[ARC5] GP-7 Power
Tom Bridgers
tarheel6 at msn.com
Sat Jun 15 00:41:24 EDT 2013
David,
Sounds like pretty sweet music to me!
73's,
-Tom KE4RHH
> From: arc5-request at mailman.qth.net
> Subject: ARC5 Digest, Vol 113, Issue 101
> To: arc5 at mailman.qth.net
> Date: Fri, 14 Jun 2013 22:52:45 -0400
>
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> Today's Topics:
>
> 1. GP-7 Power - A Little Noisy (David Stinson)
> 2. Re: S+N/N ratio results. (Roy Morgan)
> 3. Re: B-36J Radio Operator Position (Scott Johnson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 14 Jun 2013 21:23:56 -0500
> From: "David Stinson" <arc5 at ix.netcom.com>
> To: "ARC-5 Yahoo" <ARC-5radio at yahoogroups.com>, "ARC-5 List"
> <arc5 at mailman.qth.net>
> Subject: [ARC5] GP-7 Power - A Little Noisy
> Message-ID: <EC6C6C22D0674B53B1442ACB095C4A06 at CompaqSR5710F>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I've been working on 800-cycle power to run the
> Navy GP-7 transmitter.
> I think I've gotten the right balance of dynamo-batteries-charger.
> The gloves and face-mask I use when starting the machine
> haven't been all that much trouble, but it's still just
> a little bit noisy. Turn up your speakers:
>
> home.netcom.com/~arc5/DynoStart.mp3
>
> The fire extinguisher has been handy, especially
> when the secondary winding kicks in....
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 14 Jun 2013 22:42:34 -0400
> From: Roy Morgan <k1lky at earthlink.net>
> To: Richard Knoppow <1oldlens1 at ix.netcom.com>
> Cc: ARC5 <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] S+N/N ratio results.
> Message-ID: <744CB085-211B-42C4-B03D-1229CEDA7EB5 at earthlink.net>
> Content-Type: text/plain; charset=windows-1252
>
>
> On Jun 14, 2013, at 7:31 PM, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:
>
> > ? one can just feed from a low impedance and assume the voltage will be close. I mean a terminated output from a 50 ohm generator is 25 ohms and will not be much affected when connected to a receiver with 200 or 400 ohms input.
>
> I've thought about this and thought of taking the idea further:
>
> Make a nice "50 ohm" load for the receiver end of the cable with 50 and 0.5 ohm resistors, take the signal off the 0.5 ohm point and factor in the 100:1 voltage reduction. Almost *any* receiver input impedance or resistance will get one hundredth of the voltage at the load end of the cable.
>
> > Leakage is a real problem.
>
> The 100:1 divider would not help this: you'd be putting 100 times the voltage on the cable (and out some of the leakage points) than would be needed with an unterminated cable (receiver input 50 ohms) or 10 times the voltage if a 10 db pad is used.
>
> I've read that the Collins lab procedure to check sensitivity was to hook the (50 ohm) generator output directly to the receiver with no terminating resistor or pad. Included in what I read was the statement that the receivers had actual input impedances close enough to 50 ohms to make this work out right.
>
> > ... At any rate, getting an approximate measurement on a boat anchor is possible.
>
> Oh, good! I'd rather not thing that all this is in vain.
>
> > A meaningful measurement on a receiver with fractional microvolt sensitivity is quite difficult.
>
> I think that many reports of fractional microvolt sensitivity are suspect.
>
> Roy
>
> Roy Morgan
> k1lky at earthlink.net
> K1LKY Since 1958 - Keep 'em Glowing!
>
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 14 Jun 2013 19:53:20 -0700
> From: "Scott Johnson" <scottjohnson1 at cox.net>
> To: "'john rose'" <brokenthumb at live.com>, <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] B-36J Radio Operator Position
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="US-ASCII"
>
> I think the sound clip is taken from the scene in Strategic Air Command
> where the B-36 flies over the ball park.
>
> Scott W7SVJ
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
> Behalf Of john rose
> Sent: Tuesday, June 11, 2013 7:56 PM
> To: arc5 mail list
> Subject: Re: [ARC5] B-36J Radio Operator Position
>
> This site has some large pages on the B-36 and YB90. There is also a link to
> a recording of one in flight.
> http://www.air-and-space.com/b-36%20survivors.htm
>
> Plan your fall travels around Castle Air Museum's Open Cockpit Day Which is
> September 1 this year.
> http://www.castleairmuseum.org/events.html
>
> ----------------------------------------
> > From: k2gkk at hotmail.com
> > To: arc5 at mailman.qth.net
> > Date: Tue, 11 Jun 2013 16:07:50 -0500
> > Subject: Re: [ARC5] B-36J Radio Operator Position
> >
> > Comprehensive Wikipedia article on B-36:
> >
> > (http://en.wikipedia.org/wiki/Convair_B-36)
> >
> >
> > * * * * * * * * * * *
> > * 73 - Mac, K2GKK/5 *
> > * (Since 30 Nov 53) *
> > * k2gkk at hotmail.com *
> > * Oklahoma City, OK *
> > * USAF & FAA (Ret.) *
> > * * * * * * * * * * *
> >
> >
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