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#1
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Five Gang Cap
I have a large 5 gang variable cap with anti-backlash gear and worm
drive, does anyone know what radio it comes from? You can see a pic he http://www.radiowymsey.org/IMG_0003.JPG The cap is approx 6 x 3 x 2 inches Thanks, Charlie. -- M0WYM www.radiowymsey.org Sales @ radiowymsey http://shop.ebay.co.uk/gnome7763/m.html? |
#2
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Five Gang Cap
"M0WYM" wrote in message ... I have a large 5 gang variable cap with anti-backlash gear and worm drive, does anyone know what radio it comes from? You can see a pic he http://www.radiowymsey.org/IMG_0003.JPG The cap is approx 6 x 3 x 2 inches Thanks, Charlie. Quick answer, I don't know. However there are clues here that could help someone with a better memory than me. 1. 5 gang variables were common in superhet receivers with two RF stages. Mostly military, and mostly aircraft. 2. Looks like the tuning drive adapter is for a remote control cable. BC-348/224's had 5 gang variables, I believe, as did the BC-312. however those had a direct drive, 1/4" shaft from the worm drive, not a remote cable adapter. Sorry to waste bandwidth here, but I don't know. Old Chief Lynn, W7LTQ |
#3
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Five Gang Cap
On Jul 9, 5:16*pm, M0WYM wrote:
I have a large 5 gang variable cap with anti-backlash gear and worm drive, does anyone know what radio it comes from? You can see a pic hehttp://www.radiowymsey.org/IMG_0003.JPG The cap is approx 6 x 3 x 2 inches Thanks, Charlie. -- M0WYMwww.radiowymsey.org Sales @ radiowymseyhttp://shop.ebay.co.uk/gnome7763/m.html? Probably from a SCR-269 (BC-433) or ARN-7 Radio Compass. Loop, 2 RF, Oscillator and Mixer tuning. John Mackesy VK3XAO |
#4
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Five Gang Cap
On 10/07/10 08:18, VK3XAO wrote:
Probably from a SCR-269 (BC-433) or ARN-7 Radio Compass. Loop, 2 RF, Oscillator and Mixer tuning. John Mackesy VK3XAO John, Thank you very much for that! I will investigate further. Charlie. -- M0WYM www.radiowymsey.org Sales @ radiowymsey http://shop.ebay.co.uk/gnome7763/m.html? |
#5
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Five Gang Cap
On 07/10/2010 03:18 AM, VK3XAO wrote:
On Jul 9, 5:16 pm, wrote: I have a large 5 gang variable cap with anti-backlash gear and worm drive, does anyone know what radio it comes from? You can see a pic hehttp://www.radiowymsey.org/IMG_0003.JPG The cap is approx 6 x 3 x 2 inches Thanks, Charlie. -- M0WYMwww.radiowymsey.org Sales @ radiowymseyhttp://shop.ebay.co.uk/gnome7763/m.html? Probably from a SCR-269 (BC-433) or ARN-7 Radio Compass. Loop, 2 RF, Oscillator and Mixer tuning. John Mackesy VK3XAO The capacitor has a second gear driving a sliding rod, probably used to move a dial pointer (see the two gears below the worm gear?). I suspect the radio was tuned via a motor connected via a spline to the worm drive and the moving rod was somehow connected to the dial pointer. |
#6
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Five Gang Cap
On 10/07/10 08:18, VK3XAO wrote:
Probably from a SCR-269 (BC-433) or ARN-7 Radio Compass. Loop, 2 RF, Oscillator and Mixer tuning. John Mackesy VK3XAO John, I found a picture of a SCR-263 at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg This is the cap but with a forward facing cable connector for the drive cable. Charlie. -- M0WYM www.radiowymsey.org Sales @ radiowymsey http://shop.ebay.co.uk/gnome7763/m.html? |
#7
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Five Gang Cap
On 11/07/10 18:51, Kenneth Scharf wrote:
The capacitor has a second gear driving a sliding rod, probably used to move a dial pointer (see the two gears below the worm gear?). I suspect the radio was tuned via a motor connected via a spline to the worm drive and the moving rod was somehow connected to the dial pointer. See the pic at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg , I think the rod is there to act as a stop, there is a pin on the sliding piece that hits another pin at each end of the lead screw and inhibits rotation. Charlie. -- M0WYM www.radiowymsey.org Sales @ radiowymsey http://shop.ebay.co.uk/gnome7763/m.html? |
#8
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Five Gang Cap
On Jul 13, 6:54*am, M0WYM wrote:
On 10/07/10 08:18, VK3XAO wrote: Probably from a SCR-269 (BC-433) or ARN-7 Radio Compass. Loop, 2 RF, Oscillator and Mixer tuning. John Mackesy VK3XAO John, I found a picture of a SCR-263 atwww.fidnet.com/~seanbart/SCR-263/BC-443-A_Top.jpg*This is the cap but with a forward facing cable connector for the drive cable. Charlie. -- M0WYMwww.radiowymsey.org Sales @ radiowymseyhttp://shop.ebay.co.uk/gnome7763/m.html? Interesting. I restored a SCR-269 system in the early 80's and vaguely remember the cap. SCR-269 Radio Compass/ADF (3 bands) and the very similar AN/ARN-7 (4 bands, same frequency range) run from 28V DC and115V 400 Hz AC and are recognizably from the same stable as the SCR-263 (and the earlier MN-26). B+ is generated by a transformer/ rectifier - 5Z4? - also 48V AC for the indicator system. The SCR-269 was good performer but had endless capacitor failures. Anyplace there was a capacitor with B+ on one side and a ground or a grid on the other was a problem. Current equipment is a '50s AN/ARN-6, still looks similar to the earlier Bendix ADF's. Best of all, the ARN-6 uses +28V on the plates. John VK3XAO |
#9
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Five Gang Cap
On 07/12/2010 04:59 PM, M0WYM wrote:
On 11/07/10 18:51, Kenneth Scharf wrote: The capacitor has a second gear driving a sliding rod, probably used to move a dial pointer (see the two gears below the worm gear?). I suspect the radio was tuned via a motor connected via a spline to the worm drive and the moving rod was somehow connected to the dial pointer. See the pic at http://www.fidnet.com/~seanbart/SCR-...-443-A_Top.jpg , I think the rod is there to act as a stop, there is a pin on the sliding piece that hits another pin at each end of the lead screw and inhibits rotation. Charlie. That would have been my second guess. The 5 tie plates holding the rotor plates together binding against the stator plates would have worked as a stop (that's how MOST caps work), but might not be a good idea in a motor driven tuner. |
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