During FD we were discussing portable antenna options for next year.
We were considering a 33' fiberglass pole with a veritical and a G5RV on
the same pole. A 31' piece on wire running vertically down the pole and
also a G5RV supported by that same pole. Then just connect them to the
K3
Rich,
It all depends on how you have configured the AUX ANT input for the subRX.
If you have configured the Sub AUX ANT to use the non-transmit ANT1/2
jacks, then you may have a problem with overload and COR activation on
the non-transmit antenna. In that case, the use of some external
Probably not a good idea.
The interaction between the vertical and the feed to the G5RV will be
severe. You will have large quantities of RF forced onto the G5RV feeder.
I ran a quick EZNEC model of 2 verticals 2.4 apart. It indicates that
at 100w you would induce 45w onto the feeder. Even
Most interactions between feeders and antennas and other antennas and other
antennas' feeders can be managed with physical layout design and effective
attention to common mode current blocking.
To be aware of these interactions, one must cultivate vision of these
circumstances as a soup of *all*
Hi to Rich and the group
During field day I ran my KX3 with the tuner from the KXPA100 at 5 watts. I had
my 44 ft doublet fed with 22 ft of window line on my 24 ft painters pole in the
center with a 10 ft PVC support on each end of the doublet. I had a 33 ft MFJ
fiberglass mast with 29 ft of
Interesting. I looked at it from the other direction. With the K3 ANT1
connected to a dummy load and ANT2 connected also to a dummy load via my
WM-2 QRP wattmeter.
With 100W out at ANT1, out of ANT2 I measured 30mW at 50MHz down to 1mW
at 7.1MHz. A range of -30dB to -50dB. 50MHz is not in
Oops,
I should have written that I saw 100mW at 50MHz, not 30 which was the
loss in dB.
Regards,
Mike VP8NO
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Post:
You are getting some really worse numbers than I did.
You may have ant2 only terminated on one end of its cable connections,
which would be really worse on 6 meters than 160. There is one of those
bitty jacks that needs a cable attached to it and then terminated. It's
the other antenna
I thought it was clear that all I was looking at was a transmit
parameter, that is, what came out of ANT2 when ANT1 was was carrying a
signal. This gives an idea of the coupling across the C/O relay K18
which selects ANT1 or 2. In this context both ports were terminated.
I fail to see why I
In your context the ANT1 circuit was normally terminated, one port in the
transmitter, the other in an antenna. That's normal, a load on both ends.
ANT2 was NOT normally terminated unless you want to treat the reactive 10
k+ Z termination of the tiny capacitance across the relay as normal.
If
So what you are essentially saying is the K3 has a design fault because
in a perfectly normal factory configuration it is leaving a port
unterminated. Maybe it is the electronic equivalent of a Persian rug.
I'm not rigging anything, it's how it is right out of the box.
I think the real
The isolation between ANT 1 and ANT 2 varies from -76dB at 1.8MHz to -46dB at
50MHz.
This is measured with a signal generator, using the K3 S-meter, with ANT 2,
AUX RF and RX ANT IN terminated in 50 Ohms.
http://elecraft.365791.n2.nabble.com/file/n7509068/ANT1-2_leakage.jpg
The isolation
Subject: Re: [Elecraft] K3 ANT 1-2 isolation
The isolation between ANT 1 and ANT 2 varies from -76dB at 1.8MHz to -46dB
at
50MHz.
This is measured with a signal generator, using the K3 S-meter, with ANT 2,
AUX RF and RX ANT IN terminated in 50 Ohms.
http://elecraft.365791.n2.nabble.com/file/n7509068
True that the isolation between ATN1, ANT2 and RX Ant are poor. The solution
is to use a preamp in receive antennas so that signals from RX and TX
antennas are similar in strength.
Ignacy
--
View this message in context:
Poor is a bit harsh, what do you expect from a single small C/O relay.
Anything over 30dB isolation is a luxury.
Regards,
Mike VP8NO
On 26/04/2012 11:24, Ignacy wrote:
True that the isolation between ATN1, ANT2 and RX Ant are poor. The solution
is to use a preamp in receive antennas so that
Might be considered poor in relation to coaxial switches. Some of
these get 70 dB isolation.
73,
matt W6NIA
On Thu, 26 Apr 2012 15:44:39 -0300, you wrote:
Poor is a bit harsh, what do you expect from a single small C/O relay.
Anything over 30dB isolation is a luxury.
Regards,
Mike VP8NO
I have much greater separations than 30 dB when the jacks are terminated
with real lines, so I'll have to assume that readings like 30 dB are
listening in an unterminated port with signals on another. You can't
measure separation (or RX noise) without line terminations (resistor or
real antenna)
Need help with some troubleshooting...here is the background:
After being gone for a month I returned to find that my iMac would not
boot up, the LP100 display had noticeably dimmed and my Steppir 3 ele
beam had super high SWR on 20m only. Although I had disconnected p/s and
antennas, we had an
Need help with some troubleshooting...here is the background:
After being gone for a month I returned to find that my iMac would not
boot up, the LP100 display had noticeably dimmed and my Steppir 3 ele
beam had super high SWR on 20m only. Although I had disconnected p/s and
antennas, we had an
Tom,
So, here is the question. If the SO239 was bad at Ant1, why does it
work on all bands except 20m? Unfortunately, this was a factory
built unit, #250, so my knowledge of the insides is very sketchy.
What do I need to look for?
Before doing anything else, connect the dummy load to Ant 1,
,
Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of cx...@4email.net
Sent: Friday, November 26, 2010 2:24 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 Ant 1?
Need help with some troubleshooting...here
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