[R-390] Comparing R390A w/Period Devices

Thu Jan 11 12:10:03 EST 2018

Hi

Take a look at the drift requirements for WSPR. There are a couple of modes and
some of them are well past anything the stock 390 can handle. That’s not a knock
on the 390. There are a lot of SDR’s and “lot of buttons” radios that can’t do the
job on those modes either. Plan on at least a 24 hour warmup before you start 
playing. 

Bob

> On Jan 11, 2018, at 11:17 AM, Stan Gammons <s_gammons at charter.net> wrote:
> 
> 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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