MIDLAND BANTAM RADIO - PROGRAMMING TIPS colected from Internet Distribution agreement received from Bob Gass N4FV Source: greenecountycommunications.com, Bob Gass N4FV 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). ================== 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. ================== 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). 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.