All this discussion about duplexer tuning and cabling is making me
wonder if I should not order a duplexer for the TKR-750 and just use
separate TX and RX antennas. Most repeaters, of course, operate on a
specific frequency pair but, since mine will be mobile and could be
set up anywhere,
That's EXACTLY what the radio world has been needing
for decades: bungee coax. We already have lossy coax,
and leaky coax. We definitely need stretchy coax.
That would make the circle complete.
I love it. You should send that suggestion to Andrew
or maybe even Belden. Make sure the cable you end
At 1/21/2006 04:48, you wrote:
If you use UHF male connectors, I don't know where you
measure from.
I believe it would be the same as for the male Ns (tip to tip). That puts
your signal just inside the can, where the loop should be.
Bob NO6B
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At 1/20/2006 21:27, you wrote:
All this discussion about duplexer tuning and cabling is making me
wonder if I should not order a duplexer for the TKR-750 and just use
separate TX and RX antennas. Most repeaters, of course, operate on a
specific frequency pair but, since mine will be mobile and
Some time back I worked with a 155 Mhz Sinclair Duplexer in the 2M band. I
could not get the notches to tune properly, so I added a Type N elbow in one
leg of the circuit. This made the coaxial jumper about 1 longer (bungee
coax) and solved a problem.
I would be much surprised if cables were an
Sorry about that... It was *supposed* to go directly
It's been one of them days
Kevin Custer wrote:
See attached:
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The local ARES group here has had a Spectra
Portable Repeater model P1820AX donated to them.
I don't know diddly-squat about them, and haven't
laid eyes on it, so does anybody know from the
model number if it is VHF or UHF, and
what it takes to program it? I suspect from the name
that it has at
Both Kevin and Mike already have copies of the
scans I made yesterday. The ComCenterCorp Encoder
scan is just the adapter needed to use non motorhead
receivers in a Spectra Tac / GE or RCA (yes RCA
made a voter) System.
I've sent copied direct to you if the email address
I found at
Paul,
There are many useful programs available for calculating duplexer isolation
and antenna separation. I happen to like CommShop for Windows, but I know
that it (like all of the other programs) makes some assumptions in the
calculations.
I plugged in 25 watts for TX power, 144.000/144.600
Eric Lemmon [EMAIL PROTECTED] wrote:
In my area of California, the 2m coordinator (TASMA)
has set aside a wide-spaced pair exclusively for
portable/mobile repeater operation.
There are/were wide split repeater pairs in the
originl ARRL 2M band plan. Before I learned how
to deal with
The length of the jumper cables between the cans has a profound
effect upon the insertion loss at the pass frequency, and relatively
little effect upon the isolation at the notch frequency.
73, Eric Lemmon WB6FLY
Eric,
I'm curious why you say this, as it contradicts what I would
Jeff DePolo wrote:
In contrast, for proper reject notch performance, there has to be correct
phasing between cavities. The notches are effectively shorts at the notch
frequency, and if they are not repeated at 1/2 wavelength intervals between
cavities, they will tend to not align when
CSC will porgram a prom for you for about $35.00. Contact them. Search
on Google.
Dave WB2FTX
kb0jyl1 wrote:
I am sure this has been asked a thousand times all ready, so please
excuse me for doing it again as new memeber of your group.
I am looking for programing and wireing information for
Hello
I need a manual for a UHF Mocom 70. Mine dissappeared.
Any help is appreciated. [EMAIL PROTECTED]Dave N8DNZ
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Hi Gang
I know this was done a while ago, Is anyone interested in a repeater
discusson
net over IRLP or Echolink? might be able to use one of the IRLP
reflectors that bridge echolink and IRLP together
Thanks
Scott Ka9sln
IRLP 8380
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By your description, the following manuals by part number, are
appropriate:
68-81011E30
68-81012E60
68-81023E55
Also which version do you have ... the varactor multiplier in
the transmitter (early) or the microstrip version (late)
Neil - WA6KLA
dph96266 wrote:
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
Hi Gang
I know this was done a while ago, Is anyone interested in a repeater
discusson
net over IRLP or Echolink? might be able to use one of the IRLP
reflectors that bridge echolink and IRLP together
Thanks
Scott Ka9sln
I would be much surprised if cables were an issue, unless they had
been
messed with extensively or modified. Usually a duplexer just sits
there and
works for years and years, and the cables are usually not moved very
much,
unless someone monkeys with things.
True, or it was not right to
Hell yeah!
I tried to do this a while back, but we tried over HF.
I think IRLP, or echolink, or both would be a good idea.
Thoughts?
Thanks,
Jed
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Saturday, January 21, 2006 2:39 PM
To:
I love it. You should send that suggestion to Andrew
or maybe even Belden. Make sure the cable you end up
with is double-shielded, silver-tinned, flexible, and
rated for outdoor use (no foil and braid mixed
together). Ask for patent rights while you're at it.
In theory, it should be
You can't simply cut the jumper cables to a certain fraction of the
wavelength, because the coupling loops inside the cans are part of
the total length.
That's what I figured.
It takes a network analyzer to determine the optimum length, and
most folks simply don't feel that it's
Jeff,
I'll be the first to admit that reality often contradicts theory. However,
both EMR and TX-RX have published application notes which support my
statement.
Some time ago, I tried to tune up a Sinclair Q-202G BpBr duplexer for a Ham,
which simply involved moving from one 2m pair to another
--- In Repe
As I recall, the low-split Sinclair harness had jumpers that were
about 2
longer than the high-split jumpers. Even though theory may dictate
otherwise, this particular incident with this duplexer proved to me
that
incorrect jumper lengths between cans may have a profound effect
That sounds like a good idea
AC0Y
Echolink node# 86525
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
Hi Gang
I know this was done a while ago, Is anyone interested in a repeater
discusson
net over IRLP or Echolink? might be able to use one of the IRLP
reflectors that
Wow Thanks for such a fast response. I really don't know what I inherited here, just went to the file and the folder was missing. Is there a easy way of identifying the characteristics between the varactor and the micro strip? I have worked on the later versions and don't believe I have
Dave,
That's when a good network analyzer's dynamic range really is important.
With a DR in excess of 125 dB, the noise floor is not a factor even if
you're tuning a six-cavity duplexer with 8 or 10 cans- and there is still
the capability to increase the stimulus power. Once I got used to using
Once a new low-split harness was
purchased directly from Sinclair (about $125, as I recall) and
installed, the duplexer tuned up with the expected pass loss of
about 1.6 dB. The notch attenuation was within a dB of the previous
value, using the incorrect harness.
Well, my guess is that
Eric,
Can you provide links to these?
Chuck
WB2EDV
Eric Lemmon wrote:
Jeff,
I'll be the first to admit that reality often contradicts theory. However,
both EMR and TX-RX have published application notes which support my
statement.
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Jeff,
That's quite possible, but I did not check it because the Sinclair harness
was completely made up of Delta connectors crimped onto RG-214/U cable. The
harness came preassembled as one long piece of coax with five N-male tees
crimped into place, with N-male connectors on the ends going to
Thanks for the links. I've seen them all previously. I do not see where
any of them indicate that the interconnect cables affect the bandpass
loss. Where did you find this?
Maybe I missed it somewhere.
Chuck
WB2EDV
Eric Lemmon wrote:
Chuck,
I don't know if the papers I have were ever
Anyone know much about this radio..moreover, anyone know what battery it
takes.. the battery was removed by a previous owner, wanting to use it as a
link radio, but w/o the battery, it won't hold a memory
Thank You for your time,
Glen Briggs - KBØRPJ
Grundy County Amateur Radio Emergency
That's when a good network analyzer's dynamic range really is
important.
With a DR in excess of 125 dB, the noise floor is not a factor even if
you're tuning a six-cavity duplexer with 8 or 10 cans- and there is
still
the capability to increase the stimulus power. Once I got used to
using
At 1/21/2006 18:18, you wrote:
Dave,
That's when a good network analyzer's dynamic range really is important.
With a DR in excess of 125 dB, the noise floor is not a factor even if
you're tuning a six-cavity duplexer with 8 or 10 cans- and there is still
the capability to increase the stimulus
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