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Details about  K7DYY Class D AM Ham Radio Transmitter in Excellent condition. 150 watts Carrier

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K7DYY Class D AM Ham Radio Transmitter in Excellent condition. 150 watts Carrier
Item Ended
Item condition:
Aug 14, 2012 05:54:28 PDT
Current bid:
US $202.50
8 bids ]
$12.80 Standard Shipping | See details
Item location:
Davenport, Iowa, United States


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  Aug 04, 2012 09:05:46 PDT  View all revisions

Item specifics

Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully ... Read moreabout the condition


Supported Modes:




Frequency Band(s):


For Sale: Factory Built K7DYY Junior 150 watt carrier class D AM transmitter. It comes with a 3.885 Crystal. It gets around 450 watts PEP out put. It comes with a very old Astatic D 104 microphone ( metal Logo)  with one of Bruce's audio boards installed.

This little transmitter works just fine. All you need is a antenna with a 1:5 to 1 or less SWR. Do not use with higher SWR readings.

I had it pared it up with a little Palstar R30 receiver. This combo makes a very compact high power AM station. Of course you can use any AM receiver of you're choice.

It includes a relay to switch the antenna from the receiver and this transmitter. A normally open RCA cable is installed in the relay box to mute you're receiver. K7DYY no longer makes this transmitter. His new Super Senior costs $1,400.00 . If you want to change frequency just plug in a different FT-242 crystal.

It is being sold as-is with no returns, but again it works just fine and I always get great signal reports with it. 

If you have any questions about this transmitter please feel free to ask before you bid on it.

I prefer to use Fedex for shipping, but I will use a shipper of you're choice. Note: The on-line calculator is for UPS. Fedex may be slightly different.

Payment must be sent with-in 4 days.

If you don't have Paypal contact me for other payment options


Check K7DYY's Web-Site for more information on his transmitter

 Bruce was the guy who manufactured the Index Lab QRP Transceiver years ago.

The audio processor uses high gain, high impedance circuitry. It must be mounted in a shielded enclosure to avoid hum pickup.

  • The mounting holes in the PCB are spaced to fit the base of Astatic D-104 microphones.
  • Alternately the processor can be mounted in a 2" X 4" die cast aluminum box.

The processor requires 8 to 15 volts DC at 20 mA. This is supplied by the class D transmitter or a battery can be used. The supply is connected between terminals +V and G on the PCB.

The audio output is designed to drive a load impedance of 600 ohms or higher. It can be plugged directly into the microphone input of most transmitters and even modern transceivers.

The input is high impedance (6.8 megohm) and can be connected directly to crystal or ceramic elements. The schematic diagram shows how to adapt the unit for use with electret elements.

If using the processor with a vintage transmitter, it is best to leave the transmitters mic gain control at it's normal setting and adjust the mod level control, in the base of the microphone, for full modulation. This will make A/B comparisons easier.

The Processor Board mounts in an Astatic D-104. The processor matches the D-104 and drives the Senior directly. Power is supplied by the Senior.

This board sells for  $50 



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