[R-390] computer swtiched source
jm
josemic at gmail.com
Sun Jan 30 14:58:52 EST 2022
Hi guys,
I've realised that the noise level increases when the power source of the
laptop is on. In that case, the noise makes extremely difficult to hear
weak signals.
Found on ebay some kind of device called "EMI individual phase noise
filter" to be placed between the line and the radio. It's very cheap but I
don't know whether or not would be useful.
Does somebody have any experience with such type of device?
Thanks, and regards
Jose
EA8DCP
El dom, 30 ene 2022 a las 19:29, <r-390-request at mailman.qth.net> escribió:
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> Today's Topics:
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> 1. Re: R-390A Radio testing and repair in Houston or Texas
> (Alan Victor)
> 2. 390 RF Deck Replacing After Removal (Tisha Hayes)
> 3. Re: 390 RF Deck Replacing After Removal (Bob kb8tq)
> 4. Re: R-390A Radio testing and repair in Houston or Texas (Larry H)
> 5. Mason Labs R-390A? (W2HX)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 28 Jan 2022 08:44:46 -0500
> From: Alan Victor <amvictor at ncsu.edu>
> To: Larry H <larry41gm at gmail.com>
> Cc: "R-390 at mailman.qth.net" <r-390 at mailman.qth.net>
> Subject: Re: [R-390] R-390A Radio testing and repair in Houston or
> Texas
> Message-ID:
> <CAO-B_Tc9rne+5HKGdMHtp206ymFXcnzja1501v-=YQ1=
> KO2XbA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> The DEAD Radio R390A is a great read! And a treasure of good info. This
> would be a good place to start Ken.
> Good Luck,
>
> Thanks Larry,
>
> Alan
>
> On Fri, Jan 28, 2022 at 8:35 AM Larry H <larry41gm at gmail.com> wrote:
>
> > Ken, It looks like no one has responded to your request, so you might
> > consider checking with your local ham club. Or, if you are so inclined,
> > look at the 'dead units' section of the pearls here: dead units (
> > r-390a.net)
> > <https://www.r-390a.net/Pearls/dead_units.pdf>. There are numerous
> folks
> > here that can help you with questions.
> >
> > Regards, Larry
> >
> > On Tue, Jan 25, 2022 at 8:56 AM K PERALES <kenperales at comcast.net>
> wrote:
> >
> > > I have a 390 I got a number of years ago that I use to copy code like I
> > > did back in late 60s and it suddenly went quite with not even the lower
> > AM
> > > radio stations. Given what it weighs, sending it to any of the people
> I
> > > have heard of that work on these oldies costs way to much.
> > >
> > > Ken Perales
> > >
> > >
> > > ______________________________________________________________
> > > R-390 mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > > Help: http://mailman.qth.net/mmfaq.htm
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>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 28 Jan 2022 11:42:19 -0600
> From: Tisha Hayes <tisha.hayes at gmail.com>
> To: R390A <r-390 at mailman.qth.net>
> Subject: [R-390] 390 RF Deck Replacing After Removal
> Message-ID:
> <CAACTF11nkwjcmUpmX=UXoMnHF-zX7buZLVJ4O-qp26=
> uLeYYEQ at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Fiddling with that switch on the bottom of the RF deck is the biggest PITA!
>
> I had problems with one of my receivers where I had intermittent
> performance on only some of the bands; The radio would go mostly deaf in 1
> MHz positions and it was intermittently happening. The problem boiled down
> to imperfect connections on that switch.
>
> It was frustrating because you need to do a major disassembly to get to it
> each time you make an adjustment and whatever adjustment you made was not
> always certain to fix the issue. You could get it to disappear on one band;
> only to have it now crop up in a different band.
>
> It took a couple of days to resolve and I had to just step away from the
> radio a half-dozen times out of frustration; I wanted to toss the entire
> receiver out of the second story window and down in to the yard, where I
> could dig a deep hole and bury the radio.
>
> I guess that the next level of frustration I could ever possibly get would
> be in trying to adjust the compensator disk on the PTO. Thank goodness I
> had good PTO's with linearity!
>
> ------------------------
>
> Tuning racks, stagger tuning the IF, finding the right tube for each
> socket... child's play when compared to that switch.
>
> Years of therapy have gotten me over the trauma, but I will not even lift
> up one of the spare RF decks and look at the underside... That would give
> me flashbacks.
>
> *Ms. Tisha Hayes, AA4HA*
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 28 Jan 2022 14:39:41 -0500
> From: Bob kb8tq <kb8tq at n1k.org>
> To: Tisha Hayes <tisha.hayes at gmail.com>
> Cc: R390A <r-390 at mailman.qth.net>
> Subject: Re: [R-390] 390 RF Deck Replacing After Removal
> Message-ID: <F4E47365-0C50-4785-A0F1-3DCD28E81ACA at n1k.org>
> Content-Type: text/plain; charset=utf-8
>
> Hi
>
> You do *not* want to know what the line workers at Motorola thought
> about adjusting the PTO linearity. Twenty years later, if you brought up
> the R390, you got an earful (and then some) from those gals about just
> what a horrible job it was ?.
>
> Bob
>
> > On Jan 28, 2022, at 12:42 PM, Tisha Hayes <tisha.hayes at gmail.com> wrote:
> >
> > Fiddling with that switch on the bottom of the RF deck is the biggest
> PITA!
> >
> > I had problems with one of my receivers where I had intermittent
> > performance on only some of the bands; The radio would go mostly deaf in
> 1
> > MHz positions and it was intermittently happening. The problem boiled
> down
> > to imperfect connections on that switch.
> >
> > It was frustrating because you need to do a major disassembly to get to
> it
> > each time you make an adjustment and whatever adjustment you made was not
> > always certain to fix the issue. You could get it to disappear on one
> band;
> > only to have it now crop up in a different band.
> >
> > It took a couple of days to resolve and I had to just step away from the
> > radio a half-dozen times out of frustration; I wanted to toss the entire
> > receiver out of the second story window and down in to the yard, where I
> > could dig a deep hole and bury the radio.
> >
> > I guess that the next level of frustration I could ever possibly get
> would
> > be in trying to adjust the compensator disk on the PTO. Thank goodness I
> > had good PTO's with linearity!
> >
> > ------------------------
> >
> > Tuning racks, stagger tuning the IF, finding the right tube for each
> > socket... child's play when compared to that switch.
> >
> > Years of therapy have gotten me over the trauma, but I will not even lift
> > up one of the spare RF decks and look at the underside... That would give
> > me flashbacks.
> >
> > *Ms. Tisha Hayes, AA4HA*
> > ______________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:R-390 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 28 Jan 2022 20:24:20 -0800
> From: Larry H <larry41gm at gmail.com>
> To: R-390 Forum <r-390 at mailman.qth.net>
> Subject: Re: [R-390] R-390A Radio testing and repair in Houston or
> Texas
> Message-ID:
> <
> CAOSJ_nuYX+VZHdLGxJQDGF1a+L1GKON6JJKYYEd9mFMDhLg5bA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Ken told me that he was contacted by 2 folks from the list and that he felt
> that should be good.
>
> Regards, Larry
>
>
> ------------------------------
>
> Message: 5
> Date: Sun, 30 Jan 2022 19:27:11 +0000
> From: W2HX <w2hx at w2hx.com>
> To: "r-390 at mailman.qth.net" <r-390 at mailman.qth.net>
> Subject: [R-390] Mason Labs R-390A?
> Message-ID:
> <
> 44078ba31eed41aaaa26003d43ec12dc at EXBE015SV3.NA02.MSEXCHANGEOUTLOOK.COM>
>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi all,
>
> I came across a guys about 30 minutes from me who is selling an EAC R-390A
> radio. I haven't asked what he wants for it but I thought it was
> interesting. It has some mods by Mason Labs. He said when he bought it
> (ages ago) the seller told him it was used at NASA. Here are some pix of
> some of the mods.
> https://w2hx.com/?prefix=x/R-390A/Mason%20Labs/
>
> Is this a well-known set of mods or a rarity? Anything about them that
> improves the R-390A? Or are they just some specialized use case.
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel:
> https://www.youtube.com/c/w2hx-channel/videos
>
>
>
>
>
>
> ------------------------------
>
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>
> End of R-390 Digest, Vol 212, Issue 13
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