[Milsurplus] Was speaking of GP-7 - now RU/GF style j-box
Jim Horn
zippypik at aol.com
Wed Dec 22 03:38:24 EST 2010
Another possibility may be the SCR-AR-283. The manual shows an RU/GF style j-box as "part of airplane, not furnished by Signal Corps". Maybe an aircraft manufacturer had A.R.C. make up some for a particular aircraft??
Features which differ from the "average" RU/GF j-box: Only one 5 pin plug (as used on the LM) instead of two. A 2 pin plug (PL-76) for a switch which I believe to be a throttle switch. A toggle switch for transmit & receive OR receive only. Uses an 8 pin PL-64 for Tx & 8 pin PL-61 for Rx. Has 2 fuses. Has a sidetone relay inside.
Robert is probably right, as usual. The 133 connectors seem to define it as RU-18 or RU-19.
-----Original Message-----
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To: milsurplus <milsurplus at mailman.qth.net>
Sent: Tue, Dec 21, 2010 3:57 pm
Subject: Milsurplus Digest, Vol 80, Issue 30
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Today's Topics:
1. Soviet-service P-39 Recovery/Restoration (Mike Morrow)
2. Re: Soviet-service P-39 Recovery/Restoration (Mike Morrow)
3. Re: [ARC5] Navy GP-7 Transmitter Connectors Available
(John J Mccarty)
4. Re: [ARC5] Navy GP-7 Transmitter Connectors Available
(Joseph Pinner)
5. Re: [ARC5] Navy GP-7 Transmitter Connectors Available
(WA5CAB at cs.com)
6. Re: [ARC5] Navy GP-7 Transmitter Connectors Available (Mike Hanz)
7. Speaking of the GP-7... (David Stinson)
8. Navy Key (J ALLEN CALL)
9. Re: Speaking of the GP-7... (WA5CAB at cs.com)
10. F.S.TA-43/PT Field Phone (Ronnie)
----------------------------------------------------------------------
Message: 1
Date: Tue, 21 Dec 2010 11:07:56 -0600 (GMT-06:00)
From: Mike Morrow <kk5f at earthlink.net>
Subject: [Milsurplus] Soviet-service P-39 Recovery/Restoration
To: milsurplus at mailman.qth.net, arc5 at mailman.qth.net
Message-ID:
<12927954.1292951276794.JavaMail.root at elwamui-karabash.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
Here's an interesting story of a P-39 that was discovered in summer 2004 that
crashed
in Lake Mart-Yavr, Russia, in 1944. Last October it came back to the New York
factory
in which it was made for restoration.
-Local News Video:
http://bcove.me/kda9aph8
-History, description, more photos:
http://www.eaa.org/news/2010/2010-10-21_p-39.asp
In the cockpit photo at the bottom of the next web page there's an obvious MN-28
control box for the Bendix MN-26 RDF. It's hard to tell much else about the
radio installation from this small photo.
http://untoldvalor.blogspot.com/2008/01/p-39-airacobra-discovered-in-russian.html
The remains of the 22-year-old pilot was still in the aircraft. In the video
you'll see
one of the pilot's medals, "The Order of Glory", found with the remains.
Mike / KK5F
------------------------------
Message: 2
Date: Tue, 21 Dec 2010 11:31:26 -0600 (GMT-06:00)
From: Mike Morrow <kk5f at earthlink.net>
Subject: Re: [Milsurplus] Soviet-service P-39 Recovery/Restoration
To: milsurplus at mailman.qth.net, arc5 at mailman.qth.net
Message-ID:
<29538926.1292952686640.JavaMail.root at elwamui-karabash.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
I wrote:
>In the cockpit photo at the bottom of the next web page there's an obvious
MN-28
>control box for the Bendix MN-26 RDF. It's hard to tell much else about the
>radio installation from this small photo.
> http://untoldvalor.blogspot.com/2008/01/p-39-airacobra-discovered-in-russian.html
On further look at a blow-up of the cockpit photo, there is:
-MN-52 manual RDF loop antenna control to the lower right of the MN-28,
-BC-451-A transmitter control box (dangling upside down near starboard side),
-(Possible, but un-clear) BC-450-A three-receiver control box below MN-28.
The SCR-274-N installation isn't too surprising, but the MN-26 RDF is.
Mike / KK5F
------------------------------
Message: 3
Date: Tue, 21 Dec 2010 11:33:20 -0600
From: John J Mccarty <jmccarty at alcatel-lucent.com>
Subject: Re: [Milsurplus] [ARC5] Navy GP-7 Transmitter Connectors
Available
To: milsurplus at mailman.qth.net, ARC-5 <arc5 at mailman.qth.net>
Message-ID: <4D10E4E0.2020408 at lucent.com>
Content-Type: text/plain; charset=us-ascii
I also have had my GP-7 on the air via the generator from a TBW. The generator
has sprung a pretty good oil leak and is on my winter "to-do" list. Used the rig
paired with an ARB to check into some of the AM nets here in the Midwest. One of
the AMer's did tell me he checked my signal on his scope and it appeared to have
"asymmetrical" modulation, which I took to mean that one side band was stronger
than the other. I put it down to poor tuning a grid modulated transmitter on my
part.
73 and Merry Christmas
John n9hrt
On 12/21/2010 9:19 AM, Jack Antonio wrote:
> I have had a GP-7 on the air as well. RIght now the set as awaiting
> re-assembly, but it is working its way up the project list. It will be
> paired with an RU-19 set.
>
> I run mine off a PE-206 inverter, which I obtained from Robert Downs,
> and a 400 cycle variac from Fair Radio. The PE-206 is only an 80V
> unit. The combination is a little light in the power department to run
> full power CW, but works OK on AM.
>
> I've always been a dollar short or a day late in finding an 800-1
> Inverter, or newer solid state 800 cycle power supply.
>
> In my case, the GP-7 is not quite as stable as the BC-375, but
> certainly plenty good enough for 75 meter AM. It may be due to
> my power setup, I need to experiment with including the variac
> in the regulator circuit of the inverter.
>
> Jack Antonio WA7DIA/4
>
>
> On 12/20/2010 10:25 PM, mac wrote:
>
>>All,
>>
>>How many operating GP-7s or GP-* are out there? I run one off an 800
>>cps MG set originally paired with the TBW but have never heard (or
>>heard of) another one.
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
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------------------------------
Message: 4
Date: Tue, 21 Dec 2010 14:34:52 -0500
From: Joseph Pinner <kc5ijd at bellsouth.net>
Subject: Re: [Milsurplus] [ARC5] Navy GP-7 Transmitter Connectors
Available
To: Jack Antonio <scr287 at att.net>
Cc: "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net>
Message-ID: <865F1C22-A266-485C-BEF0-8E562C543C55 at bellsouth.net>
Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes
Jack, et al,
Can you run a GP-7 or TBW on 400 cycle power?
I have a TBW I want to get on the air and I do not want to butcher it
to do so.
I cannot find a 800-1 to date.
Sent from my iPhone
On Dec 21, 2010, at 10:19 AM, Jack Antonio <scr287 at att.net> wrote:
> I have had a GP-7 on the air as well. RIght now the set as awaiting
> re-assembly, but it is working its way up the project list. It will be
> paired with an RU-19 set.
>
> I run mine off a PE-206 inverter, which I obtained from Robert Downs,
> and a 400 cycle variac from Fair Radio. The PE-206 is only an 80V
> unit. The combination is a little light in the power department to run
> full power CW, but works OK on AM.
>
> I've always been a dollar short or a day late in finding an 800-1
> Inverter, or newer solid state 800 cycle power supply.
>
> In my case, the GP-7 is not quite as stable as the BC-375, but
> certainly plenty good enough for 75 meter AM. It may be due to
> my power setup, I need to experiment with including the variac
> in the regulator circuit of the inverter.
>
> Jack Antonio WA7DIA/4
>
>
> On 12/20/2010 10:25 PM, mac wrote:
>> All,
>>
>> How many operating GP-7s or GP-* are out there? I run one off an 800
>> cps MG set originally paired with the TBW but have never heard (or
>> heard of) another one.
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
------------------------------
Message: 5
Date: Tue, 21 Dec 2010 14:47:27 EST
From: WA5CAB at cs.com
Subject: Re: [Milsurplus] [ARC5] Navy GP-7 Transmitter Connectors
Available
To: kc5ijd at bellsouth.net, scr287 at att.net
Cc: milsurplus at mailman.qth.net
Message-ID: <46bd.22d7729.3a425e4f at cs.com>
Content-Type: text/plain; charset="US-ASCII"
Joe,
The short answer is no. The results of doing it wouldn't be quite as bad
(or wouldn't be bad as soon) as running 400 cps stuff off of 60. But in the
end, the results would be the same. You'd fry the transformer(s) and might
do likewise to the inverter.
I still have a few of the PE-106-A's left if you want to go that route.
But as Jack said earlier, they're actually a little shy of the KVA rating for
full power out and as they were made to supply 80 VAC for Brit equipment you
need a step up transformer. Another possibility I've often thought about
is the brute force method of full wave rectifying and then filtering the
output of a 400 cps inverter. Efficiency would be awful of course.
In a message dated 12/21/2010 1:35:08 PM Central Standard Time,
kc5ijd at bellsouth.net writes:
> Jack, et al,
>
> Can you run a GP-7 or TBW on 400 cycle power?
>
> I have a TBW I want to get on the air and I do not want to butcher it
> to do so.
>
> I cannot find a 800-1 to date.
>
> Sent from my iPhone
>
> On Dec 21, 2010, at 10:19 AM, Jack Antonio <scr287 at att.net> wrote:
>
> >I have had a GP-7 on the air as well. RIght now the set as awaiting
> >re-assembly, but it is working its way up the project list. It will be
> >paired with an RU-19 set.
> >
> >I run mine off a PE-206 inverter, which I obtained from Robert Downs,
> >and a 400 cycle variac from Fair Radio. The PE-206 is only an 80V
> >unit. The combination is a little light in the power department to run
> >full power CW, but works OK on AM.
> >
> >I've always been a dollar short or a day late in finding an 800-1
> >Inverter, or newer solid state 800 cycle power supply.
> >
> >In my case, the GP-7 is not quite as stable as the BC-375, but
> >certainly plenty good enough for 75 meter AM. It may be due to
> >my power setup, I need to experiment with including the variac
> >in the regulator circuit of the inverter.
> >
> >Jack Antonio WA7DIA/4
> >
Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
------------------------------
Message: 6
Date: Tue, 21 Dec 2010 14:56:03 -0500
From: Mike Hanz <aaf-radio-1 at aafradio.org>
Subject: Re: [Milsurplus] [ARC5] Navy GP-7 Transmitter Connectors
Available
To: "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net>
Cc: Joseph Pinner <kc5ijd at bellsouth.net>
Message-ID: <4D110653.8010003 at aafradio.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 12/21/2010 2:34 PM, Joseph Pinner wrote:
> Can you run a GP-7 or TBW on 400 cycle power?
Sadly, no. There simply isn't enough iron in the power transformers to
support the lower frequency at the power level required of the
transformers. You also have the problem of keying the set in CW mode
with a lower line frequency, which in theory would require larger
filtering capacitors to maintain the same ripple specification.
However, there are a variety of lab inverters that can be tuned upward
to 800Hz. My favorite is the older Behlman series like the 100-C and
100-AS, though you could probably squeak by with a 75-C or 75-AS at
750VA. They don't usually bring as high a price as the later ones with
a digital meter, but still provide a kilowatt with less than 1/2%
distortion. You have to have patience and keep looking - the ones on
ebay at the moment all suffer from the overpriced buy-it-now problem,
but occasionally you will see one appear for a lot less. Repair is
fairly easy - the older ones are all discrete component designs and only
uses any chips in the small oscillator drawer, IIRC.
Vy 73,
Mike KC4TOS
------------------------------
Message: 7
Date: Tue, 21 Dec 2010 15:09:43 -0600
From: "David Stinson" <arc5 at ix.netcom.com>
Subject: [Milsurplus] Speaking of the GP-7...
To: <milsurplus at mailman.qth.net>
Message-ID: <8E71E40F143845449C9AD8A30EEB05B7 at DaddyPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Speaking of the GP-7...
I have a junction box which looks physically like the one
used for 24 volt GF/RU, but has a different set of connectors,
including a couple of 133s which are used by the GP and not,
according to any of my manuals, for the GF/RU.
The box was built by Aircraft Radio Corp on a special contract
and is not marked for any specific set. I have not traced the circuit,
but it looks very much like it was used to interface the GP transmitter
with the RU receiver. Anyone have any docs on this?
Thanks. 73 Dave S.
P.S.
Here's a new one for Christmas 2010:
Fa La La My....
(copyright 2010 D. Stinson)
Tis the season to spend money.
Fa la la la la, and all that cr*p...
I'm going broke and it ain't funny.
Fa la la la la, and all that cr*p...
The registers are steady beeping.
Fa la la la, la la la and all that cr*p...
My bank account is steady leaking.
Fa la la la la, and all that cr*p...
For toys and junk, the kids are screaming.
Fa la la la la, and all that cr*p...
My checks are all so hot they're steaming.
Fa la la la la, and all that cr*p...
They say that Christmas comes from Heaven.
Fa la la la, la la la and all that cr*p...
At least 'till we file Chapter Seven.
Fa la la la la, and all.... that.... crap...!
------------------------------
Message: 8
Date: Tue, 21 Dec 2010 21:44:37 +0000
From: J ALLEN CALL <w7ksg at q.com>
Subject: [Milsurplus] Navy Key
To: <milsurplus at mailman.qth.net>
Message-ID: <SNT127-W2CC5A604C0CA25A5B291DFB1A0 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
The U.S. Navy CW key and oscillator has been SOLD. Thanks to all.
J
W7KSG
------------------------------
Message: 9
Date: Tue, 21 Dec 2010 17:27:38 EST
From: WA5CAB at cs.com
Subject: Re: [Milsurplus] Speaking of the GP-7...
To: arc5 at ix.netcom.com, milsurplus at mailman.qth.net
Message-ID: <f805.74a12c66.3a4283da at cs.com>
Content-Type: text/plain; charset="US-ASCII"
Dave,
As it was built by A.R.C. (and it's 24 volt), if it had a nameplate, it
would probably say CBY-62017. The RU-11/12 and 18/19 receivers and junction
box use 133's. It might have been for RU-12. The equivalent connector (same
insert) for the GP is marked P-2.
In a message dated 12/21/2010 3:09:48 PM Central Standard Time,
arc5 at ix.netcom.com writes:
> Speaking of the GP-7...
> I have a junction box which looks physically like the one
> used for 24 volt GF/RU, but has a different set of connectors,
> including a couple of 133s which are used by the GP and not,
> according to any of my manuals, for the GF/RU.
> The box was built by Aircraft Radio Corp on a special contract
> and is not marked for any specific set. I have not traced the circuit,
> but it looks very much like it was used to interface the GP transmitter
> with the RU receiver. Anyone have any docs on this?
> Thanks. 73 Dave S.
>
Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
------------------------------
Message: 10
Date: Tue, 21 Dec 2010 23:57:10 -0500
From: "Ronnie" <n1udi at att.net>
Subject: [Milsurplus] F.S.TA-43/PT Field Phone
To: <Milsurplus at mailman.qth.net>
Message-ID: <608305BF0B0046D0B7B3C0B7E77A1123 at military68207d>
Content-Type: text/plain; charset="iso-8859-1"
I have a very nice TA-43/PT field phone. The item's condition is immaculate. The
drab green canvas bag is not worn out. The phone it self is in like
condition.The manufacturer, Western Electric Company. No batteries were stored
the battery compartment, so there is no sign of corrosion. I can shot a few jpgs
if needed. Asking $50 plus shipping. 73's Rock
------------------------------
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