Listen to Latest SolderSmoke Podcast

Monday, January 26, 2015

New Analog Frequency Readout for BITX17 VXO


I've been getting tired of being in the dark about the frequency on which my BITX17 was operating.  So I pulled out some graph paper, my frequency counter, and a pencil.  You will see two frequencies at each point -- that's because  I use two crystals, switched by the black knob on the left.  I realize this paper and pencil approach is hopelessly out of date, but I see it as "appropriate technology" for a discrete component all-analog transceiver.  

Pete set me straight on how to come up with the numbers: VXO frequency minus  ACTUAL carrier oscillator/BFO freq.  After doing this I took great delight in going on the air and asking guys with fancy "glowing numerals" rigs to compare their freq readout with my pencil and graph paper readouts: they were painfully close.    

But I am not slipping completely into stubborn Luddite-ism; this weekend I worked on a DDS-based AD9850/Arduino VFO with I-Q output based on Paul M0XPD's Kanga-UK Arduino Shield.   STAY TUNED! 

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

No comments:

Post a Comment

Designer: Douglas Bowman | Dimodifikasi oleh Abdul Munir Original Posting Rounders 3 Column