Our club bought a new DB-224E a couple of years ago for around $650 and it has
been a great performer. We oriented the top and bottom dipoles to the north
where we needed the most gain and the two center dipoles to the south where our
primary coverage is required. Our site is on a ridge
The MFJ analyzers have very limited use around an RF active site. Any RF
picked up by the antenna being checked will interfere with the readings on the
analyzer. I even had problems recently trying to check the SWR on a horizontal
loop antenna for HF, when a high power AM broadcasting station
Allan, my mobile radio was a GE Progress line - either 30 or 60 Watts. I had
both and don't remember which I used most of the time.
The antenna at 1000 ft was connected to some kind of commercial solid state
converter (which I don't recall) and 1000 ft of RG-58 (at 10 meters) carried
the
I have used a pair of DR radios in a cross band repeater and all the signals
you will need are present on the DB9 connector. Use the 1200 Baud packet
connections and you will be all set.
Realize that the COS output is an open collector that keys to ground, so you
will have to use a pull up
One of the best working repeaters I have run across was located on the
outskirts of Ft Worth Texas on a 1000 ft tower. It used a single receive
antenna at 1000 ft into a down converter that output on 10 meters. Several 10
meter receivers were connected to the RG-58 downlead in the radio room
I have converted quite a few DB-224 antennas that were originally used in the
155 mHz range down to the 146 mHz range by adding a folded aluminum tubing stub
to the top and bottom of each element. Using the folded tubing from a defunct
TV antenna I flatten about 3 inches on one end and then
Nah - we used GE.
73 - Jim W5ZIT
--- On Sat, 1/9/10, Jeff DePolo j...@broadsci.com wrote:
From: Jeff DePolo j...@broadsci.com
Subject: RE: [Repeater-Builder] FS: *NEW* UHF Motorola Micor repeater on Ham
band
To: Repeater-Builder@yahoogroups.com
Date: Saturday, January 9, 2010, 8:07 AM
Maybe
We use two 6 Volt Golf Cart batteries in series bought from Sams Wholesale to
power a GE Mastr II repeater and GE Mastr II mobile link radio with the amp
disconnected. The audio amp has been disabled on both radios. The angle on
the solar panels was optimized for the winter months. Our
I leave my IDA controller intact, just put the repeat switch in the inhibit
position. All necessary connections can be made to the repeater for an
external controller on the two Molex connectors on the upper left side of the
rear of the chassis. I use the unused frequency select pins to bring
Actually I have had excellent luck with just making sure there is no leakage
from the signal generator or cable to the duplexer when using a talkie as the
receiver for tuning a duplexer. After carefully tuning the pass adjustments,
leave them alone when you have minimum loss and best SWR. The
I use several Z-38A controllers in ham applications. I get around the squelch
crash problem by setting the Z-38A to stop sending a PL tone as soon as a user
unkeys. The short tail is still there from the repeater, but the lack of a
tone to a receiver lets the audio shut off while carrier is
This problem (generating the 90 degree phase shift audio) is all that is
keeping me from an experiment to generate a SSB signal using a little known
technique I ran across in an old QST. It seems that a phase modulated FM
signal can be combined with amplitude modulation with the audio 90
This may have been addressed earlier, and if so I apologize. A GE Mobile Mastr
II will generate an oscillation in the audio output stage if it is not loaded
at all times. I don't remember the beginning of this thread, but if you are
using a GE Mobile radio, this will wind up transmitting a
The old Alinco DR-590 generated a reverse burst. I could always tell when a
station was using one as the squelch noise went away immediately on a PL
controlled repeater.
73 - Jim W5ZIT
--- On Tue, 11/10/09, JOHN MACKEY jmac...@usa.net wrote:
From: JOHN MACKEY jmac...@usa.net
Subject: Re:
Don't forget that the length of the coupling loops inside the cans contributes
to the overall length of the coax. Ideally you would have a quarter wave from
the Tee coupling the two sides of the duplexer together back to each can,
including coupling loops. The idea is to have the pass side
I used an in-band link to couple two VHF repeaters together, and have a Zetron
Z38A controller that allows me to terminate the repeaters transmitted tone as
soon as a user drops the input. That is all it took to keep the two repeaters
happy. I never did have much luck with two users talking
Mike, I think the next step would be to try to get the paging operator to
install an isolator on the output of his VHF pager for a temporary check. If
he has one already, he could try putting two in tandem to increase the
rejection of any RF coming back down the feedline from his antenna.
I operated an RC Aircraft on 53.5 for quite a few years, and the receiver in
the model was wide open. The transmitter used on/off keyed pulses, with the
carrier on the air most of the time and short interruptions (200 milliseconds)
of the carrier being the control method. A reverse pulse
I have a buddy who has a son living about a quarter mile away, and he mounted a
router in a weatherproof fiberglass box on top of his 50 ft tower, and his son
gets a good signal. Getting the router antennas up in the clear was the answer
for that system.
73 - Jim W5ZIT
--- On Tue, 9/8/09,
Good luck on getting any support at all on the RC110. It appears that Ken has
abandoned the folks who bought one of those and you might as well chunk it in
the trash. That is my take on it anyway.
73 - Jim W5ZIT
--- On Tue, 9/8/09, wb7bts wb7...@yahoo.com wrote:
From: wb7bts
One of the local repeater operators used an antenna at the top of a 100 ft
tower that got bent over during last winter storms. He put up a temporary
antenna at the tower base and is experiencing some really bad desense with the
low antenna.
He is using a GE Mastr II base station repeater and
Skipp, I have two VHF repeaters linked in-band. 146.92 with a remote base
radio on the other repeater frequency at 145.45. I use GE Mastr II radios in
both repeaters, and used a modified GE Mastr II mobile radio for the link. I
removed the final amp from the link radio and use the 250 mW
I have modified several of the 155 mHz center frequency DB-224 antennas to the
ham band. I found that it takes a 2 inch extension to each end of each dipole
to move them down. My mod was done empirically by taking a single dipole and
hooking it to an analyzer and finding the original center
.
Thanks for the tip!!
Tim W5FN
--- In Repeater-Builder@ yahoogroups. com, Jim Brown w5...@... wrote:
I have modified several of the 155 mHz center frequency DB-224 antennas to
the ham band. I found that it takes a 2 inch extension to each end of each
dipole to move them down. My mod
We put a repeater in the equipment room right under the water tank about 150 ft
above the ground back in the 70's. It is a great environment since the water
in the tank is a great heat sink. It assumes the average temp of the outside
air (integrates the temp over months at a time) and keeps
Our engineering prototype parts guy had a sign behind his desk that said:
Failure to plan ahead on your part does not constitute an emergency on my part
73 - Jim W5ZIT
--- On Sun, 8/16/09, Paul Plack pl...@xmission.com wrote:
From: Paul Plack pl...@xmission.com
Subject: Re:
Skip, here is a link to my most recent experience with the TS-64:
http://sbarcnm.org/forum/index.php?action=dlattach;topic=108.0;attach=154
This was the version sold for the GE Mastr II. I had to OR two receivers for
the transmit CTCSS (repeater receiver and link receiver). I used the
One way might be to set the transmitter deviation to 5 kHz for a 2.5 kHz
deviation input signal. Set the VOX threshold to trip at about 3 kHz input
deviation and use it to switch in a 6 dBV pad to cut the deviation back down.
A fast attack VOX with a slow release would keep the audio from
There is a definite dielectric effect for slipping an antenna inside a PVC
pipe. Here are a couple of antennas that I build to insert inside PVC and both
have to be final tuned while inserted inside the support pipe.
http://sbarcnm.org/forum/index.php?topic=83.0
I see that YAHOO added spaces to the links in my last post. Remove the spaces
to make the links work.
73 - Jim W5ZIT
--- On Wed, 8/12/09, Jim Brown w5...@yahoo.com wrote:
From: Jim Brown w5...@yahoo.com
Subject: Re: [Repeater-Builder] Re: 2M Vertical Dipoles
To: Repeater-Builder
I posted a note on this a while back, but will recap here. I mounted four
dipoles from a DB-224 on one leg of two sections of Rhon 25 and mounted the
tower on an antenna range turntable. The pattern was a perfect circle, using
DB Power readings around the 360 degrees. I thought I remembered
A method of taking the COR I have used on a radio that I did not have the
internal schematic is to locate the wires going to the BUSY LED on the front
panel and insert the diode of an Opto Isolator in series with the busy LED and
take the COR from the transistor of the Opto Isolator. You can
I operate an antenna with a full size DB-224 and an 8 dipole 440 antenna on the
same mast and found that the 2 meter transmitter does not bother the 440
receiver, but I do get some desense with the 440 transmitter into the 2 meter
radio. An extra bandpass cavity on the 2 meter receiver cleared
W5FN
--- In Repeater-Builder@ yahoogroups. com, Jim Brown w5...@... wrote:
I operate an antenna with a full size DB-224 and an 8 dipole 440 antenna on
the same mast and found that the 2 meter transmitter does not bother the 440
receiver, but I do get some desense with the 440 transmitter
Dave, I have moved about 5 stations that were in Forrest Service use around 417
mHz, and have a few suggestions.
Buy a mobile 88 split receiver and don't attempt to change the 77 receiver
front end. I modified three of them by removing one quarter turn from each of
the helical resonators, and
I helped a buddy check a set of Sinclair VHF Hybrid Ring duplexers a couple of
years ago, and was really impressed by the performance of that 4 cavity
duplexer. We had +20 dB available at the output of the signal generator and
could not see the bottom of the notches on a 80 dB spectrum
Here are a couple of simple circuits to do what you want. Use a well filtered
source of +V for the audio amplifier to keep from developing some hum on the
output. Any voltage source from +5 to +12 should work. Adjust the variable
resistor to set the gain of the audio amplifier.
73 - Jim
Back when we had to submit an antenna pattern in order to get a repeater
license for the ham bands, I mounted four elements of a DB-224 directly on one
leg of a Rhon 25 tower and mounted the two tower sections on an antenna test
pedestal and ran the pattern. With the antenna sections directly
- Original Message -
From: Jim Brown
To: Repeater-Builder@ yahoogroups. com
Sent: Wednesday, July 01, 2009 6:46 PM
Subject: Re: [Repeater-Builder] DB-224 patterns on side of tower.
Back when we had to submit an antenna pattern in order to get a repeater
license for the ham bands, I
I won't try to argue with you Jeff, but those patterns might still be on file
at the FCC somewhere. This test was done on a professional antenna range by
the same folks who verified all the antennas that we mounted on the airborne
reconnaissance aircraft for the military.
We have mounted
What are you using for a signal generator? Some generators leak a lot of
signal and might have more than .35 uV of signal radiated on the outside of the
coax. When you break the shield path, this higher signal level might get to
the radio.
Another post mentioned that the RCA connector uses a
Wall-Mart sells a pretty good charger for this purpose. It is rated at 2, 4,
or 6 amps (set by push buttons) and falls back to a float charge (13.5 V) after
bringing the battery up to about 14.8 Volts. I have one on the backup battery
for a Mastr II repeater that has a backup circuit built
@ yahoogroups. com, Jim Brown w5...@... wrote:
The first limiter is available on a GE Mastr II on the test socket, and can
be used for signal strength after a signal is well above the noise. Lots of
signals can be copied full quieting before the first limiter starts to show a
reading.
On the P
The first limiter is available on a GE Mastr II on the test socket, and can be
used for signal strength after a signal is well above the noise. Lots of
signals can be copied full quieting before the first limiter starts to show a
reading.
On the P S controller, you have to hook up to the
I have successfully used standard 50 Ohm type N connectors on 75 Ohm CATV
coax. I purchased some brass tubing from a hobby shop that fit the ID of the
center pin of the 50 Ohm connector and sweat soldered a short piece to the
copper clad center conductor on the coax. With this modification
As I recall, an early ARRL VHF manual had a brief chapter on repeaters, and I
believe there were two articles that were of interest. One was the duplexer
and another was a four bay folded dipole antenna for repeater use. If you know
where the four vertical bay antenna article is located, you
We built a duplexer back in the late '70s using sections cut from the refueling
boom from a KC-135 tanker. After cutting the six sections to length, the
inside of the top end had to be machined to be able to insert a cap with the
center tube and coupling loops inside with a tight fit. The
The COR on the Alinco radios is an open collector that goes to ground when a
signal is received. These radios can be configured as back-to-back crossband
repeaters by simply connecting the interface of one radio to the interface of
the other radio.
If you can configure the CAT 1000 for a
I saw this work once back in the '70s when the Ft Worth TX 146.94 repeater was
configured to retransmit the 146.94 output of the Little Rock AR repeater.
This was possible because the Ft Worth repeater receiver was at 1000 ft with
its transmitter at 500 ft. 440 Links back to the control
In the early '70s I coordinated a repeater in Texas(146.985) between a 146.97
repeater in Dallas and a 147.70 repeater near Sherman. One was 50 miles and
the other about 40 miles away. My coordination required that I not have any
complaint from either already established repeater to continue
Actually the Texas band plan was like theirs, my output was on 146.385 with an
input on 146.985 between the 146.97 and 147.00 outputs. Texas did not keep it
for long though, before converting everyone to 20 kHz spacing instead of the
original 30 kHz with the splinters 15 kHz away but upside
I have retuned 10+ GE Mastr II exciters - base/moble and have never had to
change a component. Put the ICOM in for the new frequency and tune per the
manual.
I use a Bird milliWatt meter that has a 250 mW full scale and an internal 50
Ohm load to finish the tuning, after going through the
I have done the mod mentioned on several DB-224 antennas by taking some six
inch lengths of an old TV antenna and flattening about three inches on one end
and wrapping the flattened end around the end of the dipole and putting a
machine screw through the flats to hold the extension to the
- Original Message -
From:
Jim Brown
To: Repeater-Builder@ yahoogroups. com
Sent: Sunday, March 22, 2009 6:13
PM
Subject: Re: [Repeater-Builder] Re:
Decibel dipole array sweeps
I have done the mod mentioned on several DB-224 antennas
by taking
Hey - I thought we were talking about the standard osc/multiplier exciters for
VHF. The only thing I have ever had to do to move a PLL exciter down into the
ham band is replace the aluminum slug in the PLL coil with a ferrite slug. My
installs are non temperature controlled and the temps
wrote:
From: Nate Duehr n...@natetech.com
Subject: Re: [Repeater-Builder] Re: Decibel dipole array sweeps
To: Repeater-Builder@yahoogroups.com
Date: Sunday, March 22, 2009, 5:47 PM
On Mar 22, 2009, at 4:13 PM, Jim Brown wrote:
I have done the mod mentioned on several
We made one back in the '70s from 3/4 inch aluminum angle. We sawed a vee at
each bend point and welded the bent angle back together and made a very stable
element. The dimensions we used were from an old VHF handbook and the elements
were spaced quite a bit farther from the mast than a
The dimensions are in the FILES here on the Repeater-Builder list.
http://f1.grp.yahoofs.com/v1/MPvGSaXwn7VidapqNO9aJxssOWkx7N4yimg7VCgz9rDCxTSilYgmOPHi-yTakY_HTGB5tEDhwoOUFpePfhgiw9oi/db-224e-diagram-dz.pdf
With the luck everyone had with Jeff's link, this one will probably not work.
But look
I had to copy the link and paste it into the browser and then go back through
and take out all the spaces that Yahoo added, but with that done I got back to
the doc OK.
73 - Jim W5ZIT
--- On Sun, 3/22/09, Jim Brown w5...@yahoo.com wrote:
From: Jim Brown w5...@yahoo.com
Subject: Re: [Repeater
I have moved several GE Mastr II 40 watt units up from the 417 mHz area to the
440 mHz area as repeaters. The exciter tunes up OK to the higher frequency,
but the receiver front end and LO multiplier will not tune. I use LOW side
injection for the LO string and modify the helical resonators
In the KISS mode, here is a simple solution that can be used for a trial. At
the receiver site, use a PL decoder to gate audio into a SKYPE port on the
computer at the receive site. Audio would only be present if the receive
signal had the proper tone present.
At the transmit site, use a
I have a remote receiver site at a 900 mHz distribution point where the 2.4 gHz
baseband is distributed down on 900 mHz and the noise is really bad. I can't
copy my repeater to test the remote receiver till I walk about 200 ft from the
tower where the 900 mHz stuff is located.
I have a GE
The rule of thumb we used on the military aircraft RF cabling was that when we
were using a larger sized cable like RG-214 we always used a type N, while if
we were using a smaller cable like RG-142 we used a BNC. I worked on
reconnaissance aircraft for the Air Force and Navy. For video
I bought an IBM 390 laptop on eBay for $9.95 that was advertised without a hard
drive. The vendor responded to a question that I asked about booting to DOS
from a floppy and he indicated that it would.
It has an EPP capable parallel port as well as a standard 9 pin serial port and
I use the
I have posted this info on this list before, but for those who missed it:
Windows 98 has a very usable version of DOS supplied. The only trick is to
boot to the DOS system without ever getting to Windows. To do this simply add
a PAUSE statement as the last line in the autoexec.bat file.
When
I have recently moved a GE Mastr Exec II radio from the 47 mHz area up into six
meters. (The MVP and the Exec use the same exciter). I'll admit that the
exciter is hard to tune, but it will work without any modification. My
technique is to set the frequency of a receiver to each multiplier
I have two PLL exciters in service that were moved from the 170 mHz range down
into the ham band by only replacing the aluminum slug in the coil with a
ferrite slug. One repeater operates at 145.45 mHz and one is at 146.92 mHz. I
have seen no degradation due to operating the bandpass filters
I have three of these preamps in service on GE Mastr II 440 repeaters.
The tuned circuit in front of the transistor will help a bit
with out of band signals.
I build a shield from galvanized flashing and put it around the two turn front
end coil. I use these preamps installed in the normal
My application for a converter box coupon was rejected saying that there were
no more coupons available.
73 - Jim W5ZIT
--- On Mon, 1/5/09, TRACOMM trac...@yahoo.com wrote:
From: TRACOMM trac...@yahoo.com
Subject: [Repeater-Builder] OT- Digital TV converter box issues
To:
I hooked a pair of GM-300s together for a friend who bought a cable off the
internet, and it worked just fine. All I had to do was set the level for
deviation with the pot mounted on the board that also mounts the radio
connector.
The cable he got would cross-band repeat, meaning that it
K3RFI - the ARRL power line noise guru - visited my shack three different times
and showed me how he fingerprints power line noise sources.
When you have arcs from metal parts not directly in contact, the arc starts and
quenches several times for each positive and negative peak on the power
I have a buddy who lives in Maine and moved into a new house a couple of years
ago. He lost power to the house back in the middle of the summer last year and
determined that the problem was somewhere between his house and the power
pole. He started digging up the line and got all the way to
Alex, I operated a CAT300 with a two tone rising bubble up for about 15 years
before linking that controller to another repeater last year. At that time I
changed the CAT300 courtesy beep to a chime since I was getting a two tone DTMF
courtesy beep through the link, indicating that the
Chris, here is a link to a GE Mastr II system I put together last summer. It
uses a CAT300 (an old model without the Link capability) with the RLS board.
http://sbarcnm.org/forum/index.php?topic=108.0
Using the older CAT300, only two remote base connections are available since
there was no
Find the two speaker pins on the audio output module and with the module
removed, check for continuity across the speaker leads. If you check from the
output module end, you will hear the ohm meter put enough current through the
speaker to hear a scratch in the speaker each time you connect
I went a step farther with my handheld Bearcat scanner and placed it in a steel
pie cake pan with a cover I made from aluminum flashing. A few clothes pins
around the cover sealed the signal up so that the only external signal came
from the BNC feed through connector mounted on the side of the
I got a first hand lesson in the technique Burt describes from K3RFI, the ARRL
power line noise guru. He came to my QTH in response to a complaint I filed
with the FCC through ARRL and showed me the 'fingerprint' method he uses to
locate a noise source.
When a breakdown occurs causing an RF
Bob, my impression (I did not make any measurements) was that the short squelch
tail did not change any with the mod. I had a mixture of base station and
mobile squelch modules in my base station repeaters, and the biggest problem I
had was with the base station modules. One of the capacitors
For the GE Mastr II users following this thread, be sure to check the mod shown
here:
http://www.repeater-builder.com/ge/mastrIIsquelchmod.html
I have this mod in all the repeaters I have built and am very pleased with the
operation. It resembles the dual squelch operation of the Micor in
This probably will not work on the Mitrek since it may not use slugs to tune
the coil, but I had a problem with a crystal on a Delta radio that would not go
low enough in frequency. I removed the slug from the F2 coil and ran the slug
for the F1 coil through max inductance and then added the
Here is yet another approach from back in the '70s:
The 146.94 repeater in Ft Worth was located on a 1000 ft tower on the east side
of the city. It utilized a solid state converter for 2 meters down to the 10
meter band where plenty of low band receivers would work. I think it used a
piece
I don't know what type of service monitor you are using, but I tend to use an
iso-tee to measure desense with the duplexer hooked to a dummy load through the
iso-tee. It might be possible for the service monitor to contribute to some
signal reflection if it is used as the power termination.
Both my Motorola Signal Generators developed an intermittent with the 1 kHz
tone and I pulled the units out of the case and cleaned the pins on the PC
cards.
The old red ruby eraser trick worked like a charm. I also found a light
coating of a greasy film on the contacts which I cleaned with a
This one has an easy solution. Use the SignalLink USB interface to get Skype
to your radio. It detects the incoming audio from Skype and keys the
transmitter, and the system is full duplex, so you have receive audio available
back into Skype with no VOX to fool with.
Be sure to secure your
Our club recently bought a cabinet from these folks:
http://www.ddbunlimited.com/OD-50DX-outdoor-nema-enclosures.htm
We were very pleased with the way it was built and is has been in service for
about 3 months now.
Not cheap (around $1500) - but a very good cabinet.
73 - Jim W5ZIT
--- On
Bryan, I can recommend the NHRC-4 controller for the service you want to
implement. I'm not sure but I think the ICS-Basic you mentioned is a repeater
controller that does not have the second port to control your link.
I have built up 3 of the NHRC-4 controller kits and used them in two port
In using the Bird 43 outside the bandpass listed on the slug, I have found that
the meter works very well for tuning an antenna for minimum SWR. The power
readings on the meter are just not accurate when the frequency being measured
is outside the slug bandwidth. I have not gone all the way
You may find that a lot better operation will be had with a VHF antenna used as
a VHF/UHF dual band antenna. The 1/2 wave VHF dipoles are 3/2 wave on UHF and
a current feedpoint is the same point on the dipole on VHF as it is on UHF.
My experience has been on a DB-224 type antenna, but I
)
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, November 18, 2008, 6:56 AM
Jim,
But it will work on the Motorola DTR (digital) FHSS
handheld?
I am worry about the FHSS.
Thanks
- Original Message -
From:
Jim Brown
To: Repeater-Builder
For some PL decoders, a weak noisy signal will trigger the PL detect and let
the signal through. On the other hand, if the co-channel signal happens to be
using the same PL tone, it will get through also. A good PL decoder like the
TS-64 will rarely false.
I have a repeater configured so
Jason, if your duplexer is one of the older units using a dielectric rod to
tune the notch, here is the manual:
http://www.repeater-builder.com/sinclair/q202-208-218-tuning.pdf
I have moved four of these duplexers down into the ham band by changing out the
cable that goes from the cavity to
I was especially interested in the crystal checker. I had never thought about
using an analyzer to check the series resonance of a crystal, but I'll bet it
works just fine. Going to have to build up a little circuit to couple mine to
a crystal through a 50 ohm resistor and get after the
I was especially interested in the crystal checker. I had never thought about
using an analyzer to check the series resonance of a crystal, but I'll bet it
works just fine. Going to have to build up a little circuit to couple mine to
a crystal through a 50 ohm resistor and get after the
I installed a remote receiver for a repeater this last summer at a site where a
900 mHz wireless distribution system, along with a 5.x gHz backbone was
located. The site also had a 2.4 gHz local wireless router installed.
In order to operate the remote receiver the squelch had to be as tight
Our club budgeted for a Kenwood 750 repeater to replace an RCA TAC-200 mobile
repeater we have had in service for 15 years. Replacing it was deemed
necessary since repair parts are no longer available.
I objected to this replacement from the start, wanting to put another GE Mastr
II base
Gervais, take a look at the link below for an interface to EchoLink for one of
the PSE-508 controllers.
http://www.pionsimon.com/w5zit.htm
My original interface used the stock GE Repeater Audio and Repeater Control
cards, and I found that the PSE-508 could be modified the same way. But you
Gervais, Here are the files I could not find to send you before.
73 - Jim W5ZIT
--- On Fri, 11/21/08, gervais fillion [EMAIL PROTECTED] wrote:
From: gervais fillion [EMAIL PROTECTED]
Subject: [Repeater-Builder] Master 2 vhf and a link radio Uhf,How???
To: repeater-builder@yahoogroups.com
Date:
I did not take any pictures Gervais, but the important thing to keep in mind is
that the complete interface to the external radio can be done using the
terminal connections on the rear of the card file. The modifications are only
documented for a PSE-508, but the idea is there to use the two
Andre, a pair of Motorola GM-300 radios can be interconnected as a repeater
using a cable available on eBay for about 10 USD. I have used two radios set
up like this, one as the receive and the other as the transmit and they worked
just fine as a repeater. No squelch tail on the simple cable,
The Texas Packet Radio Society did a conversion for the RCA 500 UHF mobile
radio for 9600 Baud packet back in the '80s. They had a very large network of
radios covering most of Texas with the RCA radios used as the backbone. It was
a pretty simple conversion as I recall, to do direct FM in
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