Bantam Mobile Information

Bantams are small, black radios with a 2 digit red LED display and have a RJ45 jack on the front.  They can be programmed for up to 22 channels and program through the RJ45 MIC connector on the front using later versions of XTR software or with the Windows XTR/ST2 software. The 70-1309A  programming cable was used for the Bantam/Titan series.  

GCC offers the MP-1 programmer that programs the Bantam, as well as other radios.  You can order it from our product page.

  Bantams come in VHF and UHF.  70-1337X is the VHF version and 70-1527X is the UHF version.  These radios are narrow band compliant as well as wideband. The letter on the end of the model number designates the frequency sub-band range.  A 450-470 mhz B range radio can be programmed on 440 mhz ham frequencies but will more than likely power up with a flashing 3 error code and require the VCO to be aligned. The VHF version can have the bandsplit changed from "B" to "A" and then will accept 2 meter frequencies but may need the VCO aligned.   Power cables may be purchased from Bridgeman Communications and they have wiring diagrams available. 

For specifications, click here.  (offsite link)

Programming Tips:  If the SCAN LED is lit, the radio will error when trying to read or program.  Make sure scan is turned off.   

If using the Windows Version Software, do not check the 70-1337 box if programming a 70-1527 radio. 

To program a wideband (5 khz deviation) frequency, uncheck the 3rd auxiliary data box in the Windows software or change the 3rd auxiliary bit from 1 to 0 in the DOS software. Leaving the box checked or a 1 will result in narrow band mode (2.5 khz deviation). 

The following information is presented to help touch up the alignment for Amateur Radio use.

It is recommended a service monitor or calibrated signal generator, deviation meter, and frequency counter be used for any frequency and modulation adjustments.  The following table is a general guide to getting a functioning radio converted for Amateur use.  VCO alignment only requires the use of a suitable DC voltmeter and most radios will provide acceptable service with just this adjustment.  

To open, remove volume control, insert a flat screwdriver into the slots on either side and gently pry up and pull forward. Squelch, power output, CTCSS. DCS. and deviation are all located on the top board and do not require any boards to be removed to adjust.

Squelch - RV901 Adjust with .2 uv unmodulated signal for squelch to just open. 
Power Output RV902 Adjust for a maximum of 25 watts output.   For amateur service lower the output to 10-15 watts to reduce heating (and increase the life of your PA).    Courtesy of  http://greenecountycommunications.com
VCO Steering Line  Remove the upper PC board. (3 screws). Carefully fold over the circuit boards to access the RF board underneath.  Look for the small solder pad labeled "VC" beside the flat silver shield with 2 holes in it.  L713 is in the hole closest to the front and is the RX VCO.  L703 TX VCO is the other hole.  On the lowest frequency adjust the steering voltage on "VC" for 1.5 volts on RX at L713 and then key TX and tune L703 for 1.5 volts.  When VCO is locked, the flashing 3 will go away.
Modulation Adjust RV401 DO NOT ADJUST WITHOUT PROPER TEST EQUIPMENT
RV402  DCS Level DO NOT ADJUST WITHOUT PROPER TEST EQUIPMENT
RV403 CTCSS Level DO NOT ADJUST WITHOUT PROPER TEST EQUIPMENT
Frequency Netting The preliminary VHF manual I have states the TCXO is not adjustable and carrier should be plus or minus 300 hz of programmed frequency.  I've seen one UHF radio that the TCXO was adjustable where Midland used a different TCXO than what the manual lists.  The TCXO is mounted on the component side of the RF board so you have to remove the board to see if yours is adjustable.  Remove all the screws (including the PA and driver transistor mounting screws) and remove the board. Pay attention to the spacers that heat sink some of the  transistors as you remove the board. The 12.8 mhz TCXO is a flat, aluminum shielded square device with 4 legs on one side and 2 on the other.  If your device has a hole and a small slotted shaft sticks up, you can adjust it.  If there is no slotted shaft sticking out of it, you are out of luck.  The non-adjustable TCXO is labeled as  FCTX 02  and the adjustable TCXO is TCO 987A.  If you have the non-adjustable TCXO and the radio is off frequency too much, there is no way to adjust it other than to replace the TCXO.
Front end and injection Not adjustable according to manual, only accessible with RF board removed from heat sink. 

Instructions When Using the 70-1310 PC Programming Software

When programming a
70-1337 mobile radio use one of the following methods:

Method 1: Upload From Radio (Recommended)
1. Upload the contents of the radio's EPROM into the PC.
2. Select "Manual" from the Edit menu.
3. Change the EPROM Address "D" from "8A" to "94".
4. Edit any other parameters as required. Do not enter any channel
information greater than channel 22.
5. Download the new settings into the radio's EPROM.

Method 2: Complete Reprogramming
1. Select the Model VHF(H) B-Band.
2. Complete entering all programming parameters as needed. Do not program any channel greater than 22.
3. Select "Manual" from the Edit menu.
4. Change Address "D" from "8A" to "94".
5. Download the new settings into the radio's EPROM.

NOTE: If the radio wil not accept the download, make sure:
1. The EPROM Hex Value at address "D" is "94".
2. That no more than 22 channels have been programmed.
 

Hacked Power Connector For Bantam, XTR 8 channel,  and Titan

WARNING!!! I assume no responsibility if you decide to make your own power cable and damage your radio by wiring or connecting it wrong. Please refer to the www.bridgemancommunications.com  for proper connections to the radio. 

You can make a connector by robbing the main connector off a bad ATX computer power supply and cutting down the molex connector so it will plug into the radio .  Using a very small jewelers screw driver, you can press the tabs on the pins and remove the wires.  Rearrange them so you don't get the power leads mixed up with the other wires.  The tab on the computer connector won't match up when you cut the plug down but the connector seats well and won't come out that easily. 

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