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Technical Topics => The RF Workbench => Topic started by: ChrisSmolinski on November 14, 2013, 1650 UTC

Title: Cypress CY22150 Programmable frequency generator
Post by: ChrisSmolinski on November 14, 2013, 1650 UTC: Woohoo! my first transmitter related post. I got tired of hunting for crystals at hamfests. This isn't 1960, there must be a better way to control a transmitter's frequency. Turns out, there is:

http://hfunderground.com/blog/?p=215 (http://hfunderground.com/blog/?p=215)
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: moof on November 14, 2013, 2019 UTC: KRONK NO LIKE SMD OR WRITE CODE! KRONK PLUG CRYSTAL IN HOLES!
I was lost a quarter of the way in. You can watch the auction sites and buy them a box at a time for 50 cents to a buck apiece. I'm not quite a crystal hoarder. Yet.
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: redhat on November 15, 2013, 1024 UTC: We do live in the modern age of programmable oscillators. Digikey can program these for free in single quantities for about $8. http://www.digikey.com/product-detail/en/CPPC4-HT5RT/CPPC4-HT5RT-ND/387814 (http://www.digikey.com/product-detail/en/CPPC4-HT5RT/CPPC4-HT5RT-ND/387814) Use a 74LS04 or something similar and it will direct drive a mosfet in say a grenade. Phase noise specs aren't great, but few people will be doing stereo or DRM with them.

+-RH
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: ff on November 15, 2013, 1512 UTC: Quote from: ChrisSmolinski on November 14, 2013, 1650 UTC
Woohoo! my first transmitter related post.

Congratulations! An excellent post, Chris - lots of food for thought here. Unfortunately I'm kinda like moof these days. My aging brain just does NOT like to learn new tech. However, if you get something going with a PIC, I'd be quite interested. I used to do MPASM a dozen or so years ago and could probably still stumble through it. Thanks for the post!
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: redhat on November 23, 2013, 0401 UTC: Or if you like, you can always grind your own.

http://www.youtube.com/watch?v=j7CS4A8wB1E (http://www.youtube.com/watch?v=j7CS4A8wB1E)

+-RH
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: thechoat on November 26, 2013, 0008 UTC: Ill take two Chris but youll have to program them lol.
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: ChrisSmolinski on November 26, 2013, 0030 UTC: Quote from: thechoat on November 26, 2013, 0008 UTC
Ill take two Chris but youll have to program them lol.

You could send the config commands via two pins on a parallel port. Do PCs still have those?

If I get the chance I want to put together a little PIC microcontroller code to configure frequency. As always, the issue is lack of time...
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: cmradio on November 26, 2013, 0953 UTC: No, this isn't 1960, but at least one doesn't have to be a goddamn computer scientist to plug in a crystal! :D

Peace!
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: Kilokat7 on November 26, 2013, 1427 UTC: Real crystals glow in the dark!

(http://amdxer.com/misc/vacuum_tube_crystal.jpg)
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: thechoat on November 27, 2013, 0400 UTC: Ooooooooo purdy...... :-*
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: redhat on November 27, 2013, 0732 UTC: Remember when they looked like this?

+-RH
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: cmradio on November 27, 2013, 0849 UTC: Quote from: redhat on November 27, 2013, 0732 UTC
Remember when they looked like this?

Yes, actually ;D

Got a 100KHz calibrator xtal in a bottle.

Peace!
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: refmo on November 27, 2013, 1256 UTC: yes, cmradio - calibration crystal is the only crystal in a bottle that I recall having also, but I don't recall which radio had it, maybe Hallicrafters SX-100 [?].
Title: Re: Cypress CY22150 Programmable frequency generator
Post by: cmradio on November 28, 2013, 0715 UTC: I don't know, Refmo... my crystal was inherited from a late dear friend. He was a communication technician.

Peace!