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help Montgomery Ward Gen 702A
- Thread starter ziggy703
- Start date
I do not think you are going to fine a VR inside the radio that will just "turn up " the RX on the radio, about the best thing to do is do an alignment on the radio receiver.
It is hard to find info on the Montgomery Ward radios because there where just not that many made, the 702 is nice looking and the built in clock is cool.
I do not know if there is a Sam Photo fax that cover`s that model, that should have the alignment in it, or if you get the number off the PLL chip in the radio, and find another radio that uses the same chassis that would work as well.
My little Bro had one of those radio....I do remember it worked well, but i think it had a "non modifiable" PLL in it, he just used it as is for a while and finally sold it.
If it receives decent already, I would not worry about it.
I would Adjust VR6 for best modulation, and NOT cut D209, be careful playing with L208 L209 L210 L211, the slugs in them are fragile and crack easily, then they get stuck and are useless.
If it is working OK as is, I would just not worry about it and enjoy talking on it.
73
Jeff
It is hard to find info on the Montgomery Ward radios because there where just not that many made, the 702 is nice looking and the built in clock is cool.
I do not know if there is a Sam Photo fax that cover`s that model, that should have the alignment in it, or if you get the number off the PLL chip in the radio, and find another radio that uses the same chassis that would work as well.
My little Bro had one of those radio....I do remember it worked well, but i think it had a "non modifiable" PLL in it, he just used it as is for a while and finally sold it.
If it receives decent already, I would not worry about it.
I would Adjust VR6 for best modulation, and NOT cut D209, be careful playing with L208 L209 L210 L211, the slugs in them are fragile and crack easily, then they get stuck and are useless.
If it is working OK as is, I would just not worry about it and enjoy talking on it.
73
Jeff
It's amazing that none of the 200 people who looked could tell you that everything you need to know about the Gen 702A is in Sam's # 233. If you don't have access to the sam's, adjust L203, 204, 205, 206, 207, 208, 209, 210, and 211 for maximum rf output while modulating the unit with a 1000 cycle tone. Use a PLASTIC tuning tool. Replace C1 (2200uf/35V) on the power supply board with a 4700uf/35V electrolytic. Connect a voltmeter to the red lead on the power supply board and ground, and adjust VR1 until you get a reading of 14.8vdc (it won't do much more than that). Modulation adjust is VR206 or cut D209. A decent power mike would really help this radio. If you want the receive aligned, I suggest you take it to a good tech who has the proper equipment. For extra freqs, connect pin 14 on the pll chip to ground thru a switch. 73s.
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The Sams CB233 for the 702A model shows pin 14 not connected. It is internally "pulled up" to a logic 1 when it's not connected.
Grounding it makes that input a logic "0". The Lou Franklin PLL Data Book says the channel coverage will bump up 56 channels doing this. That would make channel 1 27.525, and channel 40 28.165.
Doesn't do anything for channels 40 to 51, if I'm reading it right.
Don't have any experience with that PLL. It's an oddball chip used only in some American Motors (!) radios, four other Monkey Wards radios, one Kraco and one Sears radio.
None of those were common to see around here when they were new.
It appears that if you cut the foil trace to pin 3 on the PLL and wire a switch across it, you'll get channels 28-59 on channels 1-27 with the switch open.
Maybe.
73
Grounding it makes that input a logic "0". The Lou Franklin PLL Data Book says the channel coverage will bump up 56 channels doing this. That would make channel 1 27.525, and channel 40 28.165.
Doesn't do anything for channels 40 to 51, if I'm reading it right.
Don't have any experience with that PLL. It's an oddball chip used only in some American Motors (!) radios, four other Monkey Wards radios, one Kraco and one Sears radio.
None of those were common to see around here when they were new.
It appears that if you cut the foil trace to pin 3 on the PLL and wire a switch across it, you'll get channels 28-59 on channels 1-27 with the switch open.
Maybe.
73
Hi Nomad, Yeah I have had mine for some time now, just debated on what I was gonna do. Wished I could get matching channel LED's too but that is another story I'm sure! I may bring this in to you sooner than you think, and find out if the 28-59 is duable or not, as that is a bit more appealing.
Appriciate your input, Retro