EMRFD Message Archive 7242

Message	Date	From	Subject
7242	2012-02-12 21:56:01	Ashhar Farhan	to cool device
finally, doug has kitted an RF attenuator. http://qrpkits.com/attenuator.html now, why didn't anyone think of this kit earlier? - farhan
7248	2012-02-13 14:19:42	WA0ITP	Re: to cool device
Here's some that have been around for awhile http://midnightscience.com/kits.html#kit4E ------------------------------------------------------------------- Back to the bench, Winter's too valuable to waste. I love this radio stuff ! 72, 73 Terry, WAØITP wa0itp@wa0itp.com www.wa0itp.com www.4sqrp.com www.qrpspots.com ----- Original Message -----
7252	2012-02-14 19:03:37	Donald Kelly	Re: to cool device
Hi All, There is no isolation between any of the PI sections in the kits mentioned. I would expect that could be an issue in some extreme cases. I would want to minimize/eliminate the chance of bleed through when a precise measurement is taken. Maybe I am too picky. My HB step attenuator is based on the project in the 1990 ARRL Handbook. I don't think I have $10 in the junk box project. I put a copy in my homebrew signal generator with good results. 73, K5UOS [Non-text portions of this message have been removed]
7253	2012-02-15 13:33:47	Kerry	Re: to cool device
I agree; inter-stage shielding would give better performance. I've been working on a step attenuator; it is at this stage at present; http://i43.tinypic.com/24y69w3.jpg The resistors will be 0805 and 0603 and the switches will be "surface-mounted" as NA5N did it. It will look much better when it's finished. :)