Speaking of Bob Gunderson and his BTP, does anyone happen to have any of
those old magazines? I'd sure like to borrow or buy them. Either Braille
or recorded. I had several years of them which I lost in one of my recent
moves. Watsa someone, please?
Tnx.
73, The other Howard, WA9RYF
----- Original Message -----
From: "Ed Malmgren" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, September 11, 2011 2:42 PM
Subject: Fw: For the other certifiable Old Timers Among Us
> Mike, I am one of which you mentioned, and O T. I am still using one of
> those circuits from The B T P andam using it for antenna direction across
> the rotor meter. I think I built it in about 61. Dam, I'm getting old
> hi.
> 73
> Ed K7UC
>
> --------------------------------------------------
> From: "Mike Duke, K5XU" <[log in to unmask]>
> Sent: Sunday, September 11, 2011 12:05 PM
> To: <[log in to unmask]>
> Subject: For the other certifiable Old Timers Among Us
>
>> For those list members who read Bob Gunderson's Braille Technical
>> Press, do you remember the advertisement for Grand Central Industries?
>>
>> One of the items this company sold was a brand of solid state gadgets
>> such as very low power audio amplifiers, AM broadcast band part 15
>> transmitters, etc. The manufacturer was Round Hill Industries.
>>
>> This was long before single chip circuits. These devices were
>> assembled from individual components, and then fully sealed in epoxy,
>> with bare wires protruding from the edges for connection to the power
>> sourse, speakers, etc.
>>
>> They were literally the size of an ice cube, which for the late
>> 1960's, was indeed minuscule. While I never confirmed it other than by
>> hearsay, someone told me that the company did in fact use ice trays as
>> the mold for the sealed units.
>>
>> One of the gadgets this company made was a "CW Monitor." The purpose
>> of this monitor was to provide the side tone which we now take for
>> granted, but which did not come with most rigs of the day, and was an
>> add on option for only a few transceivers.
>> You connected two wires to a small speaker, two others to a single D
>> cell, and another to a few feet of hook up wire, which served as the
>> antenna.
>>
>> Then, when you transmitted CW, the thing would squawk, thus giving you
>> a means of monitoring what you were sending.
>>
>> Yesterday, I discovered a box of odds and ends left from the equipment
>> of my late friend, K5ZFM.
>>
>> In the bottom of that box was one of the Round Hill CW Monitor
>> modules, still attached to an old portable radio speaker and battery
>> holder. I will clean it up and try it out later this week.
>>
>> The one that I bought on his advice as a Novice in 1969 gave up the
>> ghost many years ago.
>>
>>
>>
>>
>>
>>
>>
>>
>> Mike Duke, K5XU
>> American Council of Blind Radio Amateurs
|
