4826	2010-07-27 05:59:58	Tom	Steve Weber Butterfly DDS VFO
Message	Date	From	Subject
In an effort to learn AVR assembly language programming for the Kits and Parts DDS Development Kit I bought a book, Programming Microcontrollers using Assembly Language by Chuck Baird. The book uses an AVR Butterfly as a tool for learning. Steve Weber, KD1JV also used the same platform to come up with a controller for the DDS-60. Having a spare DDS-60 I figured that I would give Steve's project a try. The source code for the Butterfly DDS and additionalinformation is at http://kd1jv.qrpradio.com/page4.html. The finished VFO uses the Butterfly DDS with a NJQRP DDS-60. I also used a MMIC RF T/R switch that Pete Juliano, N6QW, introduced me to. The Hittite HMC 544 is mounted on a SparkFun SOT23 to DIP Adapter (part# BOB-00717) and switches the rf output of the DDS-60 between the transmit and receive bnc connectors using the cmos logic mentioned on the HMC544 data sheet. http://www.hittite.com/content/documents/data_sheet/hmc544.pdf The cmos is triggered with the T/R pin of the Butterfly board. I did a YouTube video that can be found here. http://www.youtube.com/watch?v=mrDYEbRGEds The video is somewhat related to this group in that I also use the HYCAS AGC/IF amplifier and a 30 year old 9MHz BFO from the Progressive Receiver to test the vfo :). Tom, ak2b http://www.kitsandparts.com/DDS-Dev-Kit.php
4836	2010-07-29 07:53:50	Nick Kennedy	Re: Steve Weber Butterfly DDS VFO
Tom, where did you purchase the Hittite HMC544? Did you have to get it from the manufacturer? I don't get any hits in Digikey or Mouser. 73- Nick, WA5BDU
4837	2010-07-29 11:47:38	Dave - WB6DHW	Re: Steve Weber Butterfly DDS VFO
Nick: You can order them from the Hittite website. Dave - WB6DHW <http://wb6dhw.com> Nick Kennedy wrote: > Tom, where did you purchase the Hittite HMC544? Did you have to get it from > the manufacturer? I don't get any hits in Digikey or Mouser. > > 73- > > Nick, WA5BDU > >
4839	2010-07-30 06:23:34	Tom	Re: Steve Weber Butterfly DDS VFO
Hi Nick, I got them here http://www.hittite.com/products/view.html/view/HMC544 as Dave has already pointed out. They are about 1.50 each. The first two I got were samples and I just ordered ten more. Dave also uses them in his UHFSDR http://wb6dhw.com/UHF-SDR/pre-production/UHF_SDR-sch.pdf Tom, ak2b
4840	2010-07-30 09:38:15	Nick Kennedy	Re: Steve Weber Butterfly DDS VFO
Thanks. Good deal that you can buy in small quantities direct since I didn't find them at Mouser or Digikey. I wonder if they're good for 5 watts "CCAS". The spec sheet doesn't mention power but specifies a +39 dBm 1dB compression point. But in the sales area they title it a "2 watt" T/R switch. They do have a "10-watt T/R switch" for DC to GHz but it's over six bucks. Hittite ... aren't they the guys who invented the iron sword? 73- Nick, WA5BDU
4841	2010-07-30 11:04:20	Lasse	Re: Steve Weber Butterfly DDS VFO
Check the performance at low frequencies... might not do well with low f and high power! The 10W switch looks nice... even if it cost 5 bucks more! /Lasse SM5GLC Nick Kennedy skrev 2010-07-30 18:38: > Thanks. Good deal that you can buy in small quantities direct since I > didn't find them at Mouser or Digikey. > > I wonder if they're good for 5 watts "CCAS". The spec sheet doesn't mention > power but specifies a +39 dBm 1dB compression point. But in the sales area > they title it a "2 watt" T/R switch. They do have a "10-watt T/R switch" > for DC to GHz but it's over six bucks. > > Hittite ... aren't they the guys who invented the iron sword? > > 73- > > Nick, WA5BDU > > >
4842	2010-07-30 11:57:41	ajparent1	Re: Steve Weber Butterfly DDS VFO