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Author Topic: "A Three-Transistor Receiver for the Beginner" ARRL 1968 -- Build  (Read 107151 times)

G3EDM

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RE: "A Three-Transistor Receiver for the Beginner" ARRL 1968 -- Build
« Reply #60 on: October 05, 2014, 11:08:19 AM »

A good morning's work. As part of the preparations for finally going on the air, and to enable the receiver to interconnect properly with the transmitter through the external homebrew transmit/receive switch that is under construction, I made three improvements:

(1) Addition of a reed relay for fully muting the RF stage during transmit, while still allowing monitoring of the transmitter's sidetone generator through the receiver's headphones or speakers. I added this feature because shorting the receiver's antenna input during transmit wasn't enough; the transmitter's RF was getting through and overloading the receiver, drowning the sidetone. This type of overloading is typical of regenerative receivers.

(2) Addition of an SO-239 antenna connector, to facilitate connection to the future external T/R switch.

(3) Addition of an on-off switch for the speaker amp stage, to allow easy choice of speaker, headphones or both.

While I was about it, I replaced the temporary back panel with a shiny new one....

At this point the receiver is "QSO-ready"!

Chaper Eleven, "Adding a T/R Relay, Antenna Connector and Speaker Switch," is here: http://tinyurl.com/nnwro8h.

73 de Martin, KB1WSY
« Last Edit: October 05, 2014, 11:11:54 AM by KB1WSY »
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G3EDM

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RE: "A Three-Transistor Receiver for the Beginner" ARRL 1968 -- Build
« Reply #61 on: January 19, 2015, 06:43:45 PM »

My complete vintage homebrew station: the receiver described in this thread, and the transmitter (http://www.eham.net/ehamforum/smf/index.php/topic,97719.0.html) were displayed at the Boston Amateur Radio Club (http://www.barc.org/) monthly meeting last week for the annual "show and tell." It was a lot of fun; my offering was the only one that wasn't "screaming brand new and digital" and the contrast was great. The other offerings were intriguing too.

Unfortunately this meeting of the BARC was the only ham-related activity I've managed to do in the past couple of months. Life and Work are just too overwhelming for the moment.

73 de Martin, KB1WSY
« Last Edit: January 19, 2015, 06:48:18 PM by KB1WSY »
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