[MRCA] IN-106A antenna base for the SCR-284 - What the heck?

Fri Jun 23 16:27:00 EDT 2017

Steve, Dennis, Mark, Dale, Robert, and anyone else who responded to my plea: 

Thanks for the SCR-284 antenna explanation – It makes sense.  I didn’t realize that the MS-56 was unthreaded, and I guess I don’t have an MS-56, or I would have noticed.  I should have actually got out my pile of MS antenna sections first, apparently.  However, I’m sure I don’t have any that are unthreaded at the bottom.   Strange that the TM doesn’t seem to explain any of this.   

Previously, I’ve only used wire antennas with the BC-654, as I hadn’t found an IN-106A before.   So, looks like another search is in order, or, I just will have to fire up the lathe.  Amazing how one simple radio project breads about 5 other projects…

Reminds me, I probably should show you guys the faux TBX antenna that I made for our WWII Radio event earlier this month. 

Garret

W8BUG

From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On Behalf Of Dennis DuVall
Sent: Friday, June 23, 2017 1:12 PM
To: MKDORNEY at aol.com; mrca <mrca at mailman.qth.net>
Subject: Re: [MRCA] IN-106A antenna base for the SCR-284 - What the heck?

Modified an MS-54 a while back to take the place of an MS-55.  Machinist friend of mine cut a thread on the outside of the fixture at the bottom  end of the -54 that mated with the inner thread at the top end f the  MS-56. Worked FB.

DD, W7QHO

*****************

On Jun 23, 2017, at 7:32 AM, WW2RDO via MRCA <mrca at mailman.qth.net <mailto:mrca at mailman.qth.net> > wrote:

MS 55 and MS 56 can still be had in Europe, but they are getting harder to come by.  I got one of each for my BC-654 last year, one from a seller in Italy, another from France, and I think I paid around $100.00 total.  Vintage vehicle suppliers are also a place to look now, since more and more of those guys are getting radios for their vehicles.  I'm also surprised that nobody has started to reproduce these antenna sections.  The construction looks to be pretty straight forward.

If you're actually going to work your BC-654, and can't find the mast sections you're looking for, get yourself an IN-127 (ground mount) or a AB-65 (vehicle mount) from a BC-1306 and 7 sections of the antenna masts that go with it ( vehicle mount was a 15 ft antenna, ground mount was a 25 foot antenna ).  I have known some who have used the AB-15 antenna base for the 15 ft vehicle antenna, but there is a question about the strength of the spring in this antenna base, so stick with an AB-65.  While they are getting harder to find, the mast sections that go with the IN-127 and AB-65 are a lot easier to get that MS 55 and MS 56 ( that go with mast bases like the MP-48-A).  For most of WW2, the IN-127 was molded in brown plastic, but very late (late 1945) and post war IN-127 were molded in black plastic, and are readily available.  Or go with the long wire AN-130 that came with the BC-1306, or make your own long wire antenna - there are instructions for making this antenna in the manual your BC-654 you can get from Mr Downs.

Mark D.

WW2RDO

In a message dated 6/23/2017 2:02:34 A.M. Eastern Daylight Time,  <mailto:duvallddennis at gmail.com> duvallddennis at gmail.com writes:

OK…  We can always count on Robert to step in set the detail record straight. 

DD, W7QHO

*******************

On Jun 22, 2017, at 9:24 PM, WA5CAB--- via MRCA < <mailto:mrca at mailman.qth.net> mrca at mailman.qth.net> wrote:

MS-55 through MS-49 were originally used with SCR-178, SCR-179 and SCR-203.

MS-55 is as rare as MS-56 (or actually I guess rarer, as I sold out of MS-55 in 2011 but still have two MS-56 available).  Also have IN-106's.

In a message dated 06/22/2017 21:44:53 PM Central Daylight Time,  <mailto:duvallddennis at gmail.com> duvallddennis at gmail.com writes: 

Garret,

The two bottom sectors  of the SCR-284 “rod” antenna, MS-56 and MS-55 are unique to the SCR-284.  The bottom section, MS-56 has a smooth cylindrical bottom end that fits into the 1N-106A.  The top end of MS-56 mates with the bottom end of  MS-55, the top end of which mates with “standard” section MS-54 and so on up through MS-55, MS-54,  MS-53, MS-52………….MS-49 (top section).

MS-56 (bottom) sections are now extremely rare, the last one I saw on eBay went for $500!  Better start thinking about some kind of adapter.  Got a machinist friend?

Dennis DuVall,W7QHO
Glendale, ca

**********************

On Jun 22, 2017, at 5:05 PM, Garret Scott < <mailto:scottgs at bellsouth.net> scottgs at bellsouth.net> wrote:

I acquired a NOS IN-106A base, for the SCR-284 (BC-654). This is the old original style with the large ceramic insulator. 

But…  I don’t understand how the MS-56 antenna section attaches.  There are no threads in the base!!!

I’ve studied TM 11-275, and I just don’t get it. 

Can anyone help me regain sanity? 

Thanks,
Garret
W8BUG

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
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