Batboard

k2hz

The radio reference Wiki was for "scanners" that do 5 kHz steps. Also scanners have sloppy selectivity so 2.5 kHz off is not too bad but the Maxtrac would probably not like it even if you could enter the 5 kHz frequency.

The "shift" works for out of band frequencies but it can't make the radio do ...

k2hz

I don't have specific info for the CDM1250 but normally the ACC options do not affect the mic input. The intent is to allow data or other applications requiring flat audio to be connected to ACC without affecting the mic audio.

k2hz

The function of pre-emphasis/de-emphasis is to improve SNR on voice transmission by pre-emphasis boosting high frequencies on the TX side so RX de-emphasis rolls off the noise on a non-quieting signal and restores the normal voice frequency response. So both should be on for voice.

If no TX pre ...

k2hz

I have a manual I can scan and send you a PDF. Please PM me with your email.
k2hz

k2hz

One downside of the kd2sl antenna is that it is horizontally polarized as are all "turnstile" type antennas. Horizonal is normal polarization for TV broadcast and also for typical Ham fixed operation but not mobile. Cross polarization can cause major degradation, especially on higher frequencies and ...

k2hz

I recently had a problem with mine after 8 years. Would not power up due to both a power supply and memory backup battery failure. Rick offered me suggestions on components to replace but I elected to send it back to him for both repair and recalibration. Quick turnaround and very reasonable charge ...

k2hz

It may be worthwhile for you to contact Rick Bowman at Amtronix:
http://www.amtronix.com/usequip1.htm

I have a HP 8285A modified to a "poor man's 8920B" purchased from him several years ago and the deal and subsequent support has been outstanding. He has a good stock of used HP units and parts and ...

k2hz

Jerry and his wife Joan ran the business out of their house so it was strictly mail order even for locals. The last time I had any contact with Jerry was several years ago when they advertised a sale of boxes of assorted excess parts inventory at very low prices. I suspected at the time they were ...

k2hz

This is old news. Owner Jerry Vogt was incapacitated in an accident in 2016 and died in November 2017. The website has not been updated since the accident.

http://www.legacy.com/obituaries/democr ... =187343356

k2hz

arlojanis wrote:Another strike against MURS is he wants Motorola radios and they are probably type accepted for MURS.

Take a look at the Motorola RMM2050 MURS radio. It should be perfect for this application.

k2hz

If the system is just portables for in-store use MURS could be a good solution. VHF 2 Watt portables should provide adequate coverage and you will have 5 channels to choose from to avoid local interference. No license or coordination fees.

You are not going to get a clear licensed channel ...

k2hz

I have purchased crystals from ICM to recrystal Micor elements and I found the compensation to be good with the existing element components. Certainly good enough for ham use.

I have several in service in VHF voting receivers in a cabinet at an unheated site that have been in service for several ...

k2hz

I am not familiar with details of the CP200 channel selector circuit but most radios use a 4 bit binary code from the channel selector switch to the CPU.

It is likely that the switch or the connection to the CPU is not providing the binary "1" bit but the binary "2" bit is working. Since Channel 3 ...

k2hz

PM sent.

k2hz

When I bought this monitor I was easily able to find and use the monitor for sweeping/tracking duplexers and after not using it for six months, I can't find the sweep/track function. Anyone out there able to point me to the correct menu selection would be doing me a huge favor.

Dave-k7gdm

Go ...

k2hz

That is a Motorola "Handie Micro Talkie". It is a transmitter only and was generally used for one way communications. I have not seen that model with the pull out antenna before. A model with fixed loop antenna that was also a handle was comon for use in railroad yards.

It is similar to the ...

k2hz

I believe the lamp is in series with the battery to act as a simple current regulator. If so, voltage of the lamp plus the voltage of the battery should be slightly greater than the open circuit output voltage of the charger and the current rating of the lamp should be
slightly greater than the ...

k2hz

I can't find the lamp info for that specific charger but similar chargers of that era for portables like the HT200 used an incandescent lamp as the current limiting device. Some lamp types used were 756, 1819 & 1829 with the desired charge rate apparently determining the lamp type used.

k2hz

Most Motorola radios have the "DOS" feature that mutes the MDC1200 audio other than an initial brief chirp. This is a feature that has to be enabled in the radio programming or your hear the full "squawk". I an not aware of this feature being available on scanners.

k2hz

By "transistorized" do you mean to include the series that used a tube PA?

AFAIK, the "DEN" units I mentioned above were the first that were all solid state.

There was an earlier Dispatcher version, the "BMT" series based on the packsets that my info shows only were available as Low (D31BMT) and ...

k2hz

I am looking at a 1967 Motorla catalog that has the D41/D23/D43DEN series "Dispatchers" that were based on the HT/PT200 portables. There are no UHF "D*4" models listed, only the Low and VHF versions.

This catalog also lists only Low and VHF versions of the PT200/300.

The HT200 and 220 were ...

k2hz

The Metro was what Motorola called "Decimal Digital" which was actually a 5/6 tone format.

k2hz

Since you have not received any specific responses, here is some general info that may help.

I don't have any specific info for your radio but I have successfully removed add-on excryption boards from several other types of radios. Like you, I was unable to get any schematic of the add-ons.

My ...

k2hz

Here is a remote possibility but I have seen it happen a few times -

The cold causes the center conductor of the coax to contract enough to pull the center pin of a type N connector back to the point that the connection is intermittent. Once things warm up - trouble goes away. In the cases ...

k2hz

As you decrease your modulation index much below 1, you begin to lose a great degree of the noise immunity that is a benefit of FM. So, if my old brain remembers correctly, the FM modulation index is deviation divided by the max information frequency? If we keep our max audio frequency at 3 kHz on ...

k2hz

IMHO you can't beat the Kenwood TK-6110 for a solid performing, 70W, Low Band radio. The 35-50 split is a plus compared to 36-42 or 42-50 for most other Low Band units.

k2hz

Hi

I have a Motorola M1225 which I listed for sale and before I send it off I would like to verify the radio can be read and written to. I have the following version:

Motorola Radius 1225 Version 3.1 Release Build 2

DESCRIPTION:
This software is Version 3.0 of the 1225 Series RSS. It supports ...

k2hz

One additional complication with the MT500 is that it uses channel elements so you would need to rebuild the channel elements with new crystals.

When you say the ham crystals are easily obtainable do you mean for normal ham units and not the HT220? Motorola commerical radios use different ...

k2hz

FMTR-140D Low Band and FMTRU-80D High Band (1962)

I also had a FMAR-13V reciever part of the original two piece mobile FMT/FMR series.

k2hz

I believe the MCR-100 uses channel elements and is not programable.

You can get the existing channel elements recrystalled but it is expensive. ICM is the best source I am aware of.

k2hz

southerngent wrote:Would be interesting to find some kind of manual or paperwork on this unit to see what it was intended to be used for...oh well

This link fully describes the system. The dial is for the "IPS Code".

http://www.info4u.us/HEAR_Program.pdf

k2hz

,just asking myself why someone would go to the trouble of installing a rotary phone dial on a unit that would not accept it.....strange!...would have made a great conversation piece.

The T-1611 was used for the HEAR -Hospital Emergency Administration Radio - system that was an emergency radio ...

k2hz

Brings back memories of MTS and IMTS...
I used to make a box called ChannelGrabber for IMTS users.
I worked for an IMTS carrier and we upgraded to a Glenayre terminal with anti-ChannelGraber firmware much to the consternation of a vendor whos users phones now had great difficulty connecting.

The ...

k2hz

As I mentioned in my reply to your post about the console, I have never seen single tone used and I have been involved with 2-way since 1962. The odd thing about your console is that is specifically for control of a PL base with the optional current generator to provide the reverse current monitor ...

k2hz

That IS a T13xx series DC Remote Control Console. It also has a line operated TX indicator, probably used on the same line as another remote.
From the circuit boards shown it is probably a T1398AM 2 frequency DC remote for a PL base station.

The Line Current board supports reverse line current ...

k2hz

The console version of the 1300 series remotes includes the T1336,1367 and T-1390 series.
All match the physical description of what you have. The general 1300 series also included the telephone type units.

The consoles have a speaker with power and volume knobs beneath it on the right.
There is a ...

k2hz

You would need a DC Remote Adapter such as a CPI Communications DTP Series added to the mobile.

k2hz

I think there is a perception that DPL has some advantages over PL such as more available codes and possibly better
performance at the lower deviation levels.

Switching from PL to DPL in the past was not always an easy option since some older radios could not do DPL. With the change to all NB ...

k2hz

Doesn't make a lot of sense that business and IG's would take that long unless they really have a back log of processing the fee exemption requests.
I think the fee exemption is the issue. I submitted an application on 4/16 with a Fee Exemption attachment. it was "Offlined for Attachment Review ...

k2hz

I had been buying ProStar NIMH batteries for Genesis series radio for many years and they were great up until about 2010. Since then they have consistently failed suddenly after 13-15 months of use. I have some ProStar batteries from 2007-2010 still in service that are fine but every one purchased ...

k2hz

The receiver is SSB only. The "AME" mode is H3E that is SSB with reinserted carrier that was used mainly during the transition from AM to SSB in the maritime services years ago so that the SSB signals could be received on an AM receiver. It was used for distress situations on 2182kHz to insure the ...

k2hz

I just got this charger from a local shop on a trade. All LEDS flash in sequence upon power up- I'm pretty certain that's normal. But when a battery is inserted, it just flashes red like it's a bad battery. Every charger slot does it. My batteries are good enough that they'll charge in other ...

k2hz

Hello :
Just an update on the fcc saying 90 days back log on the modifications on wide band to narrow band.
Some said they got theirs granted fairly quick but my license with fee exemption attachment - still after 2 1/2 days says pending.
Ill keep an eye on it and post back when it gets looked at ...

k2hz

I have not asked about input voltage yet. My bench supply only goes up to 40 volts. Do you think 40 volts will start the 72 volt supply?
I just tried a RR Spectra on my bench and it will start as low as about 36 V. Below that it tries to start but acts flaky. I assume if I tried to TX it would ...

k2hz

Hello :
Just an update on the fcc saying 90 days back log on the modifications on wide band to narrow band.
Some said they got theirs granted fairly quick but my license with fee exemption attachment - still after 2 1/2 days says pending.
Ill keep an eye on it and post back when it gets looked at ...

k2hz

Circlebat..sorry about the delay...busy with other work.
I am not sure exactly, but they talk to the Maxars and I think they are 151Mhz...
The model number code says the "middle" frequencies, which are apparently 136- to 174 Mhz

That helps any?
Jim
The manual for the D33TSA3300 is 68P81037E95 ...

k2hz

I have the manual in front of me and I think I found the part in question:

c168 23-84538G06 47uF +/- 20% 20V

It is on the line from the collector of Power Control Driver Q 802 to the output of the Exciter Power Amp through L124. The collector of the Amp Q122 goes through L123 to the junction of ...

k2hz

. It doesn't have to be that way, if you believe Shannon and Nyquist and information theory

That is true in terms of the capability of the system to transmit information but there are other factors in the quality of the received signal. A significant advantage of FM over AM is the quieting and ...

k2hz

I don't beleive the FCC has changed any technical standards on ERP for narrow band.

It would take at least 3db increase in power to make any perceptible change in the received signal quality. More would be needed to make a significant improvement. TX power increase is not usually a practical ...

k2hz

I suspect they might be an early model before Motorola came out with the full 146-174 bandsplit version. It sounds like they may have attempted to stretch the spread of the early 157-174 split for users that needed both Federal Govt and civilian Public Safety in one radio.

I can't find a manual ...

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