[ARC5] ARC5 Digest, Vol 193, Issue 67
Peter Bertini
radioconnection at gmail.com
Thu Feb 27 09:48:25 EST 2020
Yes, obviously it will no longer work in an AN/ARC-5 configuration--if I
ever find a connector I may change it.
But, the radio has too many to issues to ever really qualify for a true
restoration. I'd have to fill the extra holes
and then have the cabinet and chassis painted. I do have a much nicer T-18
that is also going to be
cleaned up--fortunately it was never hacked over. At least electrically
this one is closer to what it should be.
The filament dropping resistor was from a donor transmitter that was
loaded with mud daubers. The resistance wire
on the resistor had several breaks. I removed the windings and paralleled
a 120 ohm metal oxide across the
terminals. At first I was clever and hid it inside of the ceramic body.
That idea fell apart after I figured out
it would no fit onto the bracket. The donor was trashed and missing
relays, covers, roller inductor, etc.
The reason the resistor is mounted incorrectly is due to the added mounting
bracket I needed to adapt
a ARN-274N power connector to the enlarged rear opening (which was off
center) on the back apron.
Those are Allen head flat screws, not rivets. The bracket lips interfere
with the resistor holder if
mounted horizontally. That bracket came from a coil from an ARC-5
recever at one time. I swapped
out the connector--the hole size was perfect.
The inside chassis was washed with CRC Electrical Parts cleaner to remove
excess rosin, etc. Soap
and hot water on the outside painted surfaces, followed by a polish to
bring back some luster... but
there are areas with a lot of chips and missing paint.
The bypass caps are common 630V Panasonic radial lead parts. I would have
installed a rebuilt flower
pot, except the original holes were enlarged by the previous owner.
When I find a suitable antenna relay I will call it done for now... I may
sub a more common modern
24VDC relay in the interim.
On Thu, Feb 27, 2020 at 9:13 AM <arc5-request at mailman.qth.net> wrote:
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> Today's Topics:
>
> 1. Re: BFO Color Code (tbs50a at aol.com)
> 2. Re: T-18 Restoration by Pete Bertini (Mike Morrow)
> 3. Re: T-18 Restoration by Pete Bertini (Michael Hanz)
> 4. Re: BC-453 in operation. (AN/ARC5 Yellow-Circle-S) (Mike Morrow)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 27 Feb 2020 04:32:04 +0000 (UTC)
> From: tbs50a at aol.com
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] BFO Color Code
> Message-ID: <1949981663.847190.1582777924860 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> I've got a brown set from a Q5er.
> Terry N3GTE
>
>
> -----Original Message-----
> From: J Mcvey via ARC5 <arc5 at mailman.qth.net>
> To: arc5 <arc5 at mailman.qth.net>; Robert Eleazer <releazer at earthlink.net>
> Sent: Wed, Feb 26, 2020 10:11 pm
> Subject: Re: [ARC5] BFO Color Code
>
> If you have a signal generator put a series 10k resistor between the hot
> and top end of the BFO coil and ground to the ground side. Put a scope
> across the coil and seep the frequency to find the max level which will be
> the resonant frequency.The scope may de-tune it slightly , but it will be
> close enough for ID purposes.
>
> On Wednesday, February 26, 2020, 4:25:14 PM EST, Robert Eleazer <
> releazer at earthlink.net> wrote:
>
> I was sure that somewhere I had a file provided by someone in this gorup
> that not only gave the frequencies of the various coils but the color codes
> for each - but I can't find it.?I have three command set BFO coils.? One is
> color coded Red and is marked 239 KC.? One is color coded Yellow and is
> marked 1415 KC. And one is color coded Black - maybe Dark Brown - and has
> no?other markings.? Anyone know what the?Black one might be??By the way,
> the Transmitter oscillator coils are color coded as well.? Which one is
> Yellow??Thanks!?WayneWB5WSV?______________________________________________________________
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> ------------------------------
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> Message: 2
> Date: Thu, 27 Feb 2020 07:02:05 -0600 (GMT-06:00)
> From: Mike Morrow <kk5f at earthlink.net>
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] T-18 Restoration by Pete Bertini
> Message-ID:
> <834689231.1042.1582808525891 at wamui-charming.atl.sa.earthlink.net>
> Content-Type: text/plain; charset=UTF-8
>
> > ...because the replacement power connector has to be positioned
> > almost perfectly so the FT-226A rack's power plug pins align
> > correctly...
>
> And...to emphasize common knowledge, an AN/ARC-5 transmitter does not fit
> into an SCR-274-N (or ATA) rack for many reasons both electrical and
> mechanical. There are only two AN/ARC-5 transmitter components that are
> electrically and mechanically interchangeable with equivalent transmitter
> components of the ATA or SCR-274-N systems...the dynamotor and the antenna
> relay and absolutely nothing else.
>
> Mike / KK5F
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 27 Feb 2020 08:27:09 -0500
> From: Michael Hanz <aaf-radio-1 at aafradio.org>
> To: Tom Bridgers <tarheel6 at msn.com>, "arc5 at mailman.qth.net"
> <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] T-18 Restoration by Pete Bertini
> Message-ID: <770688e0-f392-5f31-91f5-9ebd9105ff8c at aafradio.org>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
>
> On 2/26/2020 9:48 PM, Tom Bridgers wrote:
> >
> > 1. I was surprised to see that you attached the new rear power connector
> > using rivets.? Why the surprise?? Well because the replacement
> > power connector has to be positioned almost perfectly so the FT-226A
> > rack's power plug pins align correctly when they mate with the
> > power connector. Excellent craftsmanship, and I sure would like to
> > know your
> > secret to making that happen?
> >
>
> You're right, Tom.? I too was concerned about that issue in restoring a
> T-17/ARC-5.? I show one way to do it at
> https://aafradio.org/garajmahal/T-17-ARC-5_restoration.html - there are
> probably other methods.
>
> > 1.
> > And finally it looks like you replaced R-71, the 126 ohm, 7 W,
> > heater equalizing resistor with a hand wound resistor.? Was
> > wondering what wire you used, and why you mounted it vertically,
> > instead of horizontally as it was originally. It's an interesting
> > decision, and was curious.
> >
>
> Looks like a wirewound resistor was paralleled by a 1 watt 270 ohm
> carbon resistor in the photograph.? I guess Pete will let us know shortly.
>
> ????????? 73,
> ?- Mike KC4TOS
>
> > Date: Wed, 26 Feb 2020 15:29:10 -0500
> > From: Peter Bertini <radioconnection at gmail.com>
> > To: arc5 at mailman.qth.net
> >
> > I picked this one up from a local ham... it was modified and pretty much
> > ruined
> > as a collector grade radio.
> >
> > Photos are shown in this forum link..
> >
> >
> https://antiqueradios.com/forums/viewtopic.php?f=5&t=372562&p=3158610#p3158610
> >
>
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> Message: 4
> Date: Thu, 27 Feb 2020 09:13:16 -0500 (EST)
> From: Mike Morrow <kk5f at earthlink.net>
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] BC-453 in operation. (AN/ARC5 Yellow-Circle-S)
> Message-ID:
> <2081790030.1836.1582812796894 at wamui-charming.atl.sa.earthlink.net
> >
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> End of ARC5 Digest, Vol 193, Issue 67
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