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Total: 9 results found.

... ROM replacement on a stock 16K Model 1.   The small board adds 32K RAM (bringing the total Model 1 RAM to 48K), an optional EPROM mapped to the empty address block at 0x3000 (for hackers ...
A few years back I built a QRSS transmitter (for slow morse and WSPR) based on a recycled DLink DSL-502T router running OpenWRT and connected to an Si570 DDS module. (http://www.quicktrip.co.nz/jaqblog/home/44-si570qrss) ...
... in the Z80 socket is used.  The shim provides access to the required Z80 signals but also adds buffering to the address, data and IO control lines. Does that mean the Kaypro used the same pin ...
After changing from using the Yaesu FT-817 protocol I picked the ICOM IC-725 as a reference having never seen one.  It seemed fairly representative of the use case for the DDS module as a generic ...
... protocol so the DDS module can be used in a rig and powered by Ham Radio Deluxe. I started by trying to implement the Yaesu FT-817 CAT protocol.  It seemed fairly simple and didn't require a ...
Test board for the cheap eBay DDS modules. The board is based on a design by WB2V with software enhancements by AA0ED and AA0ZZ. The cheap AD9850 DDS modules currently available on eBay are ...
The cheap AD9850 DDS modules currently available on eBay are a great starting point for a signal generator project but are a little short on documentation. The pinout and relationship to ...
8. Codan N3ZI DDS
(JAQ/BLOG)
Another project in progress.... installing an N3ZI DDS2 into a Codan 6801 Marine transceiver. The N3ZI works well as a crystal replacement and requires no buffer amplifier in ...
9. SI570 QRSS Beacon
(JAQ/BLOG)
My MEPT QRSS and WSPR beacon is controlled by a DLink DSL-502T running OpenWRT. The QRSS and WSPR messages are generated by directly controlling the frequency of an Si570 chip.  The interface ...

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Contact Andrew Quinn

jaquinn@ihug.co.nz http://twitter.com/jaquinn