[R-390] R-390 Digest, Vol 203, Issue 1

Manfred Antar (KN6KBS) manfredantar at gmail.com
Wed Mar 17 22:37:41 EDT 2021 

My FL-101’s in two R390’s were leaky
Showing fault on ISOBAR Ultra Surge Protector. Although the radio worked fine
I removed the FL-101 and replaced with a Corcom 3EF1 Power Line EMI Filter 250V 3A 50-60Hz
I think I drilled a couple of small holes to mount the Corcom.
It fits right in the hole where the FL-101 was. Uses a regular Computer type AC cord.
I know it’s not stock, but it is safer and the original filter can be put back in place.

Works great !!!

> On Mar 17, 2021, at 5:54 PM, T Via <charlestimothyvia at gmail.com> wrote:
> 
> The FL-101 is potted and not repairable from a practical standpoint. Has
> capacitors leaky enough to trip a ground fault outlet. Other than that
> filter still seems to work as intended. If a good one is not found the work
> arounds are as follows:
> 1. Use a grounded (3 wire outlet) that is not a ground fault outlet For
> safety have a ground wire from the R390 to any other vintage equipment that
> can be touched simultaneously with the R390 to avoid a potentially
> dangerous shock from the "hot" chassis of the R390.
> 
> 2. Use a line isolator transformer with the ground fault outlet but you
> still need to have a chassis ground wire to other equipment as mentioned
> above.
> 
> 3. Discard the filter and replace it with a generic line filter with a
> similar schematic diagram.
> 
> 4. Wire it up without any filter. Whether this is practical depends on how
> much line noise there is in your shack.  Mine works fine without any filter.
> 
> 5. Try a line filter from a R390A (I have not done this but it seems like
> an idea to consider. But it wont fit in the existing hole in the chassis
> for the R390 filter
> 
> r390s
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> r390
> 
> On Wed, Mar 17, 2021 at 6:45 PM <r-390-request at mailman.qth.net> wrote:
> 
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>> Today's Topics:
>> 
>>   1. Miscellaneous R390/URR parts (Larry H)
>>   2. R390 V511 / Z503 Wiring (thoyer)
>>   3. Re: Miscellaneous R390/URR parts - sold (Larry H)
>>   4. FL-101 for R390/URR (Ron.K3PID)
>>   5. Re: FL-101 for R390/URR (Fred Moore)
>> 
>> 
>> ----------------------------------------------------------------------
>> 
>> Message: 1
>> Date: Fri, 26 Feb 2021 21:57:38 -0800
>> From: Larry H <larry41gm at gmail.com>
>> To: R-390 Forum <r-390 at mailman.qth.net>
>> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
>> Subject: [R-390] Miscellaneous R390/URR parts
>> Message-ID:
>>        <
>> CAOSJ_nss6R1cZ4cXncW8Ew-1P0wMb6DQzixT2zd9mRr3vDVFzw at mail.gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>> 
>> Hi all,  I'm selling the rest of my R390/URR parts.  1. 5 tuning racks, 2.
>> 2 rack springs. 3. 12 tuning slugs.  4. 1 original 'green' gear. 5. 1
>> oldham coupler slotted center washer (7/8" diameter). 6. 1 rg213 (like rg8)
>> coax cable 10.5" long with a 90 degree male C connector on both ends.  All
>> appear to be in good condition except for the racks and slugs (they are
>> ok).
>> 
>> I'd like to sell it all as 1 package.  How about $15 +shipping (about $10)?
>> 
>> Regards, Larry
>> 
>> 
>> ------------------------------
>> 
>> Message: 2
>> Date: Sat, 27 Feb 2021 12:09:11 -0500
>> From: "thoyer" <thoyer1 at verizon.net>
>> To: <R-390 at mailman.qth.net>
>> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
>> Subject: [R-390] R390 V511 / Z503 Wiring
>> Message-ID: <065F1309EE244B08ABD8BB7198BA803F at TomHP>
>> Content-Type: text/plain;       charset="us-ascii"
>> 
>> Have my 390 working but while doing the If alignment, I was having trouble
>> getting Z503 to peak. Upon inspection, someone was in this area before as
>> Z503 only had one nut holding it in.
>> 
>> Now I have been through the Z503 follies previously on an R389 I repaired
>> for a friend so I'm pretty familiar with this area. We ended up having to
>> source another Z503 as his was open.
>> 
>> Mine measure 5.5 ohms per the manual. I have another IF module here where
>> Z503 measures 15 ohms.............
>> 
>> OK, getting off topic... I ended up removing Z503 and found the insulation
>> damaged on the wire that connects it to the plate of V509 - good, maybe
>> this
>> is shorting somewhere and causing my issue.
>> 
>> Before reassembling I inspected the whole area checking values and wiring.
>> I
>> noticed that pin 1 of V511 ties to the 470 ohm side of Z503. Per the
>> schematic the only thing on Z503 should be the 470 ohm (2200 on sch) and
>> the
>> 0.01uf cap (R554 and C542). But as I said, there is a wire at that junction
>> that runs over to V511-1. I checked my "parts module" and it is wired the
>> same way so I'm "assuming" that this is a circuit change that is not
>> reflected in the schematic????
>> 
>> The IF module in my radio is SN 388 (Collins). No MOD indicated
>> 
>> The parts module is a Motorola SN 1229, MOD 1 indicated.
>> 
>> Tom
>> W3TA
>> 
>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 3
>> Date: Sat, 27 Feb 2021 17:22:51 -0800
>> From: Larry H <larry41gm at gmail.com>
>> To: R-390 Forum <r-390 at mailman.qth.net>
>> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
>> Subject: Re: [R-390] Miscellaneous R390/URR parts - sold
>> Message-ID:
>>        <CAOSJ_ns2EJDEAmJZsN9bMzf6143yJPeYaSqYU6J-7sJaTg=
>> 86g at mail.gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>> 
>> Thank you all for the large response.  They've been sold to the 1st
>> responder.
>> 
>> Regards, Larry
>> 
>> On Fri, Feb 26, 2021 at 9:57 PM Larry H <larry41gm at gmail.com> wrote:
>> 
>>> Hi all,  I'm selling the rest of my R390/URR parts.  1. 5 tuning racks,
>> 2.
>>> 2 rack springs. 3. 12 tuning slugs.  4. 1 original 'green' gear. 5. 1
>>> oldham coupler slotted center washer (7/8" diameter). 6. 1 rg213 (like
>> rg8)
>>> coax cable 10.5" long with a 90 degree male C connector on both ends.
>> All
>>> appear to be in good condition except for the racks and slugs (they are
>> ok).
>>> 
>>> I'd like to sell it all as 1 package.  How about $15 +shipping (about
>> $10)?
>>> 
>>> Regards, Larry
>>> 
>> 
>> 
>> ------------------------------
>> 
>> Message: 4
>> Date: Wed, 17 Mar 2021 17:29:50 -0500
>> From: "Ron.K3PID" <ron.k3pid at sbcglobal.net>
>> To: R-390 at mailman.qth.net
>> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
>> Subject: [R-390] FL-101 for R390/URR
>> Message-ID: <1UYvxyip9i.1KJQ9ywjQKz at zeus>
>> Content-Type: text/plain; charset="utf-8"
>> 
>> I am in need of the power line entry filter which includes the 4 pin
>> connector
>> for the R390/URR. I assume that the potted assembly can not be opened for
>> repair!
>> 
>> Ron K3PID
>> 
>> 
>> ------------------------------
>> 
>> Message: 5
>> Date: Wed, 17 Mar 2021 22:45:17 -0000
>> From: "Fred Moore" <fred_moore at usa.net>
>> To: "Ron.K3PID" <ron.k3pid at sbcglobal.net>, <fred_moore at usa.net>
>> Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
>> Subject: Re: [R-390] FL-101 for R390/URR
>> Message-ID: <363ZcqwSR4832Set.1616021117 at web13.cms.usa.net>
>> Content-Type: text/plain; charset=ISO-8859-1
>> 
>> Ron,
>> 
>> Is it potted, or simply soldered?  If soldered, you may be able to replace
>> the
>> capacitors, if needed.  Of course, if there is a replacement available,
>> that
>> is easiest.
>> 
>> -Fred
>> 
>> ------ Original Message ------
>> Received: Wed, 17 Mar 2021 10:30:24 PM GMT
>> From: "Ron.K3PID" <ron.k3pid at sbcglobal.net>
>> To: fred_moore at usa.netCc: Collins R-390 HF Receiver List
>> <r-390 at mailman.qth.net>
>> Subject: [R-390] FL-101 for R390/URR
>> 
>> I am in need of the power line entry filter which includes the 4 pin
>> connector
>> 
>> for the R390/URR. I assume that the potted assembly can not be opened for
>> repair!
>> 
>> Ron K3PID
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>> 
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>> 
>> End of R-390 Digest, Vol 203, Issue 1
>> *************************************
>> 
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