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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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18th Aug 2022, 1:41 am | #1 |
Triode
Join Date: Apr 2021
Location: Lansdale, Pennslyvania, USA
Posts: 46
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Tank Radio BC-603 receiver
ALL, need to know how to remove the Push button assembly.
Thanks, Skip. |
18th Aug 2022, 10:18 am | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Tank Radio BC-603 receiver
Just had a look at one and for starters the front panel has to come off and I would say some serious dismantling.
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18th Aug 2022, 2:03 pm | #3 |
Triode
Join Date: Apr 2021
Location: Lansdale, Pennslyvania, USA
Posts: 46
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Re: Tank Radio BC-603 receiver
Yup I agree. I was able to get front panel off
Decided to not take take assembly out.. My issue is the tuning control is frozen cannot turn it at all so i thought it would be easier to work on it with assy out Skip |
19th Aug 2022, 2:28 am | #4 |
Triode
Join Date: Apr 2021
Location: Lansdale, Pennslyvania, USA
Posts: 46
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Re: Tank Radio BC-603 receiver
Need a power supply for this .. I do not have the Dynamotor.. Any have a schematic of one??
Skip |
19th Aug 2022, 5:53 am | #5 |
Heptode
Join Date: Jun 2012
Location: Southeast Norfolk, UK.
Posts: 773
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Re: Tank Radio BC-603 receiver
The original manual is here:-
http://jptronics.org/Military/bc603/bc603.pdf There is a section on mods for the BC-603 in the Surplus Radio Conversion Manual Vol 3 which I have digital copies of and which I can e-mail to you. It's 12Mb so probably won't go via this group. Send me a private message if you want it. 73 Roger |
22nd Aug 2022, 7:36 pm | #6 |
Triode
Join Date: Apr 2021
Location: Lansdale, Pennslyvania, USA
Posts: 46
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Re: Tank Radio BC-603 receiver
Anyone know how to change the presets for frequencies>
Skip |
22nd Aug 2022, 9:29 pm | #7 |
Hexode
Join Date: Jul 2006
Location: Sheffield, South Yorkshire, UK.
Posts: 312
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Re: Tank Radio BC-603 receiver
I've never seen one of these radios and this is pure guesswork but having studied the images in the manual that Roger kindly linked above...
Each button actuates a toothed rack which engages with a gear wheel on the tuning shaft and rotates it to a particular position when pressed. Fig 14 shows that for each button, there is a friction washer between the gear wheel and what looks like a disk. I am guessing that the gear wheel is free to rotate on the shaft, but is coupled to it by the friction washer and the disk, which latter is firmly attached to the shaft. I'm guessing, and it is only a guess, that you can somehow release the friction allowing you to tune to a frequency by turning the tuning thumbwheel, then pressing the desired button, then tightening it again. I note that there is a hole in the panel above the buttons, which I suspect has to do with this. Looking at fig. 12 on page 11, it looks like behind that hole there is a tube through which you can pass a screwdriver to engage maybe with a clamp screw (?) on the end of the tuning shaft, when the latter is aligned with the hole. Let me know what you find! Alan G0NFY |
23rd Aug 2022, 12:22 am | #8 |
Triode
Join Date: Apr 2021
Location: Lansdale, Pennslyvania, USA
Posts: 46
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Re: Tank Radio BC-603 receiver
ok will do thanks that gets me started in right direction
Skip |
24th Aug 2022, 5:40 pm | #9 |
Tetrode
Join Date: Aug 2013
Location: Monterey, California USA
Posts: 51
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Re: Tank Radio BC-603 receiver
I last fooled with one of these in my youth but as I recall, there was a hole you put a screwdriver down, loosened a set screw, and then set the push-buttons after manual tuning.
I hate to rain on the parade here but this has to be one of the most useless pieces of surplus communications gear to put any time into. It was intended to receive wide band FM transmissions between 20-28 MHz, of which there are none today. By wide band I mean 50-60 kHz deviation. The IF is extremely broad, so even if converted to AM it will only be usable on a signal far removed from any others. The best use for these today is to talk to other BC-603/604 sets in military vehicles, which is not legal in most countries. Decades ago we converted these to monitor highway patrol and police above 30 MHz, but that was a lot of butchery and only worked if there were no adjacent channel stations. |
24th Aug 2022, 8:20 pm | #10 |
Triode
Join Date: Apr 2021
Location: Lansdale, Pennslyvania, USA
Posts: 46
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Re: Tank Radio BC-603 receiver
I agree with you.. This will be going into a Sherman tank.. I would like to get it working however.. probably will be used as you say maybe tank to tank for demo purpose ..
Thanks Skip |