[Elecraft] K3 Rx antenna

Sun Feb 2 02:05:04 EST 2014

Hi there Paul,

Mike K2MK mentioned that & Joe, W4TV along the same line. I made up 
the pieces today and did as was suggested. Indeed this is exactly 
what I wanted to do with the K3 & the directional Rx antenna, mission 
accomplished. Now I can null out offending stations sometimes to the 
point of really not hearing them to a level that is bothersome. 

There were some SOBs intentionally QRMing FT5ZM on 160 and while I 
didn't work him there I was able to null some of the QRM to the point 
I could hear him. On diversity I still heard the QRMers over his 
signal. (What unhappy people those QRMers must be to live every day 
with that defect in their thoughts, but I digress) In the absence of 
intentional QRM I would have been able to have heard them marvelously 
with diversity.

My concern with the dB loss is only when it comes to the faintest of 
stations which is what I like to work, I like the most difficult ones 
to pull out because they are the most interesting ones to me; DX, QRP 
or someone with a really compromised location, that gives me the 
greatest pleasure and when such signals are in the mud, 3 dB is a lot 
of loss. When copying a signal that moves the meter the loss is no 
problem. All these options to select what antenna configuration to 
use with the K3 & its sub receiver are tools each has unique benefits 
& liabilities, sometimes a different choice lets me make the Q.

Thanks to everyone who replied.

73,

Gary
KA1J

> Hi Gary,
> 
> I also have the Hi-Z triangle array and K3. I use a splitter to feed 
> the receive antenna to the Aux-In and RX-In ports.
> 
> About your concern of the 3 db loss when using a splitter -- is this 
> really a problem since you are reducing both the noise and the signal 
> by 3 db? I find I stll have enough gain to hear noise, so I feel if the 
> signal was above noise, I will not lose any ability to hear the signal 
> when I use the splitter.
> 
> 73,
> Paul - K5ESW
> Raleigh, NC 
> 
> 
> > Hi Mike,
> > 
> > What you're suggesting sounds like a good idea. I don't often use 
> > diversity because of the dB loss and the stations I am usually trying 
> > to work are the faintest ones out there. instead, I use the two 
> > receivers linked on the same frequency, that gives me the best 
> > sensitivity and I just listen in stereo.
> > 
> > My goal is to be able to select the option of hearing from only the 
> > Rx antenna and nothing from the transmit antenna. I use my Rx as a 
> > beam in that I can null out undesirable signals &/or peak the station 
> > I am listening to. The transmit antenna hears 360 degrees and I want 
> > to at times eliminate that. I figured with all the options on the K3 
> > that there would be an easily selectable way to hear the Rx antenna 
> > on both receivers just like you can hear only the Tx antenna on both 
> > receivers. And maybe you can? I haven't figured out how to do that if 
> > it is built in.
> > 
> > 73,
> > 
> > Gary
> > KA1J
> > 
> > > Hi Gary,
> > > 
> > > You didn't indicate if you are running split or diversity. Here's a solution
> > > if you are in diversity.
> > > 
> > > There are times that you would like the RX ANT to be steered to both your
> > > MAIN RX and SUB RX. I do that with a splitter on my RX antenna cable. One
> > > leg goes to the AUX RF BNC socket for the SUB RX and the other leg goes to
> > > the RX ANT IN BNC socket on the KXV3A board. When I want to use my RX
> > > antenna for both receivers I press the RX ANT button. I'm still in diversity
> > > but I'm using the same antenna for both ears.
> > > 
> > > 73,
> > > Mike K2MK
> > > 
> > > 
> > > 
> > > Gary Smith-2 wrote
> > > > I connect my Rx antenna via the BNC below the SO239 outputs. I have a 
> > > > sub Receiver and have the Rx on the sub and listen to the vertical 
> > > > transmitting antenna on the main with my stereo headset.
> > > > 
> > > > There are times when I'd like to only hear the Rx antenna and not the 
> > > > vertical and to this point to do that, I turn off the audio from the 
> > > > main receiver & listen with the one ear to the sub Rx.
> > > > 
> > > > Listening to the transmit antenna with both ears I just don't use the 
> > > > sub rx. The question I'd like to know is: How can I listen to the sub 
> > > > Rx only with both ears? I could do it by inserting a stereo to mono 
> > > > adapter in line but that's going to be bothersome quickly. Any easy & 
> > > > quick way to do this?
> > > > 
> > > > 73,
> > > > Gary
> > > > KA1J
> > > 
> > > 
> > > 
> > > 
> > > 
> > > --
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