[ARC5] ARC5 Digest, Vol 172, Issue 25
releazer at earthlink.net
releazer at earthlink.net
Fri May 11 15:49:31 EDT 2018
1960 ARC Catalog at : http://www.bunkerofdoom.com/lit/ARC_1960_cat.pdf
Wayne
WB5WSV
-----Original Message-----
>From: arc5-request at mailman.qth.net
>Sent: May 11, 2018 3:28 PM
>To: arc5 at mailman.qth.net
>Subject: ARC5 Digest, Vol 172, Issue 25
>
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>Today's Topics:
>
> 1. Re: Aircraft Radio Catalog (Jay Coward)
> 2. Re: TCS 50-Ohm Matching Configurations. (J Mcvey)
> 3. Re: TCS 50-Ohm Matching Configurations. (Dennis Monticelli)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Fri, 11 May 2018 11:23:52 -0400
>From: Jay Coward <jcoward5452 at aol.com>
>To: arc5 at ix.netcom.com, scr287 at att.net, arc5 at mailman.qth.net
>Subject: Re: [ARC5] Aircraft Radio Catalog
>Message-ID: <1634fcd1acc-1db3-146d8 at webjas-vaa186.srv.aolmail.net>
>Content-Type: text/plain; charset="utf-8"
>
>
>What sort of components were A.R.C. making for 24 GHz at that time?
> Jay KE6PPF
>
>
>-----Original Messageay
>-----
>From: David Stinson <arc5 at ix.netcom.com>
>To: 'Jack Antonio' <scr287 at att.net>; 'ARC-5 List' <arc5 at mailman.qth.net>
>Sent: Thu, May 10, 2018 5:43 pm
>Subject: Re: [ARC5] Aircraft Radio Catalog
>
>
>
>-----Original Message-----
>From: Jack Antonio
>Subject: [ARC5] Aircraft Radio Catalog
>
>In going through my A.R.C. stuff, I found
>a 1946 Component Parts catalog from A.R.C.
>----------
>
>I have that same catalog here. That they were
>doing serious work on 24 GHz in WWII I found
>surprising.
>73 Dave S.
>
>
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>Message: 2
>Date: Fri, 11 May 2018 15:43:46 +0000 (UTC)
>From: J Mcvey <ac2eu at yahoo.com>
>To: arc5 at mailman.qth.net, DSP3 <jeepp at comcast.net>
>Subject: Re: [ARC5] TCS 50-Ohm Matching Configurations.
>Message-ID: <1543941434.200990.1526053426826 at mail.yahoo.com>
>Content-Type: text/plain; charset="utf-8"
>
> Why is everyone loathe to use a 4:1 or 9:1 unun autotransformer to match these radios?If your antenna is in the 30 to 90 ohm area, it's a home run every time.These radios were desined for very short antennas and have resistance range of 5 to 12 ohms and can tune against a reactance? of zero up to 800 ohms or so.
>
>The series cap method depends a lot? on the cable length and what impedance is being presented due to that length.The shunt? variable cap on the output will ( hopefully) produce an L section with the internal inductor that will tune the appropriate range.Of coarse, the other variable with any of this stuff is characteristics of your local antenna...
>
> On Friday, May 11, 2018, 10:59:19 AM EDT, DSP3 <jeepp at comcast.net> wrote:
>
>
>Dave,
>
>Very good info.? I tried them out bhut the one that falls into place for me is using Tap 5.? I can't get power out using Tap 4 or 6?? The R-24 Q-5er crapped out yesterday but found a bad cap buried in the rear area, the audio primary bypass was bad.? That's a new one?? Back on the air.? I run about 600v and tuned indicating 165ma for 38 watts output.? Scope looks quite good.? I will archive your data in my ARC-2 manual.? Who knows who will need it in 30 years????
>
>Jeep - K3HVG
>
>
> On 5/11/2018 7:50 AM, David Stinson wrote:
>
> Yesterday, I took a few minutes to test three of
>the suggested capacitive matching methods which
>adapt a 50-Ohm non-reactive load to the output
>of TCS and similar transmitters. The ARC-2 is
>on the bench and it has an output circuit similar
>to the TCS, so used that for the test.
>Can get some time to do this on the TCS
>if anyone is interested. This wattmeter has not
>been calibrated in some time, so take these
>Power readings as relative.
>
>ARC-2 Primary 27V. Dynamotor B+
>All tests at 3890 KC, tuned for max out.
>
>100 pFd capacitor in series to load.
>40 W out.
>130 mA PA current.
>ARC-2 Ant Tuning 472
>
>1000 pFd ANT to ground.
>40 W out.
>145 mA PA current.
>ARC-2 Ant Tuning 652
>
>Capacitive Divider (TCS tuning box)
>270 pFd ANT to Load,
>1370 pFd, Load to Ground.
>44 W out.
>190 mA PA Current.
>ARC-2 Ant Tuning 576
>
>"Each to their own," of course.
>My preference is to trade 10% of power out
>for a 30% reduction in PA current, which is
>not only easier on the PA, but makes fully
>modulating the rig that much easier as well.
>
>GL OM ES 73 DE Dave AB5S
>
>
>
>
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>------------------------------
>
>Message: 3
>Date: Fri, 11 May 2018 12:28:26 -0700
>From: Dennis Monticelli <dennis.monticelli at gmail.com>
>To: J Mcvey <ac2eu at yahoo.com>
>Cc: ARC-5 Maillist <arc5 at mailman.qth.net>
>Subject: Re: [ARC5] TCS 50-Ohm Matching Configurations.
>Message-ID:
> <CADgAsSQfD7qkmXeVibAxr-obwSYaY_zBkfNs+ZUd_0hsyyT-uA at mail.gmail.com>
>Content-Type: text/plain; charset="utf-8"
>
>The unun transformer is a fine solution. It can be built broadband style
>with integer ratios as suggested or inasmuch as our sets are single band,
>just via the old-fashioned auto-transformer technique. A torroid insures
>good coupling in both casees.
>
>Dennis AE6C
>
>
>
>On Fri, May 11, 2018 at 8:43 AM, J Mcvey via ARC5 <arc5 at mailman.qth.net>
>wrote:
>
>> Why is everyone loathe to use a 4:1 or 9:1 unun autotransformer to match
>> these radios?
>> If your antenna is in the 30 to 90 ohm area, it's a home run every time.
>> These radios were desined for very short antennas and have resistance
>> range of 5 to 12 ohms and can tune against a reactance of zero up to 800
>> ohms or so.
>>
>> The series cap method depends a lot on the cable length and what
>> impedance is being presented due to that length.
>> The shunt variable cap on the output will ( hopefully) produce an L
>> section with the internal inductor that will tune the appropriate range.
>> Of coarse, the other variable with any of this stuff is characteristics of
>> your local antenna...
>>
>> On Friday, May 11, 2018, 10:59:19 AM EDT, DSP3 <jeepp at comcast.net> wrote:
>>
>>
>> Dave,
>>
>> Very good info. I tried them out bhut the one that falls into place for
>> me is using Tap 5. I can't get power out using Tap 4 or 6? The R-24 Q-5er
>> crapped out yesterday but found a bad cap buried in the rear area, the
>> audio primary bypass was bad. That's a new one? Back on the air. I run
>> about 600v and tuned indicating 165ma for 38 watts output. Scope looks
>> quite good. I will archive your data in my ARC-2 manual. Who knows who
>> will need it in 30 years????
>>
>> Jeep - K3HVG
>>
>> On 5/11/2018 7:50 AM, David Stinson wrote:
>>
>> Yesterday, I took a few minutes to test three of
>> the suggested capacitive matching methods which
>> adapt a 50-Ohm non-reactive load to the output
>> of TCS and similar transmitters. The ARC-2 is
>> on the bench and it has an output circuit similar
>> to the TCS, so used that for the test.
>> Can get some time to do this on the TCS
>> if anyone is interested. This wattmeter has not
>> been calibrated in some time, so take these
>> Power readings as relative.
>>
>> ARC-2 Primary 27V. Dynamotor B+
>> All tests at 3890 KC, tuned for max out.
>>
>> 100 pFd capacitor in series to load.
>> 40 W out.
>> 130 mA PA current.
>> ARC-2 Ant Tuning 472
>>
>> 1000 pFd ANT to ground.
>> 40 W out.
>> 145 mA PA current.
>> ARC-2 Ant Tuning 652
>>
>> Capacitive Divider (TCS tuning box)
>> 270 pFd ANT to Load,
>> 1370 pFd, Load to Ground.
>> 44 W out.
>> 190 mA PA Current.
>> ARC-2 Ant Tuning 576
>>
>> "Each to their own," of course.
>> My preference is to trade 10% of power out
>> for a 30% reduction in PA current, which is
>> not only easier on the PA, but makes fully
>> modulating the rig that much easier as well.
>>
>> GL OM ES 73 DE Dave AB5S
>>
>>
>>
>>
>> ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net <ARC5 at mailman.qth.net>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>> ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net
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