[TenTec] Bird Termaline 50 Ohm load - 82A - Need adapter

[Don Jones]

http://www.mwjournal.com/BGDownload/RF%20Connector%20Guide.pdf
This link gives a little history and might be helpful too.

Don Jones KO7i
Arlington, WA 



-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Dr. Gerald N. Johnson
Sent: Wednesday, November 17, 2010 8:57 AM
To: tentec at contesting.com
Subject: Re: [TenTec] Bird Termaline 50 Ohm load - 82A - Need adapter

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-98240
a9ff67c.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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