Modifications for the Albrecht 485/Magnum 257/Roadmaster Titan II/Blackhawk


These Mods are for Export Applications Only!

Improper use may be in violation of Radio Regulations in your country.


Enabling Full Band Mode, Version 1


 

* Hook up radio to power and turn on for a minimum of 10 seconds.
* Turn off radio and disconnect from all power sources.
* Remove Bottom cabinet cover.
* Locate Diode D2 on the vertical Front Panel PCB (see image below), this is the only Non-Surface Mount component found in this area.
*Clip or remove (unsolder) Diode D2.
* Reset the radio CPU by temporarily shorting the two front panel circuit board pads (see below) located near & just right of Black Potentiometer.  
* Hook the radio back up to power and turn on the radio.
* Press the FUNC button, then press and hold the CALL button for approx. 3 seconds. The frequency and band indicator ( A-J) will appear on LCD.
* Tap the CALL button to select bands A through J.  FCC CB frequencies are on band E.
* To switch between channel and frequency display, press the FUNC button and then press the CALL button.
* When turned off and on again, the radio will always default to original 10 meter settings. 
* To automatically return to last used frequency and mode, simply tap #4 button or press the FUNC button and then press and hold the CALL button for approx. 3 seconds.

 


Enabling Full Band Mode, Version 2


This version of the mod was sent to me by Bookworm, thank you.

I have an addition to your magnum 257, Roadmaster Titan II, etc. mods page.

I recently aquired a Titan II and all I had to do was find the four pins at the (conv1) location on the board and jump them (1&2,3&4).

thanks..bookworm

 


A quick way to change bands, sent to me by Cris

For the Titan II, Black Hawk, AE845, Magnum 257 & 357

Instead of using the func switch and the holding the call button for 3 seconds, program into memory a channel in 11 meters or use LCR. quick and easy.


Enabling Full Band Mode, Version 3


This version of the mod was sent to me by Andy, thank you.

In reference to the Magnum 257 mod, I just got a new one and there's been a slight change. There is now a "reset board" inside the radio that contains a reset button so you don't have to short out the board to reset. Also, the diode that you clip to get extra frequencies is no longer there. There is now a jumper on the reset board. You move it from CN1 to CN3 and it opens the frequencies, no cutting/soldering required!

The reset button and jumper are the only differences in the mod, everything else remains the same.


Possible conversion info, not sure it is for this radio, but it looks like it may be !



A quick way to change bands, sent to me by Cris

For the Titan II, Black Hawk, AE845, Magnum 257 & 357

Instead of using the func switch and the holding the call button for 3 seconds, program into memory a channel in 11 meters or use LCR. quick and easy.


Microphone configuration Pin Descriptions



       1 - Audio
       2 - Receive
       3 - Transmit
       4 - Ground = Channel Down, 22K Ohm to Pin 3 = Channel UP (was originally listed as 2.2K, a visitor told me it was wrong)
       5 - Ground and Switch common
       6 - 13.8 Volts.  SEE CAUTION BELOW


CAUTION: Shorting-out Pin #6 can cause damage to radio!  If you decide to install a new mic,  we strongly suggest you remove pin #6 from the mic plug to avoid any possibility of a short!


Variable Adjustments



       RV-1 - S-Meter Signal Strength
       RV-4 - AMC, AM Modulation
       RV-8 - RF Output Meter
       RV-9 - ALC, SSB Modulation and Peak Power.
       RV-14 - FM Carrier Power
       RV-16 - AM Carrier

 


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