorry for the rambling nature of this message but its
only a partially formulated thought so thats all I've got at the
moment.... ;)

~Brett (N7MG)
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Don Wilhelm-4

Re: AUX_RF vs RX_IN

Brett,

I am not certain I followed all your proposed solutions, but consult
Figure 4 on page 43 of the K3 manual to see your possibilities.
The main can use either RX IN or the KAT3 selected antenna.
The sub can share the antenna with the main, or it can connect either to
the AUX RF or to the KAT3 antenna that is NOT selected by the main RX
(the latter selection depends on how you have the KRX3 antenna TMP cable
plugged).

73,
Don W3FPR

Brett Howard wrote:

> I'm mulling something over in my head while writing some micro code on
> way too little sleep... Anyway last year at FD I had some issues with
> my COR in the SubRX activating when we were doing diversity receive.
> Sometimes it was activating when we transmitted on our antenna and
> sometimes it was activating when the other station transmitted... But
> it only was doing this on the subRX as soon as you got out of
> Diversity there were no issues. Not sure why we only were having COR
> switching issues only on the sub as it seemed to follow the SubRX when
> the antennas were switched.
>
>

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Brett Howard

Re: AUX_RF vs RX_IN

Essentially I was weighing using the AUX_RF or RX_ANT as a way to get a
no TX path into the SubRX. However...

I just went and looked at that section again... Those antenna routing
block diagrams I often forget and every time I go look at them again it
always clears up my questions...

So I guess the question of using RX_ANT or AUX_RF goes away as it
appears that the RX_ANT can not be routed to only the SUB_RX. And I
don't want to use the ANT2 port with the ICE RF Limiter on it as that
would allow the possibility of transmitting back through the RF limiter.
So it looks like it was smart that I switched over to AUX_RF mode after
FD last year (I'd probably thought this all the way through back them
and I've just since forgotten). :)

Should be interesting... I think we may actually end up having 4
antennas run into that tent and with the radio in AUX_RF connection mode
you can actually hook 4 antennas into the K3. ;)

Appreciate that prod to go back and RTFM a little closer Don.

~Brett (N7MG)

On Wed, 2010-06-09 at 20:16 -0400, Don Wilhelm wrote:

> Brett,
>
> I am not certain I followed all your proposed solutions, but consult
> Figure 4 on page 43 of the K3 manual to see your possibilities.
> The main can use either RX IN or the KAT3 selected antenna.
> The sub can share the antenna with the main, or it can connect either to
> the AUX RF or to the KAT3 antenna that is NOT selected by the main RX
> (the latter selection depends on how you have the KRX3 antenna TMP cable
> plugged).
>
> 73,
> Don W3FPR
>
> Brett Howard wrote:
> > I'm mulling something over in my head while writing some micro code on
> > way too little sleep... Anyway last year at FD I had some issues with
> > my COR in the SubRX activating when we were doing diversity receive.
> > Sometimes it was activating when we transmitted on our antenna and
> > sometimes it was activating when the other station transmitted... But
> > it only was doing this on the subRX as soon as you got out of
> > Diversity there were no issues. Not sure why we only were having COR
> > switching issues only on the sub as it seemed to follow the SubRX when
> > the antennas were switched.
> >
> >