To All: I am still trying to locate a Coaxial Relay with a 12 vdc coil and
either N or UHF connectors.
Please contact me off net if you have one available.
Many Thanks.
Fred seamansfh at sbcglobal dot net
They were very good and still are! However, I could not give mine away. I
just took 3 stations and a few extra Rx and Tx strips to the dump.
They are history now.
Fred W5VAY
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Pointman
Jeff: Kathrein-Scala Antennas makes good heavy duty yagi and a log periodic
antennas with radom and without. I have used them before. They will survive
most mountain tops with ice and salt water sprays. They are expensive.
Fred W5VAY
_
From: Repeater-Builder@yahoogroups.com
Does anybody have a 5C Receive and a 5C Transmit ICOM's on any frequency for
the 450 to 470 MHz band in MASTR II, that they would be willing to part
with.
I plan to send them to ICM to be recrystaled.
Please reply off net to seaman...@sbcglobal.net.
Fred W5VAY
: Re: [Repeater-Builder] 5C ICOMs
At 02:16 PM 6/19/2010, Fred Seamans wrote:
Does anybody have a 5C Receive and a 5C Transmit ICOMs on any frequency for
the 450 to 470 MHz band in MASTR II, that they would be willing to part
with.
I plan to send them to ICM to be recrystaled.
Please
To All: I am going to get completely away from MASTR Pro equipment. If
anybody wants anything, contact me off net and I'll see if I have it. Cost
very cheep plus shipping. Anything not gone in three weeks is going to the
trash.
seaman...@sbcglobal.net
Fred W5VAY
Skip: Yes, I Know; The first radio system I designed had 74 Repeaters and
over 150 mobiles with some microwave interconnects. I have run out of space,
and now I have all MASTR II and Delta's.
Fred W5VAY
_
From: Repeater-Builder@yahoogroups.com
thought it ran circles around anything else available
and, as Skipp and others noted, it's still an excellent receiver. Which band
are your radios on?
Tom DGN
--- In Repeater-Builder@yahoogroups.com
mailto:Repeater-Builder%40yahoogroups.com , Fred Seamans seaman...@...
wrote:
To All: I am going
Jed: I have worked on voting systems from as little as 2 receivers to as
many as 36 receivers in a public safety system. The best routing of the
voted audio is by fiber optic cable, then microwave, then RF point to point
link and lastly and the cheapest by telephone line. If you are using
Not enough information given to draw any conclusion!
Fred W5VAY
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of mimomeg
Sent: Sunday, June 06, 2010 9:56 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] transmission
I have tried DB, Comm. Products, and Antenna Specialist for some Mountain
top sites in Montana. None of them held up through the Winter. I finally
went to Scala, now Kathrein Scala Division, had them build a tank of an
antenna in 1989. To the best of my knowledge they are still in service.
I am looking for a Dow-Key antenna relay with a 12 VDC coil. If anyone has
one, please contact me off net!
Fred W5VAY
Does anybody have GE's Data-File LBI-30450?
This is a Touch Tone Encoder for the MASTR II Controller.
If you do Please contact me Fred W5VAY seaman...@sbcglobal.net.
Thank You!
PS: There is none on the MASTR LBI list.
I am looking for an older Touch Tone Mobile Encoder, BRAMCO (Division of
LEDEX in the 70's), Model 6047! This was used with MASTR II mobiles.
If anyone has one in there old stuff and is willing to part with it, Contact
me off net!
Fred W5VAY
I have for sale a Bird Model 4275 Signal Sampler with adjustable coupling
and with either type N or UHF connectors.
This can be viewed in Birds General Catalog at:
HTTP://www.bird-technologies.com/products/catalogs/1118-BTG-GenCat0010.p
df
Scroll down to Page 27 in the Catalog.
Start with the ARRL Hand Book; it can be an older dated one!
Fred
W5VAY
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of tetrault
Sent: Monday, January 25, 2010 1:19 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder]
Are you wanting a GE MASTR Pro style or a GE MASTR II style Desk Mate
cabinet?
Fred W5VAY
Ponca City OK
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Curtis
Sent: Friday, July 10, 2009 6:37 PM
To:
When a 224 antenna is mounted on a leg of a 25G, 45G, 55G towers, the
patterns are close to what DB had predicted as allowances are made for the
distance off of the leg of the tower. EG: 1/4, 1/2, wavelength, etc. On
large face towers anything is possible. As an example I mounted a DB 224 on
the
Does anybody have any 5C ICOM's for MASTR II in their junk box that they are
willing to get rid of? (Not the large ones used in the PLL Exciter!)
I would like to get 8 of them. The frequency is not important as I am going
to recrystal them.
Let me know off net. Many Thanks
Fred W5VAY
Blue is for the receive and red is for the transmit.
Fred
_
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mark
Sent: Tuesday, March 10, 2009 11:40 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] BRAMCO Reeds
To All: GE Did make a solid state 200 watt UHF Transmitter. They used a 100
watt PA driver to two 100 watt PA's less the 40 watt driver board and then
recombined the two 100 watt to get 200 watts out.
They sure are not efficient! I agree it would be better to use a 100 watt PA
at reduced power.
I would not use them. The front end on a scanner receiver is as wide as a
double barn door and all kinds of junk comes through.
Fred W5VAY
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of jstechnicalservice
Sent: Monday, August 11, 2008 3:10 PM
Your are just going to have to make time. Frequency coordination is a slow
process no matter which service you are eligible for. You might start with
APCO International to find out if you are eligible under the Public Safety
area. If not they can direct you in the right direction.
Fred W5VAY
I want to locate the station Tx and Rx top and bottom strip covers with the
meter plug on the top cover of each for a 150 MHz Tx and Rx and a 450 MHz Tx
and Rx.
If anybody has these 4 covers and would be willing to pitch them my way,
please contact me direct. I do not want the Tx or Rx strips,
Not all ACE Hardware stores have a complete line of Stainless hardware! Also
be careful of stainless from China. Large size bolts are sometimes
mis-marked as to their strength and some stainless is not pure. Take along a
good magnet when purchasing stainless products. You can't measure the
quality
One method with Scotchkoat, which we used in the Gulf of Mexico platforms
cabling. Wrap a good Scotch tape over the cable and connectors tightly
extending the wrap 2 to 3 inches over the cable jacket on each side. Then
scotchcoat the tape wrap a small portion of the cable covering. Then tape
wrap
Sorry I left the word and out of the second sentence. It should be Then
scotchcoat the tape wrap and a small portion of the cable covering.
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Fred Seamans
Sent: Friday, January 18, 2008 9:05 AM
You get what you pay for! GE and Motorola had quality control programs in
use when MII and MICOR were being built that increased the cost of their
equipment. Not only were the radios put through a final test, but the
incoming components were tested prior to manufacturing. I wonder where the
David: I do not want to be too picky, but your simple statement is not fully
correct. To place components in series or parallel depends on what you are
trying to accomplish as a final result!
Fred W5VAY
Retired Engineer
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL
Kevin, Sorry I must disagree with you. When isolators were first introduced to
the two way radio systems in the early 70's they were for the purpose of
reducing intermod on congested sites. Then others saw the benefit of protecting
the solid state finals, they were also used for that purpose.
John: There are two things that you must protect you repeater receiver from.
One is the on frequency signal, which will come from the repeater transmitter
noise output and the second one is the blocking signal which prevents the
repeater receiver from receiving the desired signal, which will
Eric / Don,
Eric you are so right; A properly designed electrical distribution system--.
However many systems are not designed properly and more are not maintained
properly! It is left up to the customer to correct for these problems. Many 4kv
systems just ahead of the pole transformers do not
Not all WD are experimental calls. My XYL had WD5DXK call as a General
until she let it expire in Oct. 2006. She is a quadriplegic with MS and felt
that there was no reason to keep her license as she has not been on the air for
a long time. Age and illness gets to all of us eventually.
Fred
To All Interested: I would invite you attention to a paper presented by Kenneth
Bullington, Radio Propagation at Frequencies Above 30 Meagcycles in the
October 1947 Proceedings of the I.R.E. - Waves and Electronics Section. Most
all radio propagation prediction methods over the years have been
I agree with the other comments that 62 to 100 watts output will not make
that much difference. From your description if the handhelds power output of
?(2 to 5 watts), is making it into the repeater receiver at full saturation
and 62 watts out of the duplexer is not making it into the handhelds
This is what happens when the a customer who knows nothing about radio,
wants something cheep, buys low bid from someone who is out for a fast buck
and the customer who is probably an administrator, is unwilling to admit
that they made a mistake! All they had to do is write a performance
Please do not down grade all engineers. Some of us with degrees realize that
the real world is not the lab world. Over 45 years has shown me that very
few antenna installations are the same. I have seen deep nulls on single
antenna installations on large surface towers. One I remember well, you
For those of you that are just beginning to experiment with repeater
building, try using a little common sense. The manufactures would not have
invested a lot of money in shielding and bypass caps if they thought they
could get by with less. The MII M series mobile was never intended to be
used
: Tuesday, February 22, 2005 9:58 AM
Subject: Re: [Repeater-Builder] Re: M2 CAS
Hello Fred,
Very good points. Question, have you successfully used an IFAS with a
different IF frequency without modifications?
Joe, K1ke
Fred Seamans [EMAIL PROTECTED] wrote
The receiver only power supply for a MASTR Pro series is a 4EP39. Not all
have Line Drivers. But that card is advisable as it has de-emphasis ckt on
the card. Using the line driver lets you connect up a speaker on the
Receiver and have separate volume/line output controls.
Fred W5VAY
-
Everyone: All the more reasons that when you order Crystals; PLACE THE ORDER
by LETTER with all crystal types, operating frequency, and oscillating
frequency specified in writing, so there is no misunderstandings! Make and
keep a copy of the letter order until all items are correctly received.
Neil: It sure would make a big difference. Metal = Mechanical and Plastic =
Transistorized.
Our age is told by the first types of test equipment we used. Mine was the
old Lampkin Dev. Monitor and Lampkin's Highly unstable frequency calibrated
VFO without the temperature comp.
Fred
W5VAY
-
Coy; I would suggest that you add the following after --- million. in you
descriptions of the 5C and 2C ICOM's; over the temperature range of -40
Deg.C. to +70 Deg.C. providing you set the initial frequency of the ICOM as
described in the GE MASTR II manual. Less you move the crystal's S curve
Does anybody have an older HP WWVB,
60Khzreceiver with the built in printer in their junk pile?
If so please contact me off line at [EMAIL PROTECTED]
Thanks
Fred
W5VAY
Yahoo! Groups Links
To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/
To
If you want to read a short paper on Lighting Protection and learn; obtain a
GE paper on Living with Lighting by Kenneth Guthrie. After Ken retired
from GE, he taught a course at George Washington University on Lighting
Protection. Ken has passed away some years ago but his works still remain an
You hit it squarely on the head! A PROPERLY INSTALLED CONNECTOR!
Both are good when installed correctly. It is amazing that some techs do not
know how to solder correctly and some will use any crimp tool to get the job
done in a hurry.
With one exception, a crimp connector will not last as long
Ralph: You do not say what you are using for a CTCSS decoder. If you are
using the normal GE MII decoder circuit board; The first LSI module in the
audio path has an active Low Pass filter as a part of the circuit. I have
seen this circuit become defective and pass all audio components; in which
Mat: You don't say how you are using the M-Pro Rx. The Vol/Sq Hi point is
the best point to get audio from the Rx on older M-Pro Rx, if you have a
plug in card shelf with a remote audio card in it, the 600 ohm line output
is a better source of audio as it is already de-emphasized. If you are
Kevin: You may want to copy this for the repeater
files.
For those of you that would like to learn more
about the technical details of a ferro-resonant transformer, Sola has a pdf
format 3 page write up on them.
http://www.sola-hevi-duty.com/products/powerconditioning/pdfs/opchars.pdf
Its not that they do not know how to install it correctly!
They just do not want to take the time to do the job correctly!
Fred
W5VAY
- Original Message -
From: Chuck Kelsey [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, December 17, 2004 11:10 AM
Subject: Re:
Justin: First, Your Vertex rep. is full of it! Look at the power consumption
on the Vertex repeater between AC and DC, especially the Stby/Rec mode. Now
to your question; You have a lot of unanswered questions that need to be
decided before any design can be considered. As a retired engineer I
that were
used origonally to decode DTMF. Now tones are detected by Phase
detectors, some form of FFT in software, or Active filters using
OpAmps. The phase reversal can acheve the same or similar results in
these.
73
Coy
--- In Repeater-Builder@yahoogroups.com, Fred Seamans
[EMAIL PROTECTED
To Jim et all:
Actually there is a reason that Motorola and GE (now M/A-COM ) used a
reverse CTCSS tone burst. The Hi-Q solid state tone detectors that are used
by these manufactures have a ring down time delay, the same as trying to
stop a mechanical reed after removal of the driving tone. The
I would like to offer a few points from working on MII for 35 years. Ex
Engineer retired now!
1. The output Impedance of the MII Amps is a nominal 50 ohms; actually it
varies over quite a wide range and both inductive and capacitive
reactance's. The mfg tolerances of the output transistors could
The GE voter and M's voter both have COR input lines. The status tone is
used when you have a continuous audio path between the voter and the voter
Rx; Ex: Telephone lines/ Microwave Mux. When you use a keyed up link you
normally would use the COR line to indicate status.
Fred
- Original
There are some very high quality computer
propagation predicting computer programs available that use USGS data maps.
However these are expensive and only the companies that are into coverage
predicting in a commercial way can afford them. But they are good.
The first paper on VHF and UHF
There is always the delete key It sure takes a long time to push it ---
whoops its gone!
Fred
- Original Message -
From: Eric Struble [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Friday, May 28, 2004 1:48 PM
Subject: [Repeater-Builder] FBI Release (It's Getting Old
Gentleman: I have two 4CX300A tubes that I will be
putting on EBAY in the near future. Thought I would see if anybody in the
repeater group might want to buy them. They are new in original box, never used,
however they are code dated 7928 ( manufactured the 28 week of 1979
).
If anyone is
Gentleman: Do any of you have an old GE Mastr-Pro
Control Shelf (19D416725G1) with Repeater Control (19D416656XX), Audio Board
(19D416667XX) and Intercom Board (19D416758XX) setting in your junk pile. If you
do and would be willing to part with it, please contact me at [EMAIL PROTECTED].
A few comments from a retired
engineer.
Discussion on Modulation Process: I would offer a
simple explanation with out getting into the mathematics for the non-engineering
professionals in the group. FM and PM refers only to the modulation process in
the transmitter. FM is where the
The design of noise blankers were to eliminate the
impulse noise of our wonderful automobiles. Most noise blankers use a separate
RF front end on a frequency 5 or more Mhz removed from the main receiver
frequency. When the noise reaches a predetermined design level of blanking the
noise
Z-Matcher Information: The Z-Matchers were not included
with GE repeaters until they documented that the had a problem with Hi-Q
reactive loads (e.g.: Duplexers). This did not happen until 1978. At first the
Z-Matchers were supplied by Decibel Products and later GE put their own
Z-Matcher
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