[R-1051] Six pack attack

Fri Dec 13 16:46:53 EST 2019

Ross
Sorry to hear of the issues.
Boy the 5 MHz ref would have to be way off to make it stop transmitting.
But if you have some other radio say a R1051 as I recall its reference came
out the back.
Feed that into the external ref in on the urc35. Or any other good 5 MHZ
sine wave ref even a sig gen would work for a quick check as long as its
set to 5 MHz. Don't forget to switch the internal module to external input.
The 5 MHz do fail and are fixable just have to dive in.
Various modules in the 6 pac do depend on reasonably accurate references.
The crystals phase lock to the references and in my experience the xtals
are about the weakest link and fail or can be re-adjusted back in by adding
small caps on a given bad xtal. (I have been lucky so far)
I highly suspect its something more.
How do you know the exciter isn't working. It could be the amp.
Easily checked feed a 100 mw signal in and see.
Regards
Paul
WB8TSL
But as mentioned I somewhat doubt thats the issue

On Fri, Dec 13, 2019 at 8:30 AM ROSS HOCHSTRASSER <bavarianradio at comcast.net>
wrote:

> Hello and season's greetings, I have a URC-35(A) that was working
> perfectly until it stopped transmitting. I have the  large fold out manual
> which is full of schematics (beautifully done!!)  but I'm having some
> trouble understanding the signal flow.  Are there any gurus here that may
> have a block diagram showing signal flow or even possibly a set of
> extenders?? I'm not sure why I think this is a 35A, but the transceiver is
> a RT-618A/URC. I am using it with an AM 3007/URT. One anomaly I noticed was
> the 5 mhz frequency standard was off frequency and turning the trimmer cap
> didn't effect the frequency at all!. Is it possible that the 6 pack won't
> function if the frequency is out  of tolerance too far??
> I have to admit that it's been many months since I last had a chance to
> look at it, but I miss using this thing. I used to get stellar audio
> reports  with it (the transmit bandwidth on ssb is 6khz which translates
> into super audio!!)  It would be nice to have some known good modules to
> substitute  to isolate the problem. I have several junker AM3007's here and
> one T-827  and an RT-618 for parts. I don't think the modules from the 618
> are the same as the "A". Any help is welcome!!  THANKS!! Ross 73 W1EKG
> > On December 12, 2019 at 4:26 PM Nick England <navy.radio at gmail.com>
> wrote:
> >
> >
> > My (probably flawed) understanding -
> > By the time of their introduction, there was really not any call for an
> HF
> > transceiver on larger ships.
> > The URC-58 (RF-301) transceiver was installed on smaller craft "pending
> > availability of URC-35" - but I guess there wasn't much reason to replace
> > the URC-58 with something bigger and heavier...
> > On larger ships, you had separate transmit and receive antennas. The
> > receivers were doubled up for diversity for receiving fleet broadcasts
> plus
> > ship-shore terminations. Fewer transmitters were needed because they just
> > didn't need to do that much HF transmission - inter-ship relay and
> tactical
> > circuits were UHF.
> > And then satellites came along.......
> >
> > Nick England K4NYW
> > www.navy-radio.com
> >
> >
> > On Thu, Dec 12, 2019 at 3:57 PM Ray Fantini <RAFANTINI at salisbury.edu>
> wrote:
> >
> > > Mr. B has one of his T-827 listed on EBay now and looking at it can see
> > > it has the 1000 CPS knob so I imagine that makes it the same six pack
> as
> > > the 1051 B/C? think only the oldest straight 1051 did not have that
> > > additional knob?
> > >
> > > You can see the item in question at:
> > >
> > >
> > >
> https://www.ebay.com/itm/NAVY-Military-Radio-T-827b-HF-Transmitter-USB-LSB-AM-CW-FSK-2-30MC/113709635486?hash=item1a799f579e:g:O7YAAOSwSv9cqAWf
> > >
> > > If anyone is interested in one of those things he told me he would sell
> > > them for less. Looking at what's stuffed into a R-1051 and the T-827
> makes
> > > you wonder just how they fit all that into the same box for the RT-618?
> > >
> > > Question: There are tons of R-1051 receivers around, so you know a lot
> > > were deployed in large numbers. For some strange reason seeing some
> T-827
> > > also but the RT-618/URC-35 from my experience just don't show up in the
> > > same numbers. Was the URC-35 a dog? Is that why you don't see them? I
> had
> > > one opportunity to buy one years ago and that was for a lot of money
> so did
> > > not do it and it went fast. The Sunair URC-92 and stuff is plentiful
> and
> > > cheap and at least in my experience a way better radio but it has the
> > > advantage of being ten years newer. I have owned, repaired and sold
> several
> > > of them along with owning several R-1051 receivers and I have a strange
> > > Harris URC-94 that I love but in years of dealing with this stuff have
> > > never owned and only saw maybe one or two URC-35 (RT-618) sets.
> > >
> > > Ray F/KA3EKH
> > >
> > > -----Original Message-----
> > > From: r-1051-bounces at mailman.qth.net <r-1051-bounces at mailman.qth.net>
> On
> > > Behalf Of Nick England
> > > Sent: Thursday, December 12, 2019 2:37 PM
> > > To: R-1051 Discussion Group <r-1051 at mailman.qth.net>
> > > Subject: Re: [R-1051] Six pack attack
> > >
> > > FWIW, I have started a chart of all the module part numbers towards the
> > > bottom of a page at http://www.navy-radio.com/rcvrs/r1051.htm
> > >
> > > I have numbers for several R-1051 models and a couple of RT-618
> models. I
> > > need to dig around for T-827 info.
> > > Please let me know of additions, corrections, etc.
> > >
> > > Nick England K4NYW
> > > www.navy-radio.com
> > >
> > >
> > > On Thu, Dec 12, 2019 at 12:23 PM John P. Caldwell <jcaldwell at rbcos.com
> >
> > > wrote:
> > >
> > > > Ray,
> > > >
> > > > The six pack assembly is "sort of" interchangeable with the T-827,
> > > > depending on the synthesizer module.  Six packs are NOT
> > > > interchangeable between the
> > > > 1051 and 1051B/C.  The 1051 six pack has a 500 CPS synth module, the
> > > > 1051B and later uses a 100 CPS synth module so they can't be
> > > > substituted.  I believe the same applies with the T-827
> > > >
> > > >
> > > >
> > > > John Caldwell
> > > >
> > > > W8SDA (ex WD8INC)
> > > >
> > > >
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