[R-1051] Six pack attack

Thu Dec 19 19:51:47 EST 2019

Ross, how far off frequency is the standard? Do you have any means of generating 5 MHz and injecting it? I don't recall if there is an external reference input or not.

The RT-618, you should be able to see the output on a scope or power meter (with appropriate attenuation) to see if you're getting about 100mW (20dB) out of it. It you are then it is probably the 3007. If not, then it's the RT.

Eugene

-----Original Message-----
From: r-1051-bounces at mailman.qth.net <r-1051-bounces at mailman.qth.net> On Behalf Of ROSS HOCHSTRASSER
Sent: Friday, December 13, 2019 8:30 AM
To: R-1051 Discussion Group <r-1051 at mailman.qth.net>; Nick England <navy.radio at gmail.com>
Subject: Re: [R-1051] Six pack attack

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-U
> > SB-LSB-AM-CW-FSK-2-30MC/113709635486?hash=item1a799f579e:g:O7YAAOSwS
> > v9cqAWf
> >
> > 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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