[ARC5] ARC5 Digest, Vol 171, Issue 12

Thu Apr 12 17:27:47 EDT 2018

There was an article in a late 1958 QST ( I think ) on converting a BC-454 and a BC-455 to a 455kc output which would feed a BC-453 resulting in a double conversation receiver with (so claimed) vastly improved performance with low cost surplus gear.
I built the BC-455 into BC-453 and it worked very well for the $10 I’d invested in it.
I never finished it because college and grad school got in the way.

I am now retired and intend to finish it. 
Does anyone have a 3 receiver rack they can part with?

73
Rcik

> On Apr 12, 2018, at 16:36, arc5-request at mailman.qth.net wrote:
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> Today's Topics:
> 
>   1. Re: ARC-5 Double Conversion (Kenneth G. Gordon)
>   2. Re: [BoatAnchors] FW: AVT-15 Tuning Charts (w8au at sssnet.com)
>   3. Re: ARC-5 Double Conversion (Glen Zook)
>   4. Re: [Milsurplus] [BoatAnchors] FW: AVT-15 Tuning Charts
>      (Mike Morrow)
>   5. Re: ARC-5 Double Conversion (J Mcvey)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 12 Apr 2018 10:07:21 -0700
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: J Mcvey <ac2eu at yahoo.com>
> Cc: Arc5 at mailman.qth.net
> Subject: Re: [ARC5] ARC-5 Double Conversion
> Message-ID: <5ACF9249.28449.5991439 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
> 
>> On 12 Apr 2018 at 16:53, J Mcvey wrote:
>> 
>> Can I just heat up the wax and slide the coil on the form?
> 
> No. The work required is more difficult than that.
> 
> FYI, Aircraft Radio Corp experimented with doing something very similar to Jeep's method 
> after WWII. There is an article in ER Mag about this.
> 
>> An old-timer gave me a BC-459 in rough shape. it was heavily modified. One of 
>> the mods was that all of the IF's were changed to the 85 KHZ cans and I suppose 
>> the LO was modified to accommodate them.
>> I'm thinking pulling the cans and coils and swap them into a working BC-459 to 
>> see what happens...
> 
> Good idea.
> 
> Selectivity will be vastly improved, but image response may suffer a bit. The image will be 
> only 170 kHz away, so if it is strong, it will bleed into the main signal.
> 
> Ken W7EKB
> 
> ---
> This email has been checked for viruses by Avast antivirus software.
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> 
> 
> ------------------------------
> 
> Message: 2
> Date: Thu, 12 Apr 2018 14:49:29 -0400
> From: w8au at sssnet.com
> To: boatanchors at lists.theporch.com,"ARC-5" <arc5 at mailman.qth.net>,
>    <mrca at mailman.qth.net>,<milsurplus at mailman.qth.net>
> Subject: Re: [ARC5] [BoatAnchors] FW: AVT-15 Tuning Charts
> Message-ID: <mailman.1551.1523565374.9989.arc5 at mailman.qth.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
> 
> Question for AVT/AVR folks....
> 
> Was the BC-474, an amalgamation of these two pieces of aircraft 
> gear  (my assumption)
> ever used in the L-4 and L-5 spotter birds?
> 
> USS LST325 was outfitted as a L-bird carrier for the Pacific after 
> returning from the Normandy campaign.
> We have a big model L-4 hanging in the tank deck display area and 
> would like to add any information
> about any other type of radios used.
> 
> Perry  w8au
> 
> 
> At 08:43 AM 4/11/2018, David Stinson via BoatAnchors wrote:
>> Can anyone help with this request, please?  An L-5
>> aircraft restoration project is asking.
>> 
>> 
>> 
>> From: 42sentinel at comcast.net
>> [mailto:42sentinel at comcast.net]
>> Subject: AVT-15 Tuning Charts
>> 
>> . I saw an old post of yours concerning the RCA
>> AVT-15 Transmitter. I'm presently restoring an old
>> Stinson L-5 which used those radios. I have almost
>> every item needed except for the Tuning chart
>> K-29457-1 and tuning chart instructions K-29456-1.
>> 
>> 
>> 
>> 
>> Any help you could provide in locating the charts
>> would be much appreciated.
>> 
>> 
>> 
>> Best Regards,
>> 
>> Don Ayres
>> 
>> _______________________________________________
>> BoatAnchors mailing list
>> BoatAnchors at lists.theporch.com
>> https://lists.theporch.com/mailman/listinfo/boatanchors
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Thu, 12 Apr 2018 19:23:20 +0000 (UTC)
> From: Glen Zook <gzook at yahoo.com>
> To: J Mcvey <ac2eu at yahoo.com>, DSP3 <jeepp at comcast.net>,    "Kenneth G.
>    Gordon" <kgordon2006 at frontier.com>
> Cc: "Arc5 at mailman.qth.net" <Arc5 at mailman.qth.net>
> Subject: Re: [ARC5] ARC-5 Double Conversion
> Message-ID: <620440367.2333293.1523561000316 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Methinks you have your model numbers confused!? The BC-459 is a transmitter that covers 7.0 MHz to 9.1 MHz.?Glen, K9STH?
> Website: http://k9sth.net
> 
>      From: J Mcvey via ARC5 <arc5 at mailman.qth.net>
> To: DSP3 <jeepp at comcast.net>; Kenneth G. Gordon <kgordon2006 at frontier.com> 
> Cc: Arc5 at mailman.qth.net
> Sent: Thursday, April 12, 2018 12:03 PM
> Subject: Re: [ARC5] ARC-5 Double Conversion
> 
> "Do you have a copy or link to the article?Can I just heat up the wax and slide the coil on the form?
> An old-timer gave me a BC-459 in rough shape. it was heavily modified. One of the mods was that all of the IF's were changed to the 85 KHZ cans and I suppose the LO was modified to accommodate them.I'm thinking pulling the cans and coils and swap them into a working BC-459 to see what happens...
> 
> 
> 
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> 
> ------------------------------
> 
> Message: 4
> Date: Thu, 12 Apr 2018 15:54:26 -0400 (EDT)
> From: Mike Morrow <kk5f at earthlink.net>
> To: w8au at sssnet.com, boatanchors at lists.theporch.com,    ARC-5
>    <arc5 at mailman.qth.net>, mrca at mailman.qth.net,
>    milsurplus at mailman.qth.net
> Subject: Re: [ARC5] [Milsurplus] [BoatAnchors] FW: AVT-15 Tuning
>    Charts
> Message-ID:
>    <860520738.8979.1523562866521 at wamui-gaston.atl.sa.earthlink.net>
> Content-Type: text/plain; charset=UTF-8
> 
> The SCR-288 would be an extraordinarily poor choice for such service.
> 
> The pilot in a light observation aircraft of that era definitely did not need a indirect-frequency-calibrated VFO-only transmitter and three PA tuning controls, a receiver that had no crystal-control option that was often battery-powered, a transmitter powered from a hand-crank generator, no PTT capability...just a panel switch, all in an awkward heavy cabinet impossible to open in flight, etc. etc.
> 
> Beyond all that, there would be no reason to put the BC-474 in any sort of aviation service.
> 
> Major components of a very typical Stinson light aircraft radio set would consist of:
> 
> AVR-20-A1   HF receiver, VFO or two Crystal-Controlled channels
> AVT-112     HF transmitter, Crystal-Controlled
> R-76/ARR-13 Beacon band receiver (Setchell-Carlson 512)
> AVA-126     HV vibrator supply (12vdc) for the above
> 
> Yet another set combo used the older AVT-15 in place of the AVT-112 and AVA-126.
> 
> These seem to be an accurate representation of the radio gear in Stinson aircraft.  And all of it is more commonly available to a restorer, compared to the SCR-288.
> 
> Mike / KK5F
> 
> -----Original Message-----
>> From: w8au at sssnet.com
>> Sent: Apr 12, 2018 1:49 PM
>> To: boatanchors at lists.theporch.com, ARC-5 <arc5 at mailman.qth.net>, mrca at mailman.qth.net, milsurplus at mailman.qth.net
>> Subject: Re: [Milsurplus] [BoatAnchors] FW: AVT-15 Tuning Charts
>> 
>> Question for AVT/AVR folks....
>> 
>> Was the BC-474, an amalgamation of these two pieces of aircraft 
>> gear  (my assumption)
>> ever used in the L-4 and L-5 spotter birds?
>> 
>> USS LST325 was outfitted as a L-bird carrier for the Pacific after 
>> returning from the Normandy campaign.
>> We have a big model L-4 hanging in the tank deck display area and 
>> would like to add any information
>> about any other type of radios used.
>> 
>> Perry  w8au
>> 
>> At 08:43 AM 4/11/2018, David Stinson via BoatAnchors wrote:
>>> Can anyone help with this request, please?  An L-5
>>> aircraft restoration project is asking.
>>> 
>>> From: 42sentinel at comcast.net
>>> [mailto:42sentinel at comcast.net]
>>> Subject: AVT-15 Tuning Charts
>>> 
>>> . I saw an old post of yours concerning the RCA
>>> AVT-15 Transmitter. I'm presently restoring an old
>>> Stinson L-5 which used those radios. I have almost
>>> every item needed except for the Tuning chart
>>> K-29457-1 and tuning chart instructions K-29456-1.
> 
> 
> ------------------------------
> 
> Message: 5
> Date: Thu, 12 Apr 2018 20:36:04 +0000 (UTC)
> From: J Mcvey <ac2eu at yahoo.com>
> To: DSP3 <jeepp at comcast.net>, "Kenneth G. Gordon"
>    <kgordon2006 at frontier.com>,    Glen Zook <gzook at yahoo.com>
> Cc: "Arc5 at mailman.qth.net" <Arc5 at mailman.qth.net>
> Subject: Re: [ARC5] ARC-5 Double Conversion
> Message-ID: <796810803.2471939.1523565364020 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
> 
> "The BC-459 is a transmitter that covers 7.0 MHz to 9.1 MHz."yup the radio is a BC-455
> 
> 
>    On Thursday, April 12, 2018, 3:23:24 PM EDT, Glen Zook <gzook at yahoo.com> wrote:  
> 
> Methinks you have your model numbers confused!? The BC-459 is a transmitter that covers 7.0 MHz to 9.1 MHz.?Glen, K9STH?
> Website: http://k9sth.net
> 
>      From: J Mcvey via ARC5 <arc5 at mailman.qth.net>
> To: DSP3 <jeepp at comcast.net>; Kenneth G. Gordon <kgordon2006 at frontier.com> 
> Cc: Arc5 at mailman.qth.net
> Sent: Thursday, April 12, 2018 12:03 PM
> Subject: Re: [ARC5] ARC-5 Double Conversion
> 
> "Do you have a copy or link to the article?Can I just heat up the wax and slide the coil on the form?
> An old-timer gave me a BC-459 in rough shape. it was heavily modified. One of the mods was that all of the IF's were changed to the 85 KHZ cans and I suppose the LO was modified to accommodate them.I'm thinking pulling the cans and coils and swap them into a working BC-459 to see what happens...
> 
> 
> 
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> End of ARC5 Digest, Vol 171, Issue 12
> *************************************