Batboard

Andy Corbin

Jim, makes sense to me. I have not dealt with MDC on any of my GM300's. If you have no need for MDC in your particular application, make a copy of your current codeplug, then delete the MDC and see what happens. One thing I hated about the GM300, when I am loading a codeplug, the data transfer meter...

Andy Corbin

My guess is it is some sort of scanning receiver that may be used in a place like a fire station to activate lights and/or horn. The multi-plug on the side near the crystals may be the decoder output to turn on various circuits. The SIMUL/NORM selector probably selects the channels from a scan list ...

Andy Corbin

A couple of thoughts. 1-What level is the power set? (15 watts, 25 watts, 40 watts, etc) 2-What is the current capability of the power supply? 3-What gauge and how long of a power cord? 4-Have you checked SWR on the antenna? Possibilities are its a 25 watt PA and you are driving it to the maximum or...

Andy Corbin

Another thing you could try is DeOxit on a Q-tip to clean the switch components (CB trace and the button contact). All the techs I know swear by DeOxit.

Andy
W4KDN

Andy Corbin

Tech support said a full cal was about $400.
AC

Andy Corbin

JRY Update- I spoke with Ramsey tech support this morning. I can now get into the power adjustment part of the firmware, but after speaking with them, I am not about to go in there messing around (1) I was told there was a specific power meter (can't remember make/model) which can communicate with t...

Andy Corbin

I did enter the transmit frequency of the transmitter under test. You are probably correct in that the "power" cal procedure is complex and/or needs special equipment. I have the user manual for this unit. I have found this unit to be not-so-intuitive so the user manual is an absolute MUST...

Andy Corbin

Update- I just checked the power reading on the Struthers, Bird Termaline, and the Ramsey COM3010. I used a Standard C5900 on 445mhz on high power. Struthers-28.4 watts/Termaline-26 watts/ 3010-37.8watts. Seems the monitor is reading about 25% higher than the other two meters regardless of power lev...

Andy Corbin

Hi jry and thanks for the response. I was using an Icom T-90 HT. I checked it against my Struthers (aka Bird 43) and my Bird Termaline meter. They were showing abt 3.5 watts while the 3010 was showing about 4.3 watts. Not a huge difference in the scheme of things but if it was an easy adjustment, I ...

Andy Corbin

I recently borrowed a Ramsey Com3010 service monitor for evaluation. If you had previous experience with the "COM3" the COM3010 is a whole new ball game. I have been going through the 3010 calibrating the time base and evaluating various other parameters. There is a section in the firmware...

Andy Corbin

Thanks. A friend and I were discussing and were just curious.

Andy
W4KDN

Andy Corbin

Had a discussion this morning with a friend of mine regarding the Mother M GR300 repeaters. These units came in a variety of configurations which included VHF or UHF, different radios such as GM300, M120's, etc. Our conversation migrated towards the original cost of these machines. Anyone remember w...

Andy Corbin

Just got an HP8920 monitor and have been getting used to it. Seems to be a pretty nice box. It has a front panel mike jack and I was wondering if anyone might have a compatible mike they are willing to part with for a reasonable price. A cursory search revealed on company that had one listed and I m...

Andy Corbin

I am not using PL. No need to since the "reporting" function is transmit only. I can set the unit to report on demand but for now it is on a stand alone txmtr beaconing every hour. I am not going to leave it on beacon mode permanently, just during this testing phase. With the lower deviati...

Andy Corbin

Thanks for the responses. I had looked around online and did some searching, hoping to find a hardpot control. This involves a project I am working on. I have a weather station at the house. The device I have takes the serial data from the console and converts it into spoke weather parameters, (temp...

Andy Corbin

Actually this is a VHF unit. I don't really want to adjust deviation. Already did that through RSS.

Andy Corbin

Is anyone aware of a mike gain control on the GM300 line? I know there are hardpots for other functions.
tnx
Andy

Andy Corbin

Thanks for the info.

AC

Andy Corbin

I received a VHF CM300 for service. Complaint was the radio would not turn on. Problem was verified and power to the radio was OK. I noted when I got the radio on my test bench, when I applied power and turned the power switch on, I could detect a low level "hiss" sound through the speaker...

Andy Corbin

I had a problem with the CRT display on my R2400. Turned it on one day and it was way off. Either the trace was all the way to the top of the screen or I could only see a little of it. I immediately thought I would need a new CRT. What I discovered was, I had set my magnetic parts dish on top of the...

Andy Corbin

Not sure if this is the right place to start this topic, but here goes. Heavy duty tornado damage to the Hara Arena in Dayton Ohio last night. I know there are a lot of Ham operators on Batwing and have been to the Hara many times in the past for Hamvention before it was moved to Xenia. If there was...

Andy Corbin

Try Kurt and KG Electronics. http://www.kgelectronics.com/

Andy

Andy Corbin

Does the transmit tone on the GM300 open the repeater? Also, if you have an HT or another radio or even better yet, a service monitor, try setting the repeater output frequency and tone on one of them and see if it opens the receiver.

Andy Corbin

I remember them being on the old PolyCom 4 channel CB's back in the 60's. As I recall, they had a carbon mike element and really crappy audio but the radio had a receiver that was hot as a firecracker.

Andy Corbin

jackhackett wrote:For those who didn't notice what was funny about the mic in the Dumont radio picture.. someone put the hangup button on the front.

Didn't pay any attention to that but looking again, I notice the mike hangup clip is attached to the bottom of the control head.

Andy Corbin

It is a screenshot from the episode you mentioned, towards the end and it was very quick so I had to do a freeze frame for the capture. I don't see any markings on it. It sort of reminded me of one of the old "Link" control heads but they date back to the 40's & 50's. Also reminded me...

Andy Corbin

It is a screenshot from the episode you mentioned, towards the end and it was very quick so I had to do a freeze frame for the capture. I don't see any markings on it. It sort of reminded me of one of the old "Link" control heads but they date back to the 40's & 50's. Also reminded me ...

Andy Corbin

Is this the control head you are speaking of?
http://s918.photobucket.com/user/1hogri ... 3.jpg.html

Andy Corbin

Take a look here. Scroll down to the very bottom of the page and there is a section on old Motorola mobiles and their respective control heads, and there is also several sections on California HP radio systems.
http://www.repeater-builder.com/rbtip/mojoindex.html

Andy Corbin

This is sort of tongue in cheek.

https://www.youtube.com/watch?v=kZCDBsBuhmg
https://www.youtube.com/watch?v=E3_cAdnAiIU

Andy Corbin

Is this the same battery pack shell that is used in the IFR500? If so, and you were able to get the shell, could you have a shell built using a 3D printer? If that is the case, I have an IFR500 and perhaps could lend you the shell for such purpose. I would absolutely need to have the shell back thou...

Andy Corbin

Check with Kurt Graber at http://kgelectronics.com/. He is top notch on the IFR 1200 and 500.

Andy

Andy Corbin

I'm having a heck of a time finding a 24 hour, digital LED, atomic clock for a reasonable price. Those of you who do dispatch installs, do you have any suggestions? If after considering all the comments and suggestions it still has to be an LED atomic clock, you might check this out. Just my opinio...

Andy Corbin

I'm having a heck of a time finding a 24 hour, digital LED, atomic clock for a reasonable price. Those of you who do dispatch installs, do you have any suggestions? If after considering all the comments and suggestions it still has to be an LED atomic clock, you might check this out. Just my opinio...

Andy Corbin

I should mention, this is going into a Command Post, not a dispatch center. Just looking for something to mount on the wall and when power is turned on to the command post the clock syncs with the NIST Atomic Signal from Colorado. Just a note on this. If you get a clock that is going in a (mobile?)...

Andy Corbin

FWIW, I seem to remember a Larsen NMO-150 cut to 146 was resonant of 6 meters. Can't recall whether I actually did that or was told. Been awhile since I have dealt with that breed of larsen.

Andy

Andy Corbin

Might try pulling and re-seating the boards, cleaning the contacts with some De-Oxit while its out. The CR2325 battery only holds the memory values such as programmed frequencies, PL tones, etc. If the battery goes dead you get a "Check Sum Error" or something like that. Doesn't affect the...

Andy Corbin

An update for those who might be interested. The desense is now gone. I have not been up to the site for any measurements but receiver performance is back to being great. The Chief Engineer for the site is a good friend and he told me awhile back he was doing some renovation and overhauling at the s...

Andy Corbin

Sorry about resurrecting a ten year old thread. I'm searching for a PX300 battery case. I own a working PT500 and a few PT200's. I've noticed the battery for the PX300 is about an inch smaller in width so I'm in search of a PX300 battery. It does not matter if it's dry cell (D cells) or a rechargea...

Andy Corbin

The outlet is in a Jotto Desk console. What concerns me, this is the second car this has occurred in. I have suggested inspecting every car in the fleet with this power port configuration. The powers that be agree with me. Whether they go through with it.......? Also, inspection of the connecting pi...

Andy Corbin

After working at the PD for 33 years and retiring, I got a call a few months ago to see if I was interested in some part time work working on radios, radars, lights, sirens, etc. I took the job. I know I won't get rich doing it, but its something to do and I get a little extra folding money. I went ...

Andy Corbin

This thread certainly piqued my interest so I looked up the auction to review any other pictures. While some components on the chassis are labeled "Motorola", one picture showed a label on the back with "Michigan Electronics" and a Chicago, Ill, address. The microphone is Motorol...

Andy Corbin

Update on my desense issues. I located the source of the RF incursion and it is the 25 watt FM translator (98.5mhz) in the building. I also found some other issues as well. This time I took a spectrum analyzer with me as well as a couple of portable frequency counters. The building is hot with RF fr...

Andy Corbin

By golly, the frequency is indeed 163 and not 162......thats what I get for replying to a message before the morning caffeine fix.

Andy

Andy Corbin

I don't know if it is actually a "transceiver". The tag indicates it is a transmitter. Interesting it is set for what is now one of the NOAA weather frequencies.

Andy

Andy Corbin

Thanks to all for the wealth of knowledge you are willing to share. One thing I have learned is the repeater antenna is directly above the translator antenna with a separation of about 15 ft. The translator is showing 24 watts out on the status display. I may try moving the repeater antenna over to ...

Andy Corbin

radiokid wrote:Have you tested receiver sensitivity with transmitter off?

Yes. Receive sensitivity is about -123dBm (little less than .2uv). Also tested it on the bench with transmitter into a dummy load. Receiver still at -123dBm.

Andy

Andy Corbin

I have a significant repeater de-sense issue and am open to suggestions. First a run down on the system- Motorola GR300 (Two GM300's tied together) on VHF. Using a Linker Controller. Transmit power is about 40 watts and the repeater is well cooled with a fan that runs continuously. Additionally, I t...

Andy Corbin

Have you confirmed the radio is transmitting on the proper repeater input frequency? You can easily verify this with a frequency counter or a service monitor. I doubt the housing has much to do with it since it is the same housing on simplex as it is on the repeater.

Andy Corbin

This is a peculiar anomaly to the Maxtrac/Radius (GM300) style radios. I can't explain why it does this, but I have seen the same thing when working with GM300's. Additionally, I have been told these radios may tend to get a bit more "dirty" as you throttle back the power.

Andy

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