[MRCA] MRCA Digest, Vol 154, Issue 8

Thu Feb 9 17:23:24 EST 2017

Fantastic code practice, Dean! You were (as expected) 20+ over across 
town. My copy was pretty rough. I guess I don't hand write enough these 
days because my hand cramped up about midway. Otherwise pretty good copy 
here. Copying groups is definitely more challenging that conversational 
(QSO) text! I can usually cruise along at 20 by ear but this was tough!

Best 73 de Bob W1ICW

On 2/9/2017 4:18 PM, mrca-request at mailman.qth.net wrote:
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> Today's Topics:
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>     1. MRCA Agent Code Practice (Radio Station KW1I)
>     2. Re: MRCA Agent Code Practice (w8au at sssnet.com)
>     3. Re: MRCA Agent Code Practice (comcast)
>     4. Re: [BoatAnchors] Smart People:  BC-9 TX/RX Freq Shift- Q?
>        (Katsuhiko Hirai)
>     5. KWM-2 Ops with QF-1 (B. Smith)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 8 Feb 2017 23:17:32 -0500
> From: "Radio Station KW1I" <kw1i at earthlink.net>
> To: <mrca at mailman.qth.net>
> Subject: [MRCA] MRCA Agent Code Practice
> Message-ID: <B6CEFB1CC29447719CD3E1AD7316C945 at HomeOffice>
> Content-Type: text/plain; charset="iso-8859-1"
>
> To:  MRCA Clandestine Agents
>
> Tomorrow evening, February 9, 2017 at 1710 EST and 2140 EST in the vicinity of 3570 kHz there will be a short agent message transmission. 53 five letter groups will contain a plain text message beginning and ending with a group made up of five "V" characters. The message will be sent twice. The message will be preceded by QST QST QST MRCA Code Practice DE KW1I sent three times. The CW is machine generated and is less than 10 WPM. The total transmission time is ten minutes. The signal should be able to be heard in most of the Northeast. This is an opportunity to go through the motions of receiving a clandestine message sent to agents by an espionage communications center. If it is a little faster than your code speed, record it and play it back several times so you can decode it all.  After receiving the message reassemble the message from the groups. If conditions are good, try receiving the message on a small agent set with a compromise antenna.
>
> Feedback on this exercise is invited. All responses should be emailed to the MRCA Reflector which is constantly monitored by the MRCA Clandestine Communications Center.
>
> Notice of additional broadcast of this message and follow-on messages will also be via the MRCA Reflector.
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> ------------------------------
>
> Message: 2
> Date: Thu, 09 Feb 2017 02:55:41 -0500
> From: w8au at sssnet.com
> To: "Radio Station KW1I" <kw1i at earthlink.net>,<mrca at mailman.qth.net>
> Subject: Re: [MRCA] MRCA Agent Code Practice
> Message-ID: <mailman.24540.1486675121.7384.mrca at mailman.qth.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> Dale:  Hope it doesn't appear too much like "codes and ciphers" or
> anything disguised
> which are not allowed in ham radio.  ;-)
>
> Perry    w8au
>
>
>
> At 11:17 PM 2/8/2017, Radio Station KW1I wrote:
>
>> To:  MRCA Clandestine Agents
>>
>> Tomorrow evening, February 9, 2017 at 1710 EST and 2140 EST in the
>> vicinity of 3570 kHz there will be a short agent message
>> transmission. 53 five letter groups will contain a plain text
>> message beginning and ending with a group made up of five "V"
>> characters. The message will be sent twice. The message will be
>> preceded by QST QST QST MRCA Code Practice DE KW1I sent three times.
>> The CW is machine generated and is less than 10 WPM. The total
>> transmission time is ten minutes. The signal should be able to be
>> heard in most of the Northeast. This is an opportunity to go through
>> the motions of receiving a clandestine message sent to agents by an
>> espionage communications center. If it is a little faster than your
>> code speed, record it and play it back several times so you can
>> decode it all.  After receiving the message reassemble the message
> >from the groups. If conditions are good, try receiving the message
>> on a small agent set with a compromise antenna.
>>
>> Feedback on this exercise is invited. All responses should be
>> emailed to the MRCA Reflector which is constantly monitored by the
>> MRCA Clandestine Communications Center.
>>
>> Notice of additional broadcast of this message and follow-on
>> messages will also be via the MRCA Reflector.
>> ______________________________________________________________
>> MRCA mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/mrca
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>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 9 Feb 2017 07:59:19 -0500
> From: comcast <kg2bz at comcast.net>
> To: w8au at sssnet.com
> Cc: Radio Station KW1I <kw1i at earthlink.net>, mrca at mailman.qth.net
> Subject: Re: [MRCA] MRCA Agent Code Practice
> Message-ID: <BB4BC2FD-CECB-4105-8EA4-9BFE99B47949 at comcast.net>
> Content-Type: text/plain;	charset=us-ascii
>
> code practice is allowed per fcc regs
>
> Sent from my iPhone
>
>> On Feb 9, 2017, at 2:55 AM, w8au at sssnet.com wrote:
>>
>> Dale:  Hope it doesn't appear too much like "codes and ciphers" or anything disguised
>> which are not allowed in ham radio.  ;-)
>>
>> Perry    w8au
>>
>>
>>
>> At 11:17 PM 2/8/2017, Radio Station KW1I wrote:
>>
>>> To:  MRCA Clandestine Agents
>>>
>>> Tomorrow evening, February 9, 2017 at 1710 EST and 2140 EST in the vicinity of 3570 kHz there will be a short agent message transmission. 53 five letter groups will contain a plain text message beginning and ending with a group made up of five "V" characters. The message will be sent twice. The message will be preceded by QST QST QST MRCA Code Practice DE KW1I sent three times. The CW is machine generated and is less than 10 WPM. The total transmission time is ten minutes. The signal should be able to be heard in most of the Northeast. This is an opportunity to go through the motions of receiving a clandestine message sent to agents by an espionage communications center. If it is a little faster than your code speed, record it and play it back several times so you can decode it all.  After receiving the message reassemble the message from the groups. If conditions are good, try receiving the message on a small agent set with a compromise antenna.
>>>
>>> Feedback on this exercise is invited. All responses should be emailed to the MRCA Reflector which is constantly monitored by the MRCA Clandestine Communications Center.
>>>
>>> Notice of additional broadcast of this message and follow-on messages will also be via the MRCA Reflector.
>>> ______________________________________________________________
>>> MRCA mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/mrca
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:MRCA at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> MRCA mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/mrca
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:MRCA at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 10 Feb 2017 03:50:08 +0900
> From: Katsuhiko Hirai <mxc04040 at nifty.ne.jp>
> To: "David Stinson" <arc5 at ix.netcom.com>
> Cc: <milsurplus at mailman.qth.net>, <mrca at mailman.qth.net>,
> 	<boatanchors at mailman.qth.net>, <boatanchors at theporch.com>
> Subject: Re: [MRCA] [BoatAnchors] Smart People:  BC-9 TX/RX Freq
> 	Shift- Q?
> Message-ID: <20170210035008.C1B4.4E50566 at nifty.ne.jp>
> Content-Type: text/plain; charset="ISO-2022-JP"
>
> Dear Dave, AB5S
>
>    Good morning.
> I appreciated your kind note.
> I found one example of the audio frequency transformer into the article
> as follows:
>
> Issue: AUG 1925 - QST (PG. 16)
> Title: The DeForest D-17 Receiver   which includes two A.F.T.
> Author: Livingstone, Edward A.
> Article: QST Archive [PDF]
>
> Copied sentences:
> " First A.F. Transformer--(11)-- Ratio;5:1. DeForest type A-50. Turns:
>   Primary 2800 of No.38 wire. Secondary 14,000 of No.40 wire. D.C. Resistance:
>   Primary 540 ohms; secondary 7370 ohms. Impedance: Primary 60,000 ohms; second-
>   ary 1,500,000 ohms. Inductance at 1000 cycles: Primary 9 henries; secondary
>   250 henries.
>    Second A.F. Transformer--(12)-- Ratio: 3.5:1. De Forest type A-35. Turns: Pri-
>   mary 2800 of No.38 wire. Secondary 9800 No. 40 wire. D.C. Resistance: Primary
>   540 ohms; secondary 5160 ohms. Impedance: Primary 55,000 ohms. secondary
>   680,000 ohms. Inductance at 1000 cycles: Primary 8.5 henries; secondary 102
>   henries. In both cases the closed core is of laminated silicon transformer
>   steel 5/8 inch square and is sufficiently large to permit maximum amplifica-
>   tion without distortion over all frequencies. "
>
> I'm happy if these notes were helpful for you, although you might know it well.
>
> Have a nice new day for you,
> Best regards,
> Katsuhiko Hirai, JA3ECA
>
>
> On Wed, 8 Feb 2017 06:28:04 -0600
> "David Stinson" <arc5 at ix.netcom.com> san wrote:
>
>> P.S.  I'm sorry, I do not know the turns ratio of the interstage transformers.  Perhaps members who are more familiar with these very early audio amplifiers will have some insight.
>> 73 Dave S.

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