"... probably the up to date inclusions in the Sierra were not available when the K1 was designed 20 years or so ago..."
The Sierra predates the K1. The NE602 mixer and MC1350 IF amp was in common use long before the Sierra was designed and even longer before Elecraft was formed. Elecraft used MC1350 in K2, but chose to substitute it with all AF amplification in K1. When - one day - the K3 and all IcoYaeWoods are irrepairable junk (due to special technology/chips/firmware), you can always rip apart your dead and dusty K1 or K2, throw away the microcontroller and the display, put in a few jumpers on the RF boards, and voila - you have an all analog radio that you can repair from your component junk box and (then) obsolete fleabay ICs. In the exact same way as people do 50+ years old tubes today. " No surprise." Yes, I know. That is why I wonder why the IF amp was changed for an AF amp. Roy RF Tinkerer On Sat, Oct 18, 2014 at 1:12 AM, r j <rjinsp...@gmail.com> wrote: > Hi. > > I have noticed that the K1 and Sierra rcvrs are very similar (as 602 based > designs). The main difference is imo that the Sierra has a MC1350 IF amp > (as has the K2 btw) followed by an LM386, but the K1 seems to do all > amplification after XFIL on AF frequencies using LM386+LM380. > > Could/have the K1 be(en) modified with an IF amp and IF based AGC? > > Thanks. > Roy > RF Tinkerer > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
