[Milsurplus] Milsurplus Digest, Vol 185, Issue 12

Wed Sep 4 17:23:25 EDT 2019

Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone

-------- Original message --------
From: milsurplus-request at mailman.qth.net 
Date: 9/4/19  2:12 PM  (GMT-08:00) 
To: milsurplus at mailman.qth.net 
Subject: Milsurplus Digest, Vol 185, Issue 12 

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Today's Topics:

   1. Re: [ARC5] Considering GO-9 Transmitter Power Options.
      (David Stinson)
   2. Re: [ARC5] Considering GO-9 Transmitter Power Options.
      (Dennis Monticelli)
   3. Surplus collection in Sacramento, CA area (Don Reaves)
   4. FS Couple books (Hubert Miller)

----------------------------------------------------------------------

Message: 1
Date: Wed, 4 Sep 2019 05:57:42 -0500
From: David Stinson <arc5 at ix.netcom.com>
To: ARC-5 List <arc5 at mailman.qth.net>, milsurplus
	<milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] [ARC5] Considering GO-9 Transmitter Power
	Options.
Message-ID: <db516bf1-2bc3-7992-110d-ea8aeec0382c at ix.netcom.com>
Content-Type: text/plain; charset=utf-8; format=flowed

The MOSFETs are speced for many amps.? Our B+ supplies can't source 
enough current to blow them that way.? But it's a good point.? Once the 
MOSFET is turned on, the concern is whether the B+ transformer and 
rectifier are good with 50 mFd.? If they're designed for, say, 8 mFd cap 
input with choke and 8 mFd out, nailing 50 mFd across the buss is 
probably not a good idea.? A much lower value will likely work fine.
Good catch.

73 DE Dave AB5S.

On 9/3/2019 9:35 PM, AKLDGUY . wrote:
> I notice a 50uF capacitor on the output of the Mosfet. Are there any 
> concerns over inrush current destroying the device?
>

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Message: 2
Date: Wed, 4 Sep 2019 06:05:29 -0700
From: Dennis Monticelli <dennis.monticelli at gmail.com>
To: David Stinson <arc5 at ix.netcom.com>
Cc: ARC-5 List <arc5 at mailman.qth.net>, milsurplus
	<milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] [ARC5] Considering GO-9 Transmitter Power
	Options.
Message-ID:
	<CADgAsSQMqsUop0Yj51sxnt2_H3Du=Mjs0NANV+HwLhHRPAjMoQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

A higher peak-to-average current waveform increases the heating of
transformers (winding resistance), rectifiers (ON resistance) and
capacitors (ESR).  So it is a good idea not to overdo it with filter
capacitance.  It's not just the turn on surge potentially damaging
components, it's the repetitive recharging of the cap on each peak of the
line that heats things up unnecessarily.

Dennis AE6C

On Wed, Sep 4, 2019 at 3:57 AM David Stinson <arc5 at ix.netcom.com> wrote:

> The MOSFETs are speced for many amps.  Our B+ supplies can't source
> enough current to blow them that way.  But it's a good point.  Once the
> MOSFET is turned on, the concern is whether the B+ transformer and
> rectifier are good with 50 mFd.  If they're designed for, say, 8 mFd cap
> input with choke and 8 mFd out, nailing 50 mFd across the buss is
> probably not a good idea.  A much lower value will likely work fine.
> Good catch.
>
> 73 DE Dave AB5S.
>
> On 9/3/2019 9:35 PM, AKLDGUY . wrote:
> > I notice a 50uF capacitor on the output of the Mosfet. Are there any
> > concerns over inrush current destroying the device?
> >
>
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Message: 3
Date: Wed, 4 Sep 2019 15:09:07 -0500
From: Don Reaves <donreaves at gmail.com>
To: Milsurplus at mailman.qth.net
Subject: [Milsurplus] Surplus collection in Sacramento, CA area
Message-ID:
	<CAEjO2La9bJ344_=LM7jPpA-U7XVWfJERzdABBGq_9r=1PmOQiQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

I got a plea for help via my militaryradio web page.

Here is a brief description and with Tim's permission I post the info here.
You can contact Tim via email at tmallen at rd900.org
I have no other info nor pictures.  It was nice of Tim to contact me rather
than just haul this stuff to the landfill.

*Don,*
*My name is Tim and i work for a Reclamation District in West Sacramento
CA, we recently acquired a new shop building and find ourselves burried in
the previous owners communication equipment and military surplus. This is
something I know nothing about but want to see that if appropriate the
stuff finds a home. I am hoping to get some leads or direction on where to
go from here. The equipment ranges from numerous switchboards, to phones
and components of many types and eras although appears to be mostly Korean
War era. There are cases of vaccum tubes, tons of manuals for the
equipment, testing equipment and military PA systems, as well as truck
speakers and specialty bulbs for equipment, aircraft etc. There is even a
submarine sonar station. Any help would be greatly appreciated.*

mailto: tmallen at rd900.org

-- 
Don Reaves  W5OR
8101 Barrett Rd.
Roland AR 72135
Fiber: 501.244.3574
Radio: 501.952.8573
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Message: 4
Date: Wed, 4 Sep 2019 21:12:22 +0000
From: Hubert Miller <Kargo_cult at msn.com>
To: Military Surplus Mail List <milsurplus at mailman.qth.net>,
	"armyradios at yahoogroups.com" <armyradios at yahoogroups.com>
Subject: [Milsurplus] FS Couple books
Message-ID:
	<MWHPR14MB1485A03530368AAEB57712CFE4B80 at MWHPR14MB1485.namprd14.prod.outlook.com>

Content-Type: text/plain; charset="us-ascii"

R-108 109 110/GRC, TM11-898 Mar 1951 with a couple updates to 1960  $10 mailed.

Russian Military Dictionary TM 30-544  Jan. 1945, English - Russian, 5.5 x 8.5 inches, 400 pages, very good+ condition, $10 mailed.

Collins Avionics Publications Index 1965 - 1969, lists C. avionics item, then appropriate manual name and latest revision, no illustrations, 96 full size pages,
metal slide retaining clips are rusted, can be replaced, available at cost of mailing, estimate $5 - 6 or less.
Paypal only.
- Hue Miller
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End of Milsurplus Digest, Vol 185, Issue 12
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