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Progrock2 and an old scanner

 

I was given an old Realistic Pro-52 8 channel lo-vhf crystal controlled scanner. It was very popular in the 70s as a clone of Bearcat.?
I programmed a progrock2 to the NOAA local vhf station, put the output to the hot side of a crystal socket and voila.?
I direct coupled in so adding a ground overloaded the scanner oscillator now amplifier- so next try is a .01 uF in series to knock things down a bit. The single lead with a ground floating seemed fine.?
I powered the progrock2 with a USB power bank and that kept the progrock2 floating with respect to the scanner ground.?
It also seemed to be a bit more sensitive than the crystal that corresponded to NOAA included in the scanner.?
Square vs Sine output did not seem to matter.?
Now on to APRS- maybe I can receive data with this old thing.?

Larry
KB3CUF
 

The square wave actually is better. The original crystal spec is (desired freq)-10.7 (IF) /3 (third overtone)

Square wave means that there is usable energy at the harmonic.?

Larry
KB3CUF?

On Mon, Aug 19, 2024 at 4:10?PM Larry Acklin via <acklin=[email protected]> wrote:
I was given an old Realistic Pro-52 8 channel lo-vhf crystal controlled scanner. It was very popular in the 70s as a clone of Bearcat.?
I programmed a progrock2 to the NOAA local vhf station, put the output to the hot side of a crystal socket and voila.?
I direct coupled in so adding a ground overloaded the scanner oscillator now amplifier- so next try is a .01 uF in series to knock things down a bit. The single lead with a ground floating seemed fine.?
I powered the progrock2 with a USB power bank and that kept the progrock2 floating with respect to the scanner ground.?
It also seemed to be a bit more sensitive than the crystal that corresponded to NOAA included in the scanner.?
Square vs Sine output did not seem to matter.?
Now on to APRS- maybe I can receive data with this old thing.?

Larry
KB3CUF

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