The DDS VFO designed by PU4 WLG. http://troyradio.net/ddsvfo Troy's Radio Service (TX) is the USA distributor for the DDS VFO. For outisde the USA contact PU4 WLG http://kitdds.blogspot.com/ This amazing device gives any CB radio extra frequencies, tuning adjustments, roger beeps, scanning, and more. (NOTE) Troy's Radio Service is extremely busy doing these modifications for customers so you likely will have to wait a bit but the wait is worth it! Works on all types of radios, turns 23 channel radios into 40+ export radios, gives SSB stability to radios with drift issues (Galaxy 959), and can fix radios with bad PLL sections that no longer have replacements available. Cost is currently $75 for the kit and $150 if you have Troy's install it.