[R-390] UR 390

Wed Jan 31 22:05:31 EST 2007

SR-60 VLF rings a bell. I think it was a 60 kHz VLF receiver. If it was 
the one I am thinking about, it had a meter on the left side that would 
read phase, and a mechanical dial that set delay on microseconds. It had 
a head that was a shielded loop with a built-in transistor preamp. You 
remoted it outside someplace. The SR-60 had a phase shifter in it so you 
could phase-shift the 60 kHz carrier to compensate for prorogation 
delay, and read off the delay between your standard and the WWVB 
carrier. The R-390 is used to receive WWV as a Sanity Check and 
secondary since I remember the SR-60 did not let you decode WWVB.

Transmaster wrote:
> Here is the text of the caption from the Leger Laboratories ad' from the
> March 1968 "73" magazine.:
>
> "This is the primary frequency standard. It consists of a Collins
> UR-390 receiver, a Hewlett=Packard counter and an SR-60 VLF phase
> comparators. this setup is used to monitor WWVB on 60 kHz and gives
> us a frequency standard traceable to NBS for
> frequency measurement."
>
> If this receiver is working at 60 kHz could this be a VLF version of
> the R390/URR or is it a miss identified R-289/URR
>
>
> Ken
>
> On 1/31/07, Joe Foley <redmenaced at yahoo.com> wrote:
>> The official designation of that radio is the
>> R-390/URR. Maybe someone who made the ad didn't quite
>> understand the nomenclature.
>>
>> Joe
>>
>>
>>
>> --- Transmaster <22hornet at gmail.com> wrote:
>>
>> > Yes that is what it looked like. I am aware of the
>> > R390 non A but I
>> > have never seen one called a UR-390 I was wondering
>> > if this might be
>> > yet another type of R390, non A.
>> >
>> >
>> > Ken
>> >
>> > On 1/31/07, Bob Young <youngbob53 at msn.com> wrote:
>> > > I am no expert, but if you're asking what is a
>> > R-390, it was the predecessor
>> > > to the A and had (I believe someone will correct
>> > me and add additional info
>> > > I'm sure) LC filters instead of mechanical
>> > filters, also had more tubes and
>> > > supposedly was more complex. I think they had 32
>> > tubes, the A was supposed
>> > > to be a cost reduced version, this topic can get a
>> > little controversial
>> > > around here, haha! You will see them on ebay
>> > occasionally. I have a 388 on
>> > > the way, my radio after that will be a 390. The
>> > way you can tell at a glance
>> > > is that the ant. trimmer is off on the right side
>> > I believe and the plate is
>> > > right where you desribed.
>> > >
>> > > Bob Young
>> > > Millbury, Ma
>> > > (no letters yet)
>> > >
>> > >
>> > > >From: Transmaster <22hornet at gmail.com>
>> > > >To: R-390 <R-390 at mailman.qth.net>
>> > > >Subject: [R-390] UR 390
>> > > >Date: Wed, 31 Jan 2007 07:53:20 -0700
>> > > >
>> > > >I was looking through a 1970 issue of '73
>> > magazine. In a ad' for an
>> > > >outfit which repaired and calibrated radios, and
>> > test equipment. There
>> > > >is a photo which shows a rack mount of gear used
>> > to receive WWV as a
>> > > >calibration standard. In the rack is a radio the
>> > caption identifies
>> > > >as a UR-390, the front panel on the radio is the
>> > same as my R-390A
>> > > >except there is no antenna trimmer and the
>> > nomenclature plate is
>> > > >installed where the trimmer would have been. I
>> > tried to scan the
>> > > >photo in but it is to blurred to make it worth
>> > sending. I have never
>> > > >read of a UR-390 mentioned on this forum. What
>> > flavor of 390 is this
>> > > >receiver?
>> > > >
>> > > > Ken de W7ITC
>> > > >
>> > > >--
>> > > >Kenneth A. Crips, W7ITC Home of the Chew Crew,
>> > Red Headed
>> > > >Irish Terrier House Ninjas, Chic', and Cowboy
>> > > >10th degree black belts in Mouch Fue, Bed Fue,
>> > and
>> > > >Con Artist Fue.
>> > >
>> >
>> >_____________________________________________________________
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>> > >
>> > >
>> > >
>> >
>> >
>> > --
>> > Kenneth A. Crips, W7ITC Home of the Chew Crew, Red
>> > Headed
>> > Irish Terrier House Ninjas, Chic', and Cowboy
>> > 10th degree black belts in Mouch Fue, Bed Fue, and
>> > Con Artist Fue.
>> >
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>>
>>
>>
>>
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>

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