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WB6DGN

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Tom WB6DGN

WB6DGN

Please let us know what you find. Handy to have in the "memory banks" for future use.
Tom

WB6DGN

Am I missing something here? Seems obvious to me; buy a crimp-on miniU connector for your existing cable and install it OR buy a Motorola (or other) NMO base with the miniU connector installed and, preferably, the white high frequency antenna cable. What's your time worth? Easier and not very expens...

WB6DGN

Sorry it took so long for me to reply; those flexes were pretty well hidden among my stuff. The only chip cap I see, and, I'm sure, the one you're referring to is on the flex pigtail that goes from the vicinity of the speaker left side (facing back of spkr) down to the mic. element. On the bottom si...

WB6DGN

Scrapped, it pains me to say. Ditto for the COM-120 family.

That tells me all I need to know about ever buying product from that manufacturer.
Tom

WB6DGN

The problem with all this is that if you're making, say, $60,000 per year and don't add at least that much to the gross national product, you're harming your country. Simple as that. That is the one and only reason that this country is in the deep financial mess that it IS in. FAR TOO MANY people in...

WB6DGN

Do you know where the chip cap is located on the flex. Doesn't sound familiar. Maybe I just never noticed it. Think I've still got some used flexes around here. If so, I'll take a look tomorrow and see if I can find it. I think there is a chip cap. across the mic. terminals. Could that be what you'...

WB6DGN

"Any hints on removing the mic/speaker flex cable?" Remove the piece of capton tape over the contacts on the flex where they're soldered to the board. Then carefully use a vacuum desoldering tool to clean as much solder off of the contacts as possible. If necessary, use a soldering iron se...

WB6DGN

That low wage scales make me happy at my job.

If you think THAT'S low, you wouldn't even want to hear what I make at my last job before I retired. WHERE were those jobs fifteen or twenty years ago? I sure never found one!
Tom

WB6DGN

A mini-uhf is a good RF connector at least through 800Mhz. I agree, ELECTRICALLY it is a good connector; I believe its spec'd to about 2 GHz (It really surprised me when I read that). However, MECHANICALLY, well, that's another story. It seems the newer ones are better than the first generation, th...

WB6DGN

Can anyone provide any information on a Motorola Radius SP50 2-way radio battery eliminator? I don't know about aftermarket suppliers but Motorola didn't make one. Even the programming setup is a modified drop-in charger with extra contact(s) for the data line. If you can't find an aftermarket supp...

WB6DGN

Where is primary power connected; directly at the battery? Are contacts clean and is the fuse and its contacts clean and tight? Might also try swapping fuse with a new one and cleaning all contacts even if they look clean and bright. Some radios "Bonk" when pri. voltage drops too low. Just...

WB6DGN

Is it microphonic when receiving a signal or all the time? The Spectra I have uses those little blue Murata IF filters. That is a common problem with those. If yours uses those filters, try tapping gently on the filter case. The tapping sound should get quite loud. The VCO can also cause the problem...

WB6DGN

I've also seen some with a blue insulator. Does that have any significance?
Tom

WB6DGN

There's a vintage Motorola forum on the Yahoo Groups and it gets basically zero traffic month after month. That might be an insight into starting another one elsewhere, but maybe nobody knows about it. I didn't know about it or I would have, at least, checked it out. I thought about that too after ...

WB6DGN

Great idea. Hope there's some interest in this. Have Motran VHF LB and HB radios and would be great to "compare notes" with others interested in similar equipment. Might also look at a "Buy, Sell, Trade" section for only this type equipment as well.
Tom

WB6DGN

There is a member here, Escomm. He has a shop in California, & has been supplying parts & radios to those who need to order them. Jeff is a great guy to deal with, & gets the job done, quickly I might add. Several of my friends [and me too] have been ordering XPR Trbo radios, & even...

WB6DGN

Let's see, here. From the comments above, MDC was enabled and INHIBIT was enabled. The radio was programmed to transmit on a frequency for which it apparently is not authorized. Furthermore, the owner(?) states that he does not want to go to the agency which inhibited it to get it cleared. For me, t...

WB6DGN

What KIND of transmission line; RG-8? RG-58? LMR400? Heliax (what size?)? Didn't see previous comment about coax type. Need to know that; that alone could be the problem. At UHF frequencies, you need good quality, low loss transmission line. In my opinion the absolute minimum for a 100' run would be...

WB6DGN

I won't even comment on the post by fujihi... because my comment wouldn't be very nice; but there are a couple of issues in using a "generic" supply that must (should) be considered. One of those is the radiated and conducted noise generated by the replacement supply which can have a profo...

WB6DGN

Of course pop in fresh batterys and it does not appear to power up. Its been a long time and my mind may be playing tricks on me but, as I recall, the SmartRib doesn't use a battery. If I remember correctly, it uses a 21volt (or thereabouts) wall wart as its only power supply. Maybe, since I retire...

WB6DGN

I like the 2001 series monitor; used one at work until I retired but one caution. Be very sure that the CRT is bright and good focus. Many problems with the display and HV power supplies with the ones my employer had. A replacement CRT, if you can find one, was well over $1000 before I left in 2005....

WB6DGN

I've been retired since 2005 so specifics have somewhat faded from memory but, generally speaking, the UHF Jedis were quite consistent from radio to radio. Interestingly, if there was one that varied from the "norm", it was most often more sensitive than normal as opposed to the other way ...

WB6DGN

I think the first thing I'd do is set the questionable radio and one on your "good" radios up on the bench side by side and, using the same procedure and connections as close as possible to each other, measure the gain through the IF stages. I'm not familiar with the MCS as my last ten yea...

WB6DGN

The RTX4005B (or its newer equivalent, I forgot its part number) provides the interface between the various functions of the service monitor and the radio to easily allow transferring signals and readings between them. As such, while its not exactly "necessary" it sure make life easier bec...

WB6DGN

I take it from your comments that you don't intend to do any field work that requires hauling the monitor around. If that's the case, in my opinion, the best value in a service monitor today is the HP8924C. It is a full capability monitor with even a spectrum analyzer and tracking generator but, due...

WB6DGN

Hi RF, That's the critter. I downloaded the spec. sheet and it gives me everything I needed to know. Think I'm going to pass on it. Just don't have the tools any more to do a decent job modifying the dipoles. If anybody is interested, email me and I'll pass you along to the owner. Not sure what he'd...

WB6DGN

I happened across the above antenna, apparently NOS, still in its factory sealed shipping container. There was no information on the outside of the container except the above part number and, at this point, I do not want to open the container until I determine some basics such as the type of antenna...

WB6DGN

I would think it would be even better to have a remote disable capability for the car. Beside the obvious usefulness in case of theft, one could have a ball with an HT and Valet Parking. The images in my mind have me chuckling right now!
Tom

WB6DGN

I'm looking for a source of wire similar to that used in Motorola power cords. It looks like #12 and is highly flexible. Give these folks a try. I have not bought from them YET, so I have no first hand experience, but I've heard good things about them and they do have the flexible wire in that size...

WB6DGN

A 125w, 900 Mc. VHF Quantar???

WB6DGN

So MP 6.7 IS correct the 35 amp power supply is the one to choose.

Yeah! And so is WB6DGN, thank you very much!

WB6DGN

I used an Astron RS-35 power supply to check out a 110 watt VHF Spectra on my bench with no trouble at all; it wasn't even breathing hard. The duty cycle for the tests was roughly equivalent to a normal conversational exchange and I am NOT claiming that it would handle continuous duty as in repeater...

WB6DGN

Oh, forgot, probably a 2135 key, these are very common and should be easy to find.

WB6DGN

OK, doing this from memory so consider it "ballpark" information. VHF (high band)Motrac base C = consolette (3 to 4 ft.) cabinet 73 = mid power, probably 60 to 100 watts MHB = "M" series receiver, last one made, I think 8 Mc. hi IF, IMO an excellent receiver, even by today's stan...

WB6DGN

"Do you hapen to know if all the parts above are everything I need? " I'm pretty sure your list is complete but its been too long to remember for sure. I've got the manual around here somewhere; give me a little time to find it and confirm that that's all and I'll post here if there's more...

WB6DGN

I think more people would see this and be able to help if you posted it in the General Discussion page. People here mostly have questions about test equipment operation and repair. Sorry, I'm not familiar with the CDM radios so I can't help.
Tom

WB6DGN

MTS2000 antenna switch parts are the same and will work but I hope you have better skills than I did putting that confounded thing together. Don't forget to remove the bypass jumper in the board before you start installing the switch parts. Good Luck, glad its you and not me doing it.
Tom DGN

WB6DGN

I used to have the name of a person near Atlanta, GA, that did re-capping and ham conversion for 900MHz Spectras You're probably thinking of David Rudd, AI4JI. He is in Georgia and recently did the recap on a UHF Spectra for me as I no longer have access to a hot air rework station. He does first c...

WB6DGN

Yup, That's it...Sounds too easy.

As with any new install or repair, it would be prudent to perform F & M checks to insure compliance with the NB specs.
Tom

WB6DGN

We have half a dozen in a scrap container waiting to be scrapped! It breaks my heart but I am not willing to be fired for taking the stuff. Have you asked the appropriate people if you can have them? Many organizations are quite liberal about employee access to no longer needed assets as long as th...

WB6DGN

Do anyone know of a place to do the job that is some what lower on the price... I heartily recommend Rick Bowman at Amtronix in NY. http://www.amtronix.com/. He's very reasonable with his prices and the quality of his work can't get any better. I have no business relationship with Rick other than a...

WB6DGN

"Follow that up with a wash using a tooth brush and TSP (works great for removing surface dirt, as well as the residue left behind by the alcohol)." I assume by TSP you mean tri sodium phosphate. I thought that was no longer available because of environmentalists controlling the amount of ...

WB6DGN

Weelll! I think it was equally fortunate (for the radio) that it was hit almost exactly in the middle of the speaker. There usually aren't any circuit boards in that area. Now, if that nail hit about two inches lower (or more), I think the outcome might have been entirely different. I don't dispute ...

WB6DGN

We replaced the 1st LO and mixer PNP germanium transistors with PNP silicon transistors... Which series receivers did you do that on? I've got VHF Lo and VHF Hi, "L" series receivers. Also, if you don't mind saying, what transistors did you use for replacement. Both of my receivers are pr...

WB6DGN

The HP 8924 is available with either a mechanical attenuator or an electronic attenuator. The units with the mechanical attenuator are accurate from about 200kc (if I remember correctly) to 1000Mc while the units with the electronic attenuator are speced. as accurate from 30Mc to 1000Mc. In this ins...

WB6DGN

Usually that denotes that the unit has the High Stability time base option.

WB6DGN

"SlimBob wrote: "com501 wrote:I use my R8000a to check all that stuff. If I need to do an on-air check, I use one of my XTS's. Yeah? Do you work the 'peater with it? =P As a matter of fact, I can, and do on occasion with my HP8924, even full duplex if I wish. Super sensitive off the air m...

WB6DGN

"WIth my MCS2000, TX pre-emphasis ENABLED..." You are transmitting audio boosted at 6db/octave, ie. highs emphasized. That's what OTHER people are going to hear and their receivers will "readjust that for flat response" by the deemphasis network in THEIR receivers. "...and R...

WB6DGN

If someone with one could measure current during the quick charge portion of the cycle, that would be appreciated. Unfortunately I don't have any 9628 batteries at the moment that will draw enough current to make any meaningful measurements. Need to order some pretty soon but waiting to get an orde...

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