Philco 76-1134 Antenna Coupler (three prong)
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I just bought a Philco 76-1134 antenna coupler for my Philco 41-250, and have the schematic which someone else drew.
This was first discussed (at least with me involved) in this thread where there are photos of the unit which Ron posted:
http://philcoradio.com/phorum/showthread.php?tid=1472
[Image: http://i269.photobucket.com/albums/jj77/...0001-3.jpg]
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Stephen
Thanks very much for sharing this! This should be very helpful to everyone.
Now we know how Philco intended for a longwire to be connected to those 1941 and 1942 sets which have this jack.
With this information, a person could make his or her own coupler.
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Ron Ramirez
Ferdinand IN
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I just looked at the one I bought, which had been carefully cut throught the solder which joins the bottom to the can. The Mica capacitors color dots are black-blue-black, with an orange dot below those three, indicating a value of 6pF +/- 3%
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City: Yorkville IL
I know I'm late coming in on this but, are there any markings on the "coil" listed in the schematic?
Thanks Glenn
Happily back in Illinois..not.
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I can't see any marks, but was able to emasure it - 0.292 mH
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I don't know if I am missing something, but the schematic does not make sense to me. In the distance position the antenna is connected to the receiver through the resistor, cap, and inductor network. In the local position the antenna is not connected to anything, and only the network is connected to the receiver. I would think the antenna should be connected in some way in either switch position.
Harv
Harv
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Harv
In the "local" position, the radio would be operating only on its loop antenna, so there would be no need for a connection to an external antenna when the switch is in the "local" position.
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Ron Ramirez
Ferdinand IN
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That makes sense Ron. Now I'm trying to figure out why Philco used that network when the external antenna was connected. I'm a curious person.
Harv
Harv
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Using the information in these messages, I built an external antenna unit for my 41-250. It improves the S/W reception considerably, as would be expected, and also helps a little on the BC band. Since my external antenna is only 40 feet long, it may be too short to provide a significant improvement on the BC band.
Harv
Harv
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City: Bristol, RI
Hi all,
I would like to build one of these couplers. But a few questions:
First, what is that coil on the schematic? An inductor? If so would anybody tell me exactly what I would need to buy? Not sure what it is, values etc.
Also, what's the value of the mica?
I am very interested in building one of these, and any help I receive would be much appreciated. Thank you,
Ted
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See posts #3 and #5 above, where Stephen Masek found the mica cap to be 6 pF and measured the coil at 0.292 mH.
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Ron Ramirez
Ferdinand IN
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Thanks Ron. My apologies for overlooking the mica value. But I did see the .29 mh coil reference; my problem is of more of a practical nature. Where would I find something like this? Googling .3 coil offers no help, so I've no idea where to go from here and was hoping you all could point me in the right direction. Thank you!
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Posts: 79
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Joined: Feb 2014
City: Bristol, RI
Thank you!
Mouser is almost like an inside joke to me. I have gone on that site a handful of times looking for a particular value resistor, cap, etc., but usually leave frustrated. Their search system is labyrinthine!
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That isn't the right inductor, is it? This calls for .3uH, the linked one is 300uH.
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