Hi all, the Kindle version of my SDR book; "Software Defined Radio: for Amateur Radio Operators and Short Wave Listeners" By Andrew Barron ZL3DW. Is on SALE for four days! The Sale finishes July 31st. Only Kindle and only in the USA and UK. Sorry that's KDP's rules not mine. This is a countdown sale so first in gets the cheapest price. The price rises by $1 per day until it is back to normal pricing.Post is under moderationStream item published successfully. Item will now be visible on your stream.