I'm working on a theoretical design, but I need 5 circulators.
On Thu, Oct 29, 2009 at 5:09 PM, cruizzer77 wrote:
>
>
> That helical duplexer design is actually the only one I have ever heard of. I
> think I even contacted the builder once but he said it was too long ago to
> remember additiona
That helical duplexer design is actually the only one I have ever heard of. I
think I even contacted the builder once but he said it was too long ago to
remember additional details what I can understand.
Even though this particular one sure works, as long as it's the only one around
obviously
Hi Walter,
If the paging operator is bitching about .6db of loss from an isolator. ft
it were my site I would have made him add a band pass can as well or he
could go find another site to trash. Most likely we would have made the
operator run through the site combiner and then he would really h
Get a good notch filter on the link radio, that should take care of you.
-BR/KF4ZWZ
On Thu, Oct 29, 2009 at 1:55 PM, kerinvale wrote:
>
>
> Hi guys.I would like to throw a interesting question to the forum.I have
> several uhf repeaters with links to our central hub .
> .one site receives on
Hi guys.I would like to throw a interesting question to the forum.I have
several uhf repeaters with links to our central hub .
.one site receives on 479.350 and transmits on 474.150 through a 6ld450s
diplexer into a 6db antenna mounted 9 meters above the repeater site and we
have a 3 watt link radi
The Helical Duplexer tends to be lossy... it's hard to
get/keep the Q value respectfully high in many home-brew
projects (but it can be done. You might research some
of the older Decibel Low-Band units for examples. There are
actually a fair number of mod/construction projects posted
on the
I think their original design used paint cans for the chambers, but
then went to copper when they couldn't solder easily to the steel.
http://members.cox.net/xsamo/r150.htm
http://members.cox.net/xsamo/01duplex.htm
http://k5jmp.us/Six_Meter_Heliax_and_Helical_Duplexer_info/01duplex.PDF
On Thu, O
We're going to build a 6m repeater in a place where space is very limited,
which means that building a full-size cavity duplexer is not an option.
Of course there's the heliax duplexer, but I would also like to evaluate other
possibilities, i.e. the helical duplexer or even a hybrid ring duplexe
On Thu, Oct 29, 2009 at 1:45 PM, Joe wrote:
> Mike Besemer (WM4B) wrote:
>>
>> Joe,
>>
>> The problem isn’t traffic dependant (10 am being a busy time), as I
>> monitor on and off all day and there is PLENTY of traffic all day
>> long. It seems to have more to do with temperature. You can cle
Mike Besemer (WM4B) wrote:
>
> Joe,
>
> The problem isn’t traffic dependant (10 am being a busy time), as I
> monitor on and off all day and there is PLENTY of traffic all day
> long. It seems to have more to do with temperature. You can clearly
> hear the signals come on and fade off frequency
Definitely on a Delta mobile. RANGRs are darker in color and more rounded.
But, it's also definitely a MSR exciter.
The guy likely ran out of desktop. Happens to me a lot, too. :-)
Joe M.
Charles Schmell wrote:
>
>
> Skipp:
> Looks like its placed on top of a legal pad, on top of a GE Rangr o
We had a wandering spur passing through the Game and Fish statewide frequency
at 151 MHz.
The maintenance engineer had to put the spec-a on the IF section of the
affected receiver [MastrII] to actually see it.
One he saw it, he demodded the signal and it was a local paging outfit on 454
MHz. The
Nope, That's not a Micor, it's a GE something or another (Delta??). If
you look closely at the wording under the upper part of the card, it
ends in 'ic.'
I had to go look for myself since I couldn't figure out how, or why one
would install a MSR2K exciter in a micor.
Scott Zimmerman
Amateur R
Skipp:
Looks like its placed on top of a legal pad, on top of a GE Rangr or Delta
mobile.
Funny how they pick the backgrounds for the pictures.
Chas, KS3Z
--- On Thu, 10/29/09, skipp025 wrote:
From: skipp025
Subject: [Repeater-Builder] MSR Exciter Module installed in a Micor Mobile?
To: R
Have seen this several times where a transmitter went spurious. The worst
have been Johnsons. It's often temperature related, at least the frequency
of the spur. A spectrum analyzer and a directional antenna are your best
tools. A portable scanner is also very handy.
In one case we tracked down
Forgot to put in the item number...
Re: MSR Exciter Module installed in a Micor Mobile?
Ebay Item Number 350256769308
I went on a quick Ebay Search to see if I could find
an MSR-2000 Manual listed at Auction.
I hit on a strange looking MSR-2000 Exciter (transmitter)
board inside a Micor
Mike-
On Thu, 29 Oct 2009 05:33:10 -0500, Mike Besemer (WM4B)
wrote:
> I was told (caveat) that he verified the spectrum after the interference
> started. Since he's investing quite a bit of time into helping clear
> this
> up, I have to believe he's done that.
>
>
A few years ag
This sounds like a problem I traced about 20 years ago on a VHF
paging system. The PA was tube and there was some issue the tech had
with the PA not firing on rf drive .. so he locked the PTT to the PA
on all the time and then just turned the exciter on and offThe
problem was the PA was sel
A while back in time, I worked 20 miles south of Chapel Hill, NC.
During the late morning and afternoon our vhf fire, low band EM, and a
UHF carrier squelch sheriff mutual aid channels starting getting garbage
that was noisy but occurred on the various channels from 47 mhs to 453 mhz.
A paging
Joe,
I was told (caveat) that he verified the spectrum after the interference
started. Since he's investing quite a bit of time into helping clear this
up, I have to believe he's done that.
73,
Mike
WM4B
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.c
Joe,
The problem isn't traffic dependant (10 am being a busy time), as I monitor
on and off all day and there is PLENTY of traffic all day long. It seems to
have more to do with temperature. You can clearly hear the signals come on
and fade off frequency.
It's also easy to hear which tran
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