[Boatanchors] Unknown PI Coils

[Michael Bittner]

Brian,
I finally got sorted out the total pile of swap meet plug-in coils that 
included the unknown coils we have been discussing.  It turns out that some 
in the pile are Signal Shifter coils.  In order to get my money back out of 
these, I put some of them, including all the Signal Shifter type coils, on 
eBay last night.  If you are interested in these, here is the eBay URL for 
them:

https://www.ebay.com/itm/302716261364

Of course, I'm still looking for information on the unknown coils and hoping 
to find the two missing RF coils from the set.  Incidentally, the forms for 
the highest frequency coils are grooved to accept the heavy gauge wire, and 
this must have been done on a lathe.

73, Mike W6MAB


----- Original Message ----- 
From: "Brian Harris" <cosmophone at yahoo.com>
To: "Michael Bittner" <mmab at cox.net>
Sent: Wednesday, April 25, 2018 06:11
Subject: Re: [Boatanchors] Unknown PI Coils


Upon closer review, you are right. They aren't Meissner coils.  Whoever made 
them did a great job though.  They are nice enough to warrant building a 
receiver that can use them as-is.

73, Brian

>> On Apr 23, 2018, at 7:27 PM, Michael Bittner <mmab at cox.net> wrote:
>>
>> Does anyone recogize these plug-in coils that I just got at a swap meet?
>>
>> https://photos.app.goo.gl/9PCo6kyq6EPGGeBu2
>>
>> https://photos.app.goo.gl/wp6PiLeswX4ri1Pq1
>>
>> They are wound on 1.5-inch diameter phenolic coils forms that are mounted 
>> on standard 5-pin tube bases.
>> There is a set of 4 coils marked Det for 160, 80, 40 & 20 meters, and 2 
>> coils marked RF for 80 & 40 meters.
>> The detector coils are tapped for a Hartley circuit.  Too bad the 160 and 
>> 20 meter RF coils are missing, although
>> I also got some matching blank forms that I could wind myself for the 
>> missing coils.
>> The markings on them are hand written, but they appear to be factory 
>> wound.  Look like the start of a
>> nice regen receiver project and I'd sure like to find out more about 
>> them.
>>
>> Are they really factory wound, or the work of an excellent craftsman?
>>
>> Mike, W6MAB


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