[MRCA] IN-106A antenna base for the SCR-284 - What the heck?
MKDORNEY at aol.com
MKDORNEY at aol.com
Sat Jun 24 00:53:43 EDT 2017
If you are making mast sections like the MS-55 or MS-56, don't forget to
paint the connectors the correct colors so as to aid in the assembly and
disassembly of the antenna mast.
Mark
WW2RDO
In a message dated 6/23/2017 4:27:19 P.M. Eastern Daylight Time,
scottgs at bellsouth.net writes:
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,
_duvallddennis at gmail.com_ (mailto: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 <_mrca at mailman.qth.net_
(mailto: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,
_duvallddennis at gmail.com_ (mailto: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 <_scottgs at bellsouth.net_
(mailto: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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