hi
see link below it may be of help
i have built a 145mhz duplexer and used the loop and cap that i can rotate
2 cans give me 70+db
I used cable lengths below rg223
1) what should be my cable lengths between cans.= 1/4 WAVE APPROX 34CM FOR
145MHZ
2) what should my cable length between the
Re: Building a notch duplexer with notch cans.
NORM KNAPP nkn...@... wrote:
I am going to try to build my own loop assemblies based
on some Sinclairs I have seen. I will post photos as well.
The Telewave loop assemblies are almost $80 each. That
isn't bad, but if I can build them to
allan crites wa9...@... wrote:
Gentlemen:
For those wishing to convert a BP cavity to operate as both
a BP and notch cavity there exists a simple and convenient
way to do so with out having to do surgery on the innards
of the cavity.
We're all about simple and convenient...
One only
--- On Tue, 2/2/10, skipp025 skipp...@yahoo.com wrote:
From: skipp025 skipp...@yahoo.com
Subject: [Repeater-Builder] Re: Building a notch duplexer with notch cans.
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, February 2, 2010, 11:02 AM
@yahoogroups.com
Sent: Mon Feb 01 21:55:35 2010
Subject: Re: [Repeater-Builder] Re: Building a notch duplexer with notch cans.
Norm,
The purpose of using 1/2 WL transmission lines to connect to each side of the
variable capacitor is to get the cap as close as possible to the coupling loop.
The 1/2 WL
--- In Repeater-Builder@yahoogroups.com, skipp025 skipp...@... wrote:
Re: Building a notch duplexer with notch cans.
You would not be restricted to using DB/Andrew/DB-Spectra loops
if the proper type and size were available from another source.
Regardless, the price is probably going
@yahoogroups.com
Sent: Mon Feb 01 07:46:16 2010
Subject: [Repeater-Builder] Re: Building a notch duplexer with notch cans.
--- In Repeater-Builder@yahoogroups.com
mailto:Repeater-Builder%40yahoogroups.com , skipp025 skipp...@... wrote:
Re: Building a notch duplexer with notch cans.
You
have any problems or questions I will be willing to help. Just ask.
Allan Crites WA9ZZU
--- On Mon, 2/1/10, NORM KNAPP nkn...@twowayradio.net wrote:
From: NORM KNAPP nkn...@twowayradio.net
Subject: Re: [Repeater-Builder] Re: Building a notch duplexer with notch cans.
To: Repeater-Builder
@yahoogroups.com
To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
Sent: Mon Feb 01 10:20:59 2010
Subject: Re: [Repeater-Builder] Re: Building a notch duplexer with notch cans.
Gentlemen:
For those wishing to convert a BP cavity to operate as both a BP and notch
cavity there exists
@
yahoogroups. com
Sent: Mon Feb 01 10:20:59 2010
Subject: Re: [Repeater-Builder] Re: Building a notch
duplexer with notch cans.
Gentlemen:
For those wishing to convert a BP cavity to operate as both
a BP and notch cavity there exists a simple and convenient
way
KNAPP nkn...@twowayradio.net wrote:
From: NORM KNAPP nkn...@twowayradio.net
Subject: Re: [Repeater-Builder] Re: Building a notch duplexer with notch cans.
To: Repeater-Builder@yahoogroups.com
Date: Monday, February 1, 2010, 2:04 PM
i looked at this duplexer, but those are pass/reject cavities. the cavities
that i have are just notch with no pass. they have a single loop in each
cavitiy.
I would love to know how to make these into pass/reject, but that will not
happen with these. there is a second hole with a cap, that
As far as i have measured to this point, some where between 2 to 3db loss with
3 notches per side, with less loss on .125 and more loss on .625.
the RX is .625 and tx is .125.
1) It looks like i could put 4 notches on .125 and 2 notches on .625 to reduce
losses on .625. am i totally wrong in
i looked at them a few weeks ago, if i center the notch on the .625 3 notches
look like 66 to 70db with about 2 db loss.
I can make the loss less by rotating the loops, but the notches go from about
30db each to just about 20db each.
i looked at the pass cans. they will give about 12 to
kd4wov kd4...@... wrote:
i looked at this duplexer, but those are pass/reject
cavities. the cavities that i have are just notch with
no pass. they have a single loop in each cavitiy.
I would love to know how to make these into pass/reject,
but that will not happen with these. there
these are db 4140 notch cans. the origional connecting
cables are 4 from connector to connector, which gives
6 from center of tee to center of tee. they are from
a VHF 155/154 mhz range.
The comments in my most recent previous post were directed
toward a Sinclair Product because I
I will look to see if DB/andrew/ who ever owns them now, still make loops for
these. I have considered fabricating some spare loops just to have on hand.
we have 4 pass cans at the site in a cabinet that are just waiting to have some
vari caps installed to make them into pass/reject cans.
as
Re: Building a notch duplexer with notch cans.
kd4wov kd4...@... wrote:
I will look to see if DB/andrew/ who ever owns them now, still
make loops for these. I have considered fabricating some
spare loops just to have on hand.
You would not be restricted to using DB/Andrew/DB-Spectra loops
--- In Repeater-Builder@yahoogroups.com, Graham gram.warring...@... wrote:
If it were me... I would make 2 C2037 mulitcouple filters. You have the
cans to do it ..
Just takes a few cables and tune it up.. The C2037 ( Sinclair ) will have a 3
db loss.. lots of isolation and be the best
If it were me... I would make 2 C2037 mulitcouple filters. You have the cans
to do it ..
Just takes a few cables and tune it up.. The C2037 ( Sinclair ) will have a 3
db loss.. lots of isolation and be the best bet for you.
Graham
VE3WGW
these are db 4140 notch cans. the origional connecting cables are 4 from
connector to connector, which gives 6 from center of tee to center of tee.
they are from a VHF 155/154 mhz range.
--- In Repeater-Builder@yahoogroups.com, kd4wov kd4...@... wrote:
Hello All,
I am building a duplexer
My question to you is... do you think the cavities have
enough Q so they might be configured for a 500 KHz split
duplexer without excessive loss?
s.
kd4wov kd4...@... wrote:
Hello All,
I am building a duplexer for use on 150.125 tx and 150.625 rx. this ia for
a mars machine. Yes i
22 matches
Mail list logo
