Just out of curiosity are you performing these tests with a 1000 cycle
tone and if so, have you tried it with no modulation?
It almost sounds like it is going out of the bandpass of the receiver
when you increase the signal level. What happens when you vary the
frequency a few KC higher or lower
For the benefit of everyone on the list let me advise all of you concerning the
new world of Motorola service; at least when compared to the old days when
the MSF5000 was considered the top of the line and the days of antiquity when
the Micor was king. I will not even try to find adjectives to
Don,
Low battery voltage shut-down can be done quite simply using three or
four parts: a normally open contact relay, a resistor, and a cap. The
battery goes to one side of the N. O. contact and the load (repeater?),
power supply, and relay coil to the other N. O. contact. The other side of
Hi Joe,
Yes I did it with a 1000 cycle tone with and with out 1000 cycle but with PL,
You are correct I did try to vary the freq, and to my surprise even apply TX
freq to RX freq that was 5 MHZ difference it still have the same sensitivity,
One thing I did not do is resetting the unit, I am
Hi Milt its nice for your advice,Yes I have work on surface mount way back
maybe 17 years ago at Motorola depot in plantation Florida, and MTR2000 is
totally new to me
and I like to learn something about this unit, I like to remain active so my
old brain won't get frosted, and its boring when
Mike,
Did you just build up these repeaters? If so, you need to remember to install a
load on the audio output of the receiver audio amplifier. This can be placed at
the speaker connections. If there is not an 8 Ohm load on the audio output, it
will produce a low level oscillation in the
If you are concerned about your batteries lasting as long as possible when
running on backup, I would NOT use a relay. Even at 100ma of current draw,
that's a LOT of current in a backup / solar situation. Since the RF PA only
draws current when in transmit, (Class 'C') you can hook it directly
In my long search for UHF Midland XTR Radios I have amassed a large
quantity of Midland radios (And some Johnsons)
Here's a list, I have several of each model except the 526
Midland 70-526BXL may already be sold
Midland 70-1695B
Midland 70-1530B
Midland 70-1595B
Johnson Challenger Plus
I have a number of 900 MHz MSF-5000 repeaters available. These units
are complete and were all in operation at the time they were taken
out of service.
I believe they are all Prom Based and the majority were trunked.
Most units are 75 Watt, however I do have a few 150W versions.
The first 3
anyone on the list have a breakdown,of what the sections are in length ?
I was given one that needs repaired,and cant find anything on the net
that helps me out.I do have a picture of one section thats in dire need
of being fixed.
Ray
N3PYJ
top of antenna to top of first white load... 36 7/8bottom of top white
load to top of bottom white load 29 bottom of lower load to top of
horizontal radials... 31 9/16 hope this helpsallen...
**BUY Indiana Jones and the Kingdom of the Crystal Skull on DVD
I see a lot of discussion about 6m conversions for Maratracs... I'm
curious about using the low-split model (RF board HLB4099) on 10m FM.
The stated range for these units is 29.7 - 36 MHz roughly. Not a
huge stretch down into the 10m repeater band. I have a 10m repeater
in the conceptual
Ray go here __,_._ http://tinyurl.com/5548tq
Download the PDF of the Ant Hope this helps
Happy Repeater Building
Don KA9QJG, ___
Read the MaraTrac articles. Modify the programming software and see how it
works. You might have to add some ferrite cores in the RX front end coils to
bring the sensitivity up a bit at 28 MHz, if you need to go that low, but as
the radio is already spec'd to 29.7 and you probably don't need
Brian,
If you haven't already you will have to edit the band limits in your copy of
the RSS. The procedure
varies depending upon which version of the RSS you're using. You will also have
to realign the radio
a bit but they do work fine on 10m FM. There's info on both Batlabs and the
Maratrac
Thanks to all that replied with suggestions for my linking problem. With
all the answers you gave I was able to resolve the problem. The first
mistake was in one radio I forgot to put a load across the speaker
connections as I wasn't using one. ( the other radio I did. must have been
one of
Mike,
It's good to hear the problem is resolved, but unless you need the local
monitor speaker on a regular basis, it can signifgicantly reduce current
consumption on the receiver to disable the B+ supply to the audio amp, rather
than run it into an audio dummy load.
A set of instructions I
I'm not so sure you have it right yet..
Now you have audio that is not processed, which will bring another wave of
100 helpers.
Don't rush it to the hill. Burn it in - listen to the audio. You may need
some de-emphasis now. Then the old .2 cap and 15K argument will start.
You are
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