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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