EMRFD Message Archive 5979

Message	Date	From	Subject
5979	2011-04-01 06:50:46	bty230314	TUF1 and TUF2 Mixers
I am about to build the KK7B Binaural receiver. I have on hand two TUF2 mixers. The circuit calls for TUF1 or SBL1. The spec sheet indicate the TUF2 is for 50-1000MHz Lo/RF, and the TUF1 as 2-600MHz. As my receiver is likely to be 40 or 20 M, does this mean I HAVE to use the TUF1. Aplogies if this is a stupid question. My experience is strictly kit building and I have just started to build from "scratch". and using what is on hand. It is often not clear to me where I can take liberties with a design--hence the question.
5980	2011-04-01 06:57:17	Chris Trask	Re: TUF1 and TUF2 Mixers
> > I am about to build the KK7B Binaural receiver. I have on > hand two TUF2 mixers. The circuit calls for TUF1 or SBL1. > The spec sheet indicate the TUF2 is for 50-1000MHz Lo/RF, > and the TUF1 as 2-600MHz. > As my receiver is likely to be 40 or 20 M, does this mean > I HAVE to use the TUF1. > Yes. > > Aplogies if this is a stupid question. My experience is > strictly kit building and I have just started to build from > "scratch". and using what is on hand. It is often not clear > to me where I can take liberties with a design--hence the > question. > Not stupid at all, just a very basic beginner's question. At least you did your homework and tracked down the specs so you could ask an intelligent question. Chris Trask N7ZWY / WDX3HLB Senior Member IEEE http://www.home.earthlink.net/~christrask/
5981	2011-04-01 08:33:47	peter oesterle	Re: TUF1 and TUF2 Mixers
try a TUF 3 To: emrfd@yahoogroups.com; emrfd@yahoogroups.com From: christrask@earthlink.net Date: Fri, 1 Apr 2011 06:57:16 -0700 Subject: Re: [emrfd] TUF1 and TUF2 Mixers > > I am about to build the KK7B Binaural receiver. I have on > hand two TUF2 mixers. The circuit calls for TUF1 or SBL1. > The spec sheet indicate the TUF2 is for 50-1000MHz Lo/RF, > and the TUF1 as 2-600MHz. > As my receiver is likely to be 40 or 20 M, does this mean > I HAVE to use the TUF1. > Yes. > > Aplogies if this is a stupid question. My experience is > strictly kit building and I have just started to build from > "scratch". and using what is on hand. It is often not clear > to me where I can take liberties with a design--hence the > question. > Not stupid at all, just a very basic beginner's question. At least you did your homework and tracked down the specs so you could ask an intelligent question. Chris Trask N7ZWY / WDX3HLB Senior Member IEEE http://www.home.earthlink.net/~christrask/ [Non-text portions of this message have been removed]
5982	2011-04-01 09:22:46	AD7ZU	Re: TUF1 and TUF2 Mixers
You can roll your own diode ring mixers using FT37-43 toroid cores and 1N4148 diodes. There are some examples in EMRFD and in almost any recent ARRL Handbook. Mini Circuits ADE-1 might also work if you decide to use a factory built mixer. Randy AD7ZU ________________________________
5986	2011-04-01 12:04:58	Tim	Re: TUF1 and TUF2 Mixers
I agree fully with "roll your own" but keep in mind that with 1N4148 diodes, +7 dBm isn't quite the optimal LO drive. It'll work at +7 dBm but more optimal is circa +10dBm or +13dBm. It takes higher drive to reach the plateau, because silicon diodes take a higher voltage to switch than the Schottky/Hot Carrier diodes in commercial mixer modules. A very classic project with a "roll your own" ring mixer is W7EL's "An Optimized QRP Transceiver for 40M".