[R-390] Comparing R390A w/Period Devices

[Stan Gammons]

Yes.  Parking the R-390A on one of the WSPR frequencies, 30 meters most likely, and tinkering with MDSR is one thing I plan to do.  Not sure if I'll have to have a product detector to do that. Guess I'll find out soon :)

73

Stan
KM4HQE



On January 11, 2018 9:57:13 AM CST, Steve Toth via R-390 <r-390 at mailman.qth.net> wrote:
>Sounds like the perfect receiver for today's digital modes to me -
>looks like we've come full circle!
>- Steve  W7SJT"Always look for a positive solution then Improvise,
>Adapt, and Overcome"
>"Sometimes it is the people who no one imagines doing anything, who do
>the things that no one can imagine".....
>
>
> 
>
>      From: Roger Ruszkowski <flowertime01 at wmconnect.com>
> To: r-390 at mailman.qth.net 
> Sent: Wednesday, January 10, 2018 4:52 PM
> Subject: Re: [R-390] Comparing R390A w/Period Devices
>   
>
>Fellows,
> 
>Way back yonder Wei-Li  included history and details of muchbusiness
>things in his compiled Pearls of Wisdom. The Y2K manual is the in
>handmaintenance manual. When I read that you are listening to an
>R-390/URR or evenmore so an R-390A/URR I ask that nature not include
>your soul in any upcomingground plans. May good ESD protocols be with
>all your days. 
> 
>Author Topic: Collins R-390A Resource Page (Read 4022 times)
>Here are several sources for information on the legendaryCollins/US
>Army joint design R-390A/URR as well as the Collins R-390/URR
>radioreceiver. Please note that they are NOT the same.
>http://www.r-390a.net/ ThisWeb site is the ultimate resource for
>information for the R-390A. It haseverything you ever wanted to know
>about the R390A. Kudos to Al, WA0HQQ, forall his work compiling this
>outstanding reference source. I am proud to belisted as a contributor.
>MisterMike, W1RC
> 
>The history line suggests the Collins R-390/URR was to be aninterface
>transform and selective frequency filter needed to match the
>impedancebetween an antenna and a teletype demodulator in an HF
>teletype receivingsystem. Internal circuits and front panel meters
>enabled visual tuningindication far superior to just an audio output
>signal level. Listening to a CollinsR-390/URR as if it were a Vintage
>Zenith Transoceanic, shortwave Radio wasnever part of the design
>requirements. That is why there is a 455 KHz output onthe rear panel.
>Detect the signal your way and amplifier it your way. Get outof the box
>and leave it alone.
> 
>The Collins (and other corporations) RF engineers knew the coretuned
>oscillators and the selectivity of the RF deck were the product
>Collinswas the first to offer in the market place. The other usual
>features of the Armstrongsuper heterodyne receiver were included in the
>test instrument packaging. Itlooks like a receiver to us. You know a
>Picasso when you see one. You know aCollins when you see one.
>Furthermore, you have learned to distinguish the subtledifferences in
>products produced in house, and products produced by outsource
>franchisecontractors. (Helena-Rubinstein) Collins wanted SSB the first
>demo stuff was not stableand the feature was dropped. The entire band
>pass of the audio deck was tocut off as much out of  TTY tone band pass
>noise as reasonable to present the teletypedemodulator the best input
>possible for good clean text copy.
> 
>OMG a ditty receiver. Yes, and you tailor the keyed tone youcopy with
>headsets to your audio satisfaction with some left hand
>synthesizercontrols. The Army and Navy long haul logistics
>communications had nouse for voice or manual Morris. Voice is tactical
>application. United States Military logistics was via teletype. Over
>wire since1914 and wireless since 1918. Utilizing a Collins R-390/URR
>for human audio wasnot a military activity.
> 
>You need an app for that. It bolts in the rack either under orover the
>R-390/URR. It draws power from its leash. Connecting a short
>interconnectdongle cable from the R-390/URR to the app completes the
>installation of theapp. A reboot is not required. From day one American
>Tax Payers were not goingto have the military setting around all day
>listening to talk radio.
>
>Respectfully,
>
>Roger Ruszkowski
> 
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