Batboard

Al

Can you tell us how you're measuring the audio output power? The CM series has a single IC that's in a BTL configuration, so within the design limits of the IC, the output power that you'll measure across a specific value of load resistance is inversely proportional to the load's value.

Al

As I recall, there was a problem with old versions of the radio firmware that caused this to occur. What is the firmware revision in your HT? If it's really old, flashing with the newest firmware will correct the problem, and that can be done local to you.

Al

My distributor advised today that Min Vs have resumed shipping from M. The current design has a metal(aluminum) battery latch and properly sized rear housing, so no more sticky/stuck battery packs.

Al

Without listening, I'm guessing it sounds like the proverbial record player needle jumping in the record's groove. If that's what it is, then it's the "lookback" to F1 dead time caused by priority scan on F1 being active. If you change to probability scan it'll go away.

Al

I think that I've got information on the various packet types and formats, but I've never seen any readily available software that will decode packets. With MOSCAD, the packet contents are pretty much unique to each system. How good are you at writing C/C++ code?

Al

Propagation characteristics of VHF vs. UHF for users in hilly/mountainous terrain?

Al

You didn't say what speed the processors in the various PCs you're trying to use is. Generally, with all but the very last version of the RSS, you need a processor speed of no more than 16 Mhz, and preferably an old 286 or 386 Intel processor. The last version of the RSS accomodated higher processor...

Al

Same thing happens following any war or U.S. military action on foreign soil. WWII radio stuff was available on the surplus market(stuff that was stocked in this country by the military and bid out) but never used) for 30 years. It's only good tactical to make sure that your armament/communications ...

Al

Tom,

The frequency the OP gave is not evenly divisible by either 6.25 khz or 3.125 khz.

Al

155.8525 Mhz is not a valid 25 or 12.5 Khz assignment. .8525 falls 25 Khz above and 10 Khz below the valid assignments or 155.8500, 155.8625, 155.8750. Are you sure you don't really want to program 155.8625(which is evenly divisible by 12.5 Khz)?

Al

See here: http://www.batlabs.com/ht50pin.html

Al

Your message will stay in your outbox until the recipient receives it. When he does, it gets put into your sent box.

Al

The most recent information that I have from my paging distributor is that the problems were not with batteries, but rather the rear housing on the Minitor V(the factory molds were worn and as a result the batteries were nearly impossible to remove once they were inserted into the pager back housing).

Al

I've repaired a few, too, with bent pins(sticking) and a few others with very minor liquid damage. I've never seen a schematic for these, and they're fairly complex with switching regulators and sophisticated battery charge sensing circuits, so local repair here is limited in scope. Because of the r...

Al

The problem lies within the pager's charging circuitry, not the charger in most cases. Unless you want to void the IS rating, assuming that you're not a FM approved shop, the depot is the answer.

Al

That's the one....under the removable cover(I was remembering that it was inside the box, and didn't remember the removable cover). There's only one, and that's *it*. If you put a milliammeter across the tip and sleeve of the smaller of the two plugs on the radio connector, you should see -8 or -9 m...

Al

I've never had a problem getting the CPs into bootstrap mode with the same flashing adapter that you're using. Have you tried opening it up and checking the internal 9V battery? If the battery's dead, you'll never get it into [re]flash mode.

Al

What version of the Global Tuner are you using? R02.15.00 is the latest. According to a post from AlexR in the thread that you referenced earlier, using the latest Tuner solved the problem for him.

Al

Mot placed a temporary ship hold(stopped shipping) on the Min Vs for a few weeks in May to correct a design problem with the battery circuitry, and shipments resumed at the end of May.

Al

Bill is correct - the receive sensitivity specs are published in the literature. To answer your question directly(although I'm not sure it means much to you), the specs typically call for 0.25 to 0.35 uV for 10 dB sinad(depending on the frequency band), and this equates to signal levels of -116.1 dB...

Al

Assuming that the radio hasn't been dropped or received a severe physical shock, the next place to check should be the on-off switch portion of the volume control/switch. Once again, you have to remove the front housing then remove the PC board from the chassis to access the switch contacts. If the ...

Al

Is the Tx power output really *0*, or some low value such as 400-600 Mw? An indication of a very low value would likely tell you that your PC board has an LDMOS PA vice bipolar, and the LDMOS is very sensitive to complete or partial destruction because the forward gate bias is incorrect(which may ha...

Al

And if you prefer or need the ones with 12 ga. conductors vice the ones more commonly available with 14 or 16 ga conductors, try www.partsexpress.com in Ohio.

Al

Defective transmitter PA, more than likely. What is the transmit current draw?

Al

To determine whether the display is working properly, put the HT in button test mode. Within 5 seconds after powerup, push side button 2 five times. Then hold SB2 in until display shows "LCD test". Push SB1 repeatedly until "icon test" appears in display, then push SB1 until all ...

Al

Thank you, escomm....I was thinking of the 1550 which does indeed support 128 personalities. The CDM1250 supports only 64.

Al

If you have a conventional CDM(not an LS or LS+) the radio is capable of 8 zones of 16 frequencies per zone or 128 frequencies total. All you have to do is create additional zones in the CPS and populate them with the personalities you wish.

Al

Examine the accessory contacts closely on the side of the HT for any darkening of the gold plate, greenish discoloration, or other signs of dirt. Clean contacts with Deoxit ProGold or similar, then retry the read with your CPS. The gold plate is so thin on the contact areas that I wouldn't attempt c...

Al

Likely what's causing the clicking noise you're hearing is not the control itself, but rather the shaft of the control 'sticking' on the silicone rubber seal that it passes through in the control top. After removing the shaft knob, a tiny amount of silicone grease applied with the tip of a toothpick...

Al

The only Maxtracs that I have seen that read a 320 block codeplug are trunking radios. Is it possible that yours was converted from a trunking radio or has trunking firmware on the eprom?

Al

For troubleshooting purposes, have you tried inserting your IP addresses into the hosts file? It's at \windows\system32\drivers\etc. IE8 always looks at the hosts file first before it tries to resolve the IP you've given it....so your entry would look like: canopyxxx 66.88.xx.xx. If the above fails,...

Al

Correct, 4 & 7.

Al

Unless you cannot run the windows version for some reason I know of no way to do what you want to do. The windows wersion is available for free download from one of the Motorola websites. Is there any reason you can't use the windows version?

Al

Try searching here for "Minitor IV engineering mode", and I think you'll find the answers you're looking for.

Al

If the unit waas in "bad shape" due to a fall, be sure to check the 14 Mhz crystal for normal and on-frequency output. If the PA bias was set too high, the radio could draw 1.2 amps with no RF drive to the PA. I know you stated that the RX was OK....is it "really" normal i.e. on ...

Al

They both take the same standalone charger.

Al

Did you really mean *CB* channels(as in Citizen's Band, US)? If so, I think you'll find that CB transceivers employ AM, and the MCS2000 is an FM only transceiver. That might explain why your transmit carrier appears to have no audio on the received carrier. And if you're located in the US or its pos...

Al

There's a 10.5 ft long coilcord available for the Maxtracs, HLN9560A, list $14.75(the regular one is 7 ft.). It has the RJ11 connector with strain relief molded onto it, just like the one originally supplied with the HMN1035_ mics.

Al

If I remember, the PA LDMOS in the Waris portables is a 7 watt transistor, so it should operate at 5-5.5W OK. Do you have good confidence in your test equipment accuracy when you set the portables for 4W output? I've got 200 or so of these Waris portables in a *heavy* industrial environment, and the...

Al

Unlike the Waris mobiles, the Waris portables do not have a PA shutdown switch. I've never heard of any problems involving bad PAs caused by chargers creating voltage spikes. I've seen many fail due to inadequate or no heat sink pad between the chassis and heat spreader soldered to the PCB. I've had...

Al

Be sure to program the HT for *no* preemphasis on transmit....the 6 dB/octave internal preemphasis will do nasty things to the squarewave generated by your encoder that pocsag pagers won't like. And keep the deviation to within +/- 4.5 Khz on your carrier so the transmit emissions fall below the emi...

Al

If you can't force a failure, it may be wise to reflash with the current firmware(R05.09.14) after saving the tuning data and codeplug. Maybe someone else has seen the HC error that you report, and I'm sure they'll chime in if they have.

Al

Can you tell us what version of the firmware is currently loaded?

Al

1. Push side button 2(below the PTT) five times within 10 seconds after powering up. 2. Push and hold SB2 until you see "LCD test" appear on the display 3. Push SB1(top, above PTT) to illuminate each block of pixels in the display(if everything's OK, you should see rectangular blocks of pi...

Al

HC error is not listed in the basic service manual along with the HW and CS errors. Did you put the radio in button test mode and check that all display characters are working?

Al

If the receivers are a poorly designed as you indicated earlier, I'd be willing to bet that your interference/overload source is **way** out-of-band. Do you have a cavity type RF preselector filter(read - narrow) that you could insert in front of the receiver just long enough to verify whether or no...

Al

Could be that they're selling off their stock of E versions or that the E is not completely compatible in all applications with the G version. With the complete housings for the HT750, for example, they're up to G revisions, but some of the parts(i.e. O rings, control top seals, etc.) are not comple...

Al

The 'G' version is just a later revision with improvements over the 'E' version. Conv-epp says that the housing is for conventional units, epp=environmentally preferred product.

Al

You can easily do more damage that will destroy the transmitter PA by using an .sfp file that was written for another HT1250. The correct way to remedy is to realign the portable with the correct test equipment and then ***pay attention*** SAVE the tuning data to an .sfp file.

Al

I've still got 10 each of the M9649 and M9648, and the M9807 is still orderable from Mot as p/n 4800869807 for $4.18 ea. list.
Probably the best place to find the other three is an MSS that's been in business for a long time.

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