The M9887 is a tripler transistor in the UHF Mitreks and MSR2000, I need one
and wonder if anyone has one (new or used) - I just don't want to buy a Mitrek
becasue of the shipping, but the MSR exciter is small enough I would purchase
the entire module if someone has one, please let me know
I wonder why the Hall Electronics info wasn't usable? anyhow,
I tried to post a pdf of the schematic showing the right pinout not sure
where it is now on RB group. Look for Orion Program Cable
otherwise contact me off line and I can email it to you.
W6 MTF
--- In
There is a great set of apps that illustrate the Smith Chart on the web:
http://www.fourier-series.com/rf-concepts/smithchart.html
This illustrates the use of a stub:
http://www.fourier-series.com/rf-concepts/flash_programs/SmithChart3/smithchart3.html
of course knowing where to put a stub and
according to a post by Eric Lemmon
http://www.mail-archive.com/repeater-builder@yahoogroups.com/msg02135.html
The TLB1414C2 is a 100 watt continuous duty power amplifier for 42-50 MHz.
Take a look at the board and you can quickly confirm whether or not it is a UHF
PA.
Contact me offline if
1 in at 144 MHz is approx a 5% change and will affect slightly the RL esp if
the source impedance isn't 50 Ohms J0.
The overall electrical length technically is that of the coax at its VF plus
the length of the loop (in air). Adding an elbow can make a difference at this
freq.
W6 MTF
--- In
here is the way to do it, with yagis. I met one of the individuals involved in
this effort on a trip to Quincy and also was able to purchase several of the
Yagis that were made using the criteria that came out of this excellent work.
I believe Phelps Dodge sold that configuration (loops back to back on a support
pipe) as a railroad antenna, oriented in the direction of the tracks so they
could communicate with trains coming and going.
I remember the patterns showing an interesting cardiod in both directions.
Compared to a
Having used the DB-212 for a 6M repeater project, I can assure you they work
extremely well (unless you are on a rf noisy hilltop like I was (emphasize
WAS!) This is because they have more metal hanging out there to capture signals
(half wave) but more important they are a side mtd antenna
RJ Communications made these, a small Phoenix company (of the three companies
that made ferrite circulators in Phoenix: RJ, Celwave and EMR, RJ is the most
obscure, and I believe they are no longer in business.
The RJ design is identical to Celwave circulators. The one pictured is a
The trouble with pre-made boots is they require a specific sized hole in the
wall and if the opening is not the right size it won't fit.
I have been using the canned foam with one addition, I use some pieces of high
density packing material inside the wall, so the foam isn't required to fill
--- In Repeater-Builder@yahoogroups.com, kk7u_seattle [EMAIL PROTECTED]
wrote:
Hello all
I am assembling a Mastr II UHF station into a repeater and have
acquired a real FM exciter
and crystal for it.
I'm having trouble deciding from documents if I should feed it flat
or de-emphasized
Its all spelled out here:
http://www.repeater-builder.com/antenna/care-and-feeding-of-the-rf-isolator.pdf
--- In Repeater-Builder@yahoogroups.com, Ron Wright [EMAIL PROTECTED] wrote:
Hi all,
I have aquired a EMR Isolator, model 7450/4 for 150-170 Mhz and tuned
to 155 MHz.
It has 3
skipp, I could never get my 6M rcvr quiet on the site you refer to,
remember? despite a pass filter ahead of the rcvr, it was no solution
to on-channel grunge, besides a mix from the CHP LB nearby also. Ah well!
W6MTF
--- In Repeater-Builder@yahoogroups.com, Nate Duehr [EMAIL PROTECTED] wrote:
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