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From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo
Sent: Friday, August 24, 2007 9:30 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Duplexers
When you put the Bird between the TX and the duplexer, you
have changed the
length
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(sometimes chemically induced)
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mdm ted
Dave;
Sorry about that. The two meter one is a 28-37-02 and
the specifications are:
Frequency Range
:
144-174 MHz
Minimum T-R Separation
:
0.5 MHz
Tx Insertion Loss
:
1.5 dB
Rx
Title: Duplexers
Hey guys and gals.
First time poster here.
Just wondering if anyone has a set of duplexers with notch for 2M that they have hanging around and would like to get rid of?
Please let me know directly @ [EMAIL PROTECTED]
I really do appreciate it.
Thanks
Harold
kb7rsi
Las
I have two VHF duplexers for sale. Frequency ranges listed are based on the
manufacturers specifications. In the case of the DB products duplexer it
may in fact tune below 150 MHz although, I haven't tried. Since both need 2
MHz separation they may be more useful for other than Ham use? CAP?
Sent: Monday, March 15, 2004 2:42 PM
Subject: RE: [Repeater-Builder] duplexers
I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
that Black Magic is involved.
Steve
In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
coupling loops oriented for a particular
: David Schornak [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, March 15, 2004 5:25 PM
Subject: [Repeater-Builder] duplexers
has anyone or does anyone know where tofind the math formulas to help you
design a set of cavities for a duplexer? I have been looking on the web
/~g4kqu/gb3dx_photos.htm
- Original Message -
From: David Schornak [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, March 15, 2004 4:25 PM
Subject: [Repeater-Builder] duplexers
has anyone or does anyone know where tofind the math formulas to help you
design a set
Found this site too:
http://www.amalgamate2000.com/radio-hobbies/radio/coaxial_resonators.htm
- Original Message -
From: David Schornak [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, March 15, 2004 4:25 PM
Subject: [Repeater-Builder] duplexers
has anyone or does
I suspect when you add the coupling loop length that the interstage cables
will be on the order of 3/4 wave length, or around 10 or so.
I ran into the 3/4 wavelength business taking some 10 Sinclair VHF
cavities, and building a 5 channel UHF combiner with cavities and dual
junction isolators.
Steve I am beginning to believe that with as much info as I have found.
I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
that Black Magic is involved.
Steve
In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
coupling loops oriented for a particular
has anyone or does anyone know where tofind the math formulas to help you
design a set of cavities for a duplexer? I have been looking on the web and
in the arrl handbook and the big book of antennas, and todate I have found
plans for 2 meter duplexers.
I have yet to find any place where they show
I have it on good advice from Lloyd Alcorn at Wacom Products (RIP Wacom)
that Black Magic is involved.
Steve
In a nutshell, the cavities are either 1/4 or 3/4 wavelength with
coupling loops oriented for a particular degree of coupling, and also
the length affects coupling. Some cavities use 2
any way to tune duplexers without a scope or monitor ?
Bobby/N2BR
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