The thread is probably 1-1/8"-18 and there probably is a ring from a
multi pin military connector that will fit. Look at Amphenol series 97
shell size 18 (MIL-C-5015 style). You could start with a 97-60-20(621)
(Mouser catalog number 654-976018621). Blow a 5/8"-27 threaded hole in
the middle, then turn from brass rod or assemble from bits of hobby shop
tubing a center pin adapter for a UHF or type N barrel. It might be
handier to use the ring from a straight plug. That's what I did adapting
an LC connector on another dummy load to N.
But you will need to measure the thread pitch carefully to be sure.
I dug out a 1971 Bird catalog, and under adapters it shows a part number
8110-186 described as "CA-8B Male Coplanar to Femals N Connector (used
on certain obsolete models)" It also shows a number 4240-180 described
as a "Male Coplanar to QC Receptacle, to be used with any QC connector."
Prices in 1971, 8110-186 was $10 and 4240-180 was $35.
I probably have MIL-C-5105 parts, but I'm sure I don't have those Bird
connectors to check the threads or to have either of those adapters.
Rooting further on line, I found a Bird manual for a similar load where
they state the thread is 1-1/8-18 which matches the MIL-C-5105 thread.
There they called the adapter a CA-8B part number 811186.
http://www.bird-technologies.com/resources/discontinued/bec_manuals/884-463.pdf
http://www.bird-technologies.com/resource/item-754c25b1-8309-4e3b-be2f-98240a9ff67c.aspx
has a list of obsolete manuals, but doesn't include the 82A in that list.
Bird may have been the only source for that adapter and I have no idea
today. They still show the coplaner to QC adapter at:
http://birdtechnologies.thomasnet.com/item/accessories-adapters/qc-adapters/4240-180?&bc=100|1019|1032|3001115|3001080
73, Jerry, K0CQ
On 11/17/2010 9:44 AM, Bill Mellema wrote:
> I have a friend who just bought a used Bird 500 watt Termaline 50 ohm load,
> model 82A. It has a coaxial connector as shown in the photo linked below.
> He needs an adapter to adapt this connector to type N (or UHF) like the one
> sitting on the table in the photo. (The photo is not of the 82A that I have
> but it illustrates the connector and the adapter I need.) The connector on
> the load measures 1.125 in. diameter across the threads. The QC type
> connectors now used on Bird products is not what is used on the model 82A.
>
> Does anyone know where he can purchase an adapter?
>
> Thanks In Advance,
>
> Bill N3WM
>
>
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