Scott, K3YT, wrote: I think my K2 is an excellent rig and will not risk it by
hooking it up
to a coax switch with another rig.
Point well taken, Scott. Certainly the discussion here has raised my awareness
of the issue of switch isolation, and I'll do something different (other than
relying
Tony, N2TK/KP2 wrote:
Guess I have been lucky. For the past year or so I have been using a Daiwa 2
position coax switch between my K2 and TS-950SDX to the amp. While listening
on the 950 through the coax switch I listen to the K2 on the low bands using
my receive antennas. If I want to use the
Maybe you will remain lucky. I just think it is a
risky practice and I will continue to keep my transceiver outputs
separated. All it takes is one time to smoke a nice rig and
you learn.
I guess it is like using the ground terminal (third prong) of
an 120v AC outlet for an RF ground. Poor
My measurements on ham grade coax switches show 40 dB or less isolation
between positions.
IN FACT, 60 dB is high even for a commercial grade switch. The simple types
from MFJ that are wires to a multiposition wafer switch do not shield quite
long wire runs from the adjacent connectors.
My measurements on ham grade coax switches show 40 dB or less isolation
between positions.
IN FACT, 60 dB is high even for a commercial grade switch. The simple types
from MFJ that are wires to a multiposition wafer switch do not shield quite
long wire runs from the adjacent
Hi Lee,
If your coax switch had 60db of isolation between ports (that's about the
most you could expect for small $$$), that would mean that a 100 watt signal
into Port A would produce a 0.1 milliwatt signal on Port B. While
0.1milliwatt into the receiver on Port B shouldn't destroy the front
Just to clarify...
I never have 2 rigs connected to one antenna with a
switch. That is just asking for trouble.
If I do a rig receive comparison, I remove all mikes paddles,
footswitches etc
so I do not accidentally key up. As another fellow said there can still be
a lot of signal
on
Sent: Thursday, March 2, 2006 11:01:51 AM
Subject: Re: [Elecraft] Coax Switch between two rigs
Just to clarify...
I never have 2 rigs connected to one antenna with a
switch. That is just asking for trouble.
If I do a rig receive comparison, I remove all mikes paddles,
footswitches etc
OKI know that this might be a dumb questions, but before I do a dumb
thing I want to ask the question. I have two rigs...one of which is the
K2/100. I have a two position coaxial switch (I think it is a Diawa CX201A)
that I picked up at a hamfest. Is there enough isolation between the
On Mar 1, 2006, at 6:06 AM, Lee Buller wrote:
OKI know that this might be a dumb questions, but before I do
a dumb thing I want to ask the question. I have two rigs...one of
which is the K2/100. I have a two position coaxial switch (I think
it is a Diawa CX201A) that I picked up
Lee,
It all depends on the switch - some isolate quite well, but others are
really bad.
If you want ot be really safe, rig up a relay for each transceiver to do the
switching task and short the coax going to the unused transceiver.
73,
Don W3FPR
-Original Message-
OKI know that
Lee Buller wrote:
OKI know that this might be a dumb questions, but before I do a dumb thing I want to ask the question. I have two rigs...one of which is the K2/100. I have a two position coaxial switch (I think it is a Diawa CX201A) that I picked up at a hamfest. Is there enough
The Daiwa CS201 DOES ground the unused terminal. Check it out.
K3YT
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Sent: Wednesday, March 01, 2006 10:17 AM
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Subject: Re: [Elecraft] Coax Switch between two rigs
The Daiwa CS201 DOES ground the unused terminal. Check
: [Elecraft] Coax Switch between two rigs (long)
If you yield to temptation and buy the Elecraft 1KW or 1.5 KW (almost here
according to a well placed representative last night) amp, or if you use any
amp, be VERY careful about switching as you describe. Of course most QRPers
would not dream
G'day,
| There is a neat way to check whether you are going to experience a
dangerous
| amount of RF pickup. If you can find a Radio Shack that still has and
can
| find hobbyist parts, look for their grain of wheat miniature
incandescent
| bulbs. They have some that are rated at 6v/25ma etc,
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