[R-390] R-390 Digest, Vol 62, Issue 20

Sun Jun 21 16:16:40 EDT 2009

PS to Miles Anderson:
Sag Harbor! I almost ended my days there.Back in the early 60's, I rented a 
sailboat for the day - they warned me that there were problems in bringing 
down the main sail if I would have to- I  had a funny feeling that something 
was wrong and sailed back just before coming out into the open sea..
Despite the weather being perfect, and weather report predicted fine 
weather, it turns out that one of the worst storms recorded came out of 
nowhere an hour after I sailed back -- the storm was so bad that ocean going 
vessels went down. That taught me to  trust my instincts.

----- Original Message ----- 
From: <r-390-request at mailman.qth.net>
To: <r-390 at mailman.qth.net>
Sent: Sunday, June 21, 2009 6:00 PM
Subject: R-390 Digest, Vol 62, Issue 20

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> Today's Topics:
>
>   1. Re: R-390 Digest, Vol 62, Issue 18 (Richard)
>   2. R-390A B+ current drain (Henry Meils)
>   3. R-390A B+ current drain (K2CBY)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 20 Jun 2009 17:23:36 -0500
> From: Richard <theprof at texoma.net>
> Subject: Re: [R-390] R-390 Digest, Vol 62, Issue 18
> To: r-390 at mailman.qth.net
> Message-ID: <4A3D6168.90602 at texoma.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I have a Dittmore-Freimuth I bought from Fair Radio a dozen years ago.
> All modules excpet the IF Deck carrying the same 1968 contact number and
> they are EAC.  What I read was theat they made great filters but
> everyting else was EAC.
>
> 73 de Richard W5SRB
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Thu, 18 Jun 2009 19:05:25 -0700
>> From: "mparkinson1" <mparkinson1 at socal.rr.com>
>> Subject: [R-390] R 390a Dittmore-freimuth
>> To: <r-390 at mailman.qth.net>
>> Message-ID: <C30AFC81645B410A859FDA070D9946FF at MATT>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> This item is up on ebay and if I recall right the modules should be 
>> marked Dittmore-freimuth not EAC.
>> Can anyone shed some light on this I think the seller is reading the tag 
>> and selling it as a Dittmore-freimuth  receiver.
>> I remember one being sold and all the modules were marked
>> Dittmore-freimuth
>> Am I correct???
>> Matt Parkinson Military Equipment & R 390A Depot Center
>>
>>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 21 Jun 2009 07:04:03 +0200
> From: "Henry Meils" <meils at get2net.dk>
> Subject: [R-390] R-390A B+ current drain
> To: <r-390 at mailman.qth.net>
> Message-ID: <FB092751561640E7A20091B6FBD1505B at henry4518e5ecc>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> I inserted a mA meter into the B+ line at L106:
>
> The only item I could find via Google states that the R-390A draws about 
> 100 ma - my own test show a max. of about 180 mA (Calibrate Mode, BFO on, 
> RF on max. and a min. of about 59 mA in Standby mode (80 mA in Stdby with 
> BFO on)- but with both output AF tubes removed).
> Normal operation, BFO on, runs from 130mA to 160mA: RF gain resp. min & 
> max.(all tubes in place)
>
> The two 6AK6 AF output tubes draw resp. 20 & 30 mA: I haven't measured 
> grid bias V yet but plate current indicates normal operation. The two 1st 
> stage AF tubes do not warm up noticeably.
> I checked to see if L106 might have shorted turns - inserted a 2nd 
> outboard choke in series with L106 also warms up to roughly the same temp 
> as L106.
> I don't like the fact that the entire AF module chassis warms up but it is 
> not due to excessive plate/SG current drain - there are no overheated 
> components (R) in the module so I suppose this is how it is supposed to be 
> but what do others here experience ?
>
> I intend to remove all modules and individual tubes, one by one, in order 
> to make a complete current-drain chart. It's just simple arithmatic, 
> measuring B+ current drains at all stages.
>
> Has any one on this thread made similar measurements, particularly total 
> B+ current drain, max/min ?
>
> Have fun.
>
> Henry - OZ1UF, Cph, DK
>
> ------------------------------
>
> Message: 3
> Date: Sun, 21 Jun 2009 09:23:46 -0400
> From: K2CBY <k2cby at optonline.net>
> Subject: [R-390] R-390A B+ current drain
> To: R-390 Mailman <R-390 at Mailman.qth.net>
> Message-ID: <B648A8194ABE40A09D9F4347D0B46F9A at milesdesk>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
> Before jumping to conclusions about the condition of the power supply 
> choke
> you should note that the AF chassis also contains the voltage regulator
> tubes.
>
> More to the point, it contains the voltage dropping resistors connected to
> the
> voltage regulators. Those resistors are firmly bolted (read heat sinked) 
> to
> the AF chassis. I am not surprised that the chassis runs warm.
>
> Miles B. Anderson, K2CBY
> 16 Round Pond Ln
> Sag Harbor, NY 11963 USA
> Tel.: (631) 725-4400
> Fax: (631) 725-2223
>
> E-mail: k2cby at optonline.net
>
>
>
>
> ------------------------------
>
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> End of R-390 Digest, Vol 62, Issue 20
> *************************************

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