Batboard

techie

Talk to Greg Carttar.
He built a bunch of 4 channel units, using modified comparator chassis, with CDM's for receivers.

techie

Just add a capacitor to block the DC on the mic input, if you can get one..

techie

The easy way to tell is to pull out your multimeter, and check continuity between the connector and the shell of the RF connector to locate the ground pin.

techie

If you have line of sight, rather than converting to ROIP over wifi, I would look at using some of the Adtran Tracer microwave bridges. These are license free 2.4 or 5.8Ghz radios, with advertised ranges out to about 20-30 miles. Current products have capacities ranging from mixed 8xT1/16Mbs, up to ...

techie

Or a small relay..

techie

With the right parts, you could use two of the pairs to create a third "phantom circuit". You would need 2 pairs of center tapped repeat coils (transformers to the rest of us). Tellabs 4421/4422 or 4424/4425, Wescom 730, or Western Electric types. I know WE 111C's will work, but they are p...

techie

+1 for keeping PM's.

techie

Yeah.. the color code is standard.. you're just not used to seeing it in that context..
Black/Brown/Red/Orange/Yellow/Green/Blue/Violet/Grey/White

techie

An easy way to confirm would be to terminate the input/output of the amp, and hook the rf output of the cradle to a wattmeter+dummy load or service monitor, and see what the output level is from the cradle. I would bet that the mode select options may vary depending on the control unit used.. With t...

techie

From looking at the Daniels site, it appears that the following pieces are available that would cover the amateur bands: Transmitters 136-174, 380-470 Receivers 136-174, 430-450 Amplifiers: 132-174 (20-30w), 144-152 (60-110w). There appears to be a hole in the UHF amplifiers from 430-450, but it may...

techie

There is also a lot of T-band in the SF bay area, mostly on the west side of the bay. Marin county has a P-25 trunking system on T-band for the entire county, including local agencies. San Mateo county has a P-25 trunking system for the county, plus several conventional mutual-aid channels, and all ...

techie

I've never used this stuff, but these folks dropped their url in my inbox a week or two back..

http://www.controlbyweb.com/products.html

techie

You pull up the record on the ULS page, and in the frequency tab, go to the upper right corner, and define view "emission".

techie

Your license shows 25 MO @4w on 451.9, and 456.9, and a single FB2 @45w on 451.9.
A pretty standard setup.

Your repeater is going to be listening on 456.9, and transmitting on 451.9, and the portables will be reversed, 451rx/456tx.

techie

I just checked the license, and your system is narrowband (11K2F3E). Even if it wasn't, you would have until 2013 to change to narrowband. The MX's are wideband, so you would first need to convert the MX to narrowband operation, which is non-trivial. The mods will also void the type acceptance, mean...

techie

Sounds like marine duplex cable. Ancor is one manufacturer, Berkshire is another. http://www.marinco.com/product/standard-duplex-cable http://www.marinco.com/product/safety-duplex-cable http://www.berkshireelectriccableco.com/boat/boat_pages/duplex.html Check with your local marine supplier, or goog...

techie

The connector on the back of the Astro Spectra is a DB15 female. Nope.. It's a DA15. (the second character indicates the connector shell size). With the standard contact arrangements, there are DA15, DB25, DC37, DD50, and DE9. Other configurations are available (double density, coax, hi voltage, hi...

techie

All sorts of options here: (from a quick google search for "cabinet locks") everything from replacement keyed type locks, combination, electronic combination, key with padlockable cover, etc.. http://www.thehardwarehut.com/cabinet_locks.php http://www.eastloc.com/ http://www.rockler.com/Ca...

techie

IIRC, The memory chips in the R-1801 were standard 2114 1kx4 SRAM. 6 are needed for the 1k->4k upgrade. They are still available for ~$1.50-2.00 each, if you don't have any lying around.. they were used in a bunch of things including Commie-64's, arcade games, etc.. I scored a 1801 off of ebay about...

techie

IIRC, you program one of the function buttons as "phone", which will then allow you to step through several presets, to a scratchpad, and finally a live dtmf pad. you can either enter a string of digits to the scratchpad, and send them all at once, or use the live pad interactively.

techie

Those red ht220's look like the prison alarm units.. no speaker, no ptt button, just a alarm button and a red led on top (shielded to be visible only from above)

techie

The cradle and control unit are separate units, and both are required. The amp, if so equipped, is included in the control unit. IIRC, the amp has a separate power connection. I don't remember if the integration with the control unit that would cause any problems if you simply left the amp powered d...

techie

You can buy desk mic's pre-wired for spectra on ebay..

or:
http://www.batlabs.com/deskmic.html (not the exact same model, but I think they are all very similar)
http://www.batlabs.com/spectra.html (mic pinout is at the top.)

techie

FYI: the 37 pin D-sub connector is a DC-37.. Second letter is shell size.. with standard pin configuration, the sizes are DA-15, DB-25, DC-37, DD-50, and DE-9, but there are lots of variations in pin configurations. Just like RJ-45 (which isn't a connector type, but rather a wiring spec for a specif...

techie

Ignition - switched +12.

techie

We have an OO here in the SF bay area who has made accusations that the users of our repeater system, and one user in particular, have been jamming on the system that he lives on. The basis of this accusation? the jammer was kerchunking with MDC, and we have some users who use MDC on our system. He ...

techie

The key is the same cuts as a 2135, on a different blank, with the center groove on the other side.
My first 2135 was cut from a MOT1 ..

techie

2580600E01
It's listed on the bottom of the cradle.
/\/\ wants $38.59 for it..
13.8vdc @ 0.9A standard 2.5mm coax type plug. center positive.

techie

The San Francisco area also has a lot of T-band.. mostly conventional, with a pair of P-25 smartzone systems, as well as some 800 type-II, a couple of EDACS, VHF, and even a bit of lowband. Most of the peninsula from SF -> south is T band, as well as some of the east bay.

techie

You could also try looking for a Motrac or Motran.. I actually have a working loband Motrac sitting here, with a Mocom-70 head on it.

If you use a Maxtrac, you could probably wire a small relay to take the PTT from the mic, and use it to key the radio, and the transmit light.

techie

On a similar note (I guess), what is the difference between switched and unswitched B+? I am planning to put a A4 spectra in my car and would like to just use the power cable (red+black) to power up. Thanks unswitched B+ is always hot, direct to the battery. It serves to keep memories, user scanlis...

techie

Looking at the schematic again, it looks like if JU1 and JU2 are both installed, then IGN and B+ are tied together, which would probably accomplish what you are looking for. I would make sure to isolate the IGN lead. If you're using a remote mount, then you already have a power lead to the control h...

techie

Why not just wire ignition to B+? The manual lists JU1 and JU2. The radio is shipped with JU1 out, and JU2 in. for ignition control, wire ignition to switched B+. for front panel control, wire ignition to unswitched B+ for ignition control of TX-inhibit, remove JU2, install JU1, wire ignition to swi...

techie

ZMN-6022A was for the HT-220 Converta-com. It is a dynamic mic with transistor pre-amp.

My 1980 vintage /\/\ accessories catalog also indicates that the Mocom10 used spade lugs, and the Mocom35 was a 5 pin connector.

techie

http://www.batlabs.com and batboard.batlabs.com are under different ownership/management. The guy who runs http://www.batlabs.com seems to have dropped off the face of the earth, but as long as the domain is still functional, and the dns zone continues to be served, we're happy.. Hopefully the domai...

techie

I would avoid using the radio, and if you can, take it apart, and give the contaminated boards a vinegar bath, followed by a distilled water or isopropyl alcohol bath.

techie

http://www.jameco.com

no minimum order ($5 added for processing on non-web orders)

They are 15 minutes up the road from me, depending on traffic.

techie

Regarding Q1 - Microphones: You can use most Maxtrac microphones such as HMN1035C, or HMN1056D. Manual DTMF mics such as HMN3013 and HMN1037, and some early miniature mics such as the HMN1056A are not compatible. For standard microphones both of the DIP switches on the bottom of the cradle should be...

techie

I still have my old bag-phone that I got back in 1995. Still have several bills in the pocket of the "bag". Too funny to see how much it cost back then. They charged for airtime, roaming and long distance... I got 30 minutes of airtime per month and it cost me $39.95 plus taxes and fees.....

techie

see http://www.open.org/~blenderm/spectra for comprehensive spectra info.

the only known rear control head is the HCN1071C (A9)

techie

Ditto.. I could use a few dedicated monitor radios for fire season.

techie

Nope.

And the rear head is different than the front head. I managed to kill a regular head by connecting it as a second head.
The keyboard matrix is messed up..

techie

Not without a lot of work.. The NTN1340C is just the holder, there is very little in the way of electronics in there (essentially just a audio volume control circuit to supply the amplified speaker.) The rest of the electronics, including the microprocessor controlled charging circuitry are all loca...

techie

Here's a posting from yahoo if anyone is interested.. Message 4886/4942 Mik... <wa6ilq@arrl.net> Sep 17, 2007 06:39:36 pm -0700 X-Sender: wa6ilq@arrl.net To: Motorola-Micor@yahoogroups.com, Repeater-Builder@yahoogroups.com, Repeater@yahoogroups.com, Repeaters@yahoogroups.com, Motorola-Metrum-Motrac-...

techie

Hmm..
HHCH similar to A3 spectra? I saw a /\/\ CB like that on ebay a while back..

You can try checking continuity from RF ground to DC ground..

techie

I am fond of using Birch plywood with a couple coats of varathane for the cabinet, and aluminum for the switch panels. You could also use MDF for the cabinet. If you want to think modular, look at building something like a chest of drawers, with each radio mounted thru the front of the drawer. Think...

techie

The HLN1196 wildcard DEK box uses a DB-25. The pinout is here http://www.batlabs.com/x9000.html

techie

Take a 2135 key, and a Cole CG6 blank. orient the keys so the center grooves are opposite each other. (when the key is cut, the cuts will align if the center grooves are facing each other) The result should be a MOT1 key.

When I bought my first X9000, i didn't have a 2135 yet, but I did have a MOT1.

techie

Lets see.. Subpart A is GMRS, I don't remember what Subpart B used to be, (It's now FRS), Subpart C is R/C (boats/planes/etc), Subpart D is 27mhz CB, Subpart E is technical standards, Subpart F is 219Mhz , Subpart G is LPRS. Subpart H is WMTS (medical telemetry), Subpart I is MICS (medical implants)...

techie

It looks like it might work with the amp powered down, although there are a couple of sense leads that simply don't exist in the non-amplified version that would remain connected. not sure if they would present any problems.

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