C-Heath: Digital Frequency Display for Heathkit SB and HW series.
Now with TCXO reference oscillator for exceptional accuracy and stability. |
Same function as the hard to find SB-650
Plug and Play on some models, minor mods to radios for others. Details on my web site at
http://www.aade.com/applications/heathkit.html
C-Heath display contains power rectifier / filter and regulator. Goes on / off with the radio.
Displays frequency with 10Hz resolution and displays operating mode (LSB, USB, AM and CW)
Fully automatic. It measures the HFO, LMO and BFO frequencies and computes the carrier frequency.
Since it measures all the oscillators it takes into account any errors in the crystals in your radio.
Update rate of 5 times per second tracks real time while you tune.
Digital filtering to eliminate bouncing digits due to digital round off.
ie: does NOT bounce back and forth between 999 and 1000.
Backlit display for low light conditions.
Shown here on top of my SB-303.
Installation consists of connecting three inputs via triple audio/video cable, INCLUDED.
Power can be obtained from the radio's filament voltage.
(Mating power connector for the C-Heath is included)
Other end of triple cable is connected to the jacks intended for the SB-650 display.
All necessary mods to radios applicable to the SB-650 are applicable to the C-Heath and are shown on my web page at