A better source...
Buy the 100 watt UHF Mitrek Mobiles when you can find them.
The PA is a near exact duplicate of the MSR UHF 110 unit.
After having done it many times... it will still take you
at least 2.5+ hours to do the swap if you have every tool and
trick ready to go. I wouldn't
Re: Interference on a 6 meter repeater
That's odd that the cavity in the telemetry radio feed didn't
change things, but it goes away when the radio is disconnected
from the antenna.
I'm surprised how many people feel cavities (the typical cavity
filter) are sure-fire cure-all medicine.
Hi Mick and group.
I have found from the manual for the 38A on the groups web site that the RS232
port is wired non-standard (3-2, 4-3, 5-5 with pc 4-6 7-9 linked) and can now
access the port with 9k6, but it has been set up by a company and has its own
password and the default does not work.
We have experienced a similar issue when outside temps get cold, below
-10F to -20F or colder (straight temps...not the wind-chill).
Once it warms up, the issue goes away.
We aren't 100% sure what causes it, but we have a strong hunch that the
hard-line is contracting unequally on particular bend
Good Point. I may have inadvertently done this test while doing
something else. One of the hams at the repeater site noticed that
turning off the Yaesu telemetery transceiver did not make the problem go
away. He used the ON/OFF switch on the front of the radio to turn it
off. I believe
Thanks a lot Eric I appreciate your Help, I use to work with Motorola at the
plantation Depot.
73 de W4CSO
- Original Message -
From: Eric Lemmon
To: Repeater-Builder@yahoogroups.com
Sent: Monday, February 11, 2008 9:02 PM
Subject: RE: [Repeater-Builder] OT Motorola Power
Fellow Repeater Builders:
Does anyone know the length of the RF cables used in the GR300 repeater
housing? I'm expecting to take delivery of a used unit shortly, but
want to order a new set of cables in advance of delivery.
I need the following cable lengths. Thanks.
1) Tx radio to internal
Re: Interference on a 6 meter repeater
You are living one of my past nightmares... Let me give you
the probable fix first.
If you have them, try a number of attenuator pads in series with
the Yaesu Radio. First might be a 10 dB pad and back the values
down while testing for grunge.
I
If there is a password installed in the panel, the best way would be to
remove the PROM IC from it's backup battery. This will bring everything
back to factory default.
Depending on the age of the PC board, the PROM had different
configurations and locations. Generally it is a smaller IC in a
Another point. The only change I saw when the cavity was inline is that
it cleaned up reception for the telemetry system. This is going to be
my selling point to allow us to keep the filter on the water company
telemetry system. They had some minor adjacent channel interference
73, Joe,
Got to one of the sites today, and it was still cold and not
transmitting. I carefully applied heat from a trouble light to
various sections of the transmitter while noting power output behavior.
I believe I may have narrowed it down to the oscillator section,
specifically the oscillator
ebay item # 220199578266
--
Jay Urish W5GM ex. KB5VPS
ARRL Life MemberDenton County ARRL VEC
N5ERS VP/Trustee
Monitoring 444.850 PL-88.5 146.92 PL-110.9
Good Afternoon,
I have an MSR2000 UHF 100w PA that died. One of the two resistors that
balances the three M2502 final transistors fried, and I suspect one or
more of the three transistors failed.
Anyone repair the 100w UHF PAs before? I tried to find the M2502 from
RF Parts and a few other
Hi Skipp,
Thanks for the suggestion on stealing the parts from a Mitrek. Been
there - done that on a number of VHF Micors, but I wasn't sure if
the Mitrek used the same devices as the MSR's UHF PA.
Anyway, good news. I found the trouble with PA. Evidently, the trace
on the combiner
Ah- I should have recognized the R prefix as an item of test equipment.
Anyway, the manual for the R1011B power supply is part number 6881094A94,
still in print, for about $25 from Motorola Parts.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
Tony,
The cables used in the HKN9235 Internal Duplexer Cable Kit are not
fabricated to meet any technical requirement; they are simply made long
enough to fit with only a little slack. The GR1225 desktop repeater uses
the same cable kit, which you can purchase for about $40 from Motorola
Parts.
Hi Skip and Joe,
Yes, placing attenuators in line can tell you a lot about IM and
interference problems.
In Joe's case it would be interesting to know if placing an attenuator
in the antenna line (assuming a shared receive/transmit antenna)
produces an equivalent reduction in the NOAA signal, or
Glad to read you solved the problem... you would do well to
check the harmonic filter if your pa is the A or plain series.
The late B series pa's were much butter'
cheers,
skipp
kk2ed [EMAIL PROTECTED] wrote:
Hi Skipp,
Thanks for the suggestion on stealing the parts from a Mitrek.
Its a bench top DC power supply adjustable from 0~20 Volts DC and 0~5 Amp.
Thanks for the reply.
73 W4CSO
- Original Message -
From: Eric Lemmon
To: Repeater-Builder@yahoogroups.com
Sent: Monday, February 11, 2008 1:08 AM
Subject: RE: [Repeater-Builder] OT Motorola Power
We have two ExecII mobiles in the same set up 2 mtr Rx 70cm Tx. One of them
will quit working when it gets cold. I have seen both low Tx audio and low
power output until it warms up. I haven't been able to be at the site when
it isn't working to try and figure anything out.
John Lock
kf0m at
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