Mike Morris WA6ILQ wrote:
And some evening spend some time reading this:
http://www.repeater-builder.com/db/db-about-rf-communications.pdf
Yes, some of the info is 40 years old, but the physics of RF hasn't
changed.
Mike WA6ILQ
And never will!
At least not until somebody figures out how
John,
In the cases I have seen, an Iso-Tee is constructed by removing the center
pin in the offset side of a UHF T connector, grinding it down until it is
flat with the insulator surface (add a notch so you can re-insert with a
screwdriver) and reinsert the pin into the connector. This
Additional accuracy can be obtained by providing a 50 ohm load for the
generator. This can be accomplished by connecting the center of the ISO T
to
the center of the unmodified T to form an H configuration. Then connect
the generator to one end of the unmodified T and a 50 ohm load to the
Replace the lmr400 with heliax .we hjave had nothing but problems with it
since changing it to heliax the problem has been cleared up
Thank You,
Ian Wells,
Kerinvale Comaudio,
361 Camboon Road.Biloela.4715
Phone 0749922574 or 0409159932
www.kerinvalecomaudio.com.au
---Original
Bill,
In finding desense first one must locate the problem. A given.
I would start with putting GOOD dummy load on the duplexer output and do a
desense test. This can be done with a local signal gen where you can vary the
gen output and keying and unkey the transmitter. You should see no
Don't leave out the isolated TEE between the duplexer and dummy load,
Ron. Hi, Steve NU5D
Ron Wright wrote:
Bill,
In finding desense first one must locate the problem. A given.
I would start with putting GOOD dummy load on the duplexer output and do a
desense test. This can be done
Have you run the repeater into a dummy load and check for desense?
David
=
From: Bill Wilson [EMAIL PROTECTED]
Date: 2008/07/07 Mon AM 02:24:30 WET
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] New Repeater Desense Problems
Greetings
-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Tuesday, July 08, 2008 9:39 AM
To: Bill Wilson; Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] New Repeater Desense Problems
Have you run the repeater into a dummy load and check for desense
Just to echo previous comments, the LMR type cable (any cable with aluminum
foil/braid combination) is suspect. This subject comes up here about every
other week.
Chuck
WB2EDV
- Original Message -
From: Bill Wilson [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sunday,
de W5DK wrote:
Not to hijack the thread, but a dummy load is NOT always a perfect
test to eliminate the equipment. I think it’s a good start though.
I just solved a situation where I had 15 db desense into a 600ft
feedline / antenna and ZERO desense into a dummy load. This was using
a
At 07:24 PM 07/06/08, you wrote:
Greetings Group,
I had hoped to be able to purchase off-the-shelf components for a 2
meter repeater for our local club to use.
I purchased a Maggoire HiPro R1VHF35, 35 watt version, and with their
recommendation a set of FiPlex DVN-1533L Duplexers (6 cans).
At 7/8/2008 11:37, you wrote:
If you can't hear them you can't repeat them, so a repeater that has a 1.5db
of feedline loss (100 feet of LMR400 at 2m) from the antenna to the receiver
is not going to hear as well as one that has
0.5db of loss (100 feet of 7/8 inch
heliax at 2m).
...except if
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