[Elecraft] Re: Ham bands vs GC receive

[wayne burdick]

Hi Bill,

> I'm still not clear on the general-coverage receive option -- if it is 
> indeed "optional" or available by default in a minimally configured 
> radio.

The basic radio, as well as the subreceiver, have a full array of 
ham-band-only filters at the front end. This is to ensure excellent 
performance in the ham bands. These filters are switched in by means of 
relays.

The KBPF3 option is a small plug-in module that sits above the ham-band 
filters. It, too, has a number of filters switched in by relays. The 
difference is that these are wider filters, covering all of the area 
between the ham bands. But they share the same input/output path as the 
ham-band filters. When not selected, the GC filters have absolutely no 
effect on performance, thanks to a very careful layout that minimizes 
trace lengths.

When you tune the radio well outside the ham bands, an appropriate GC 
filter is automatically selected by firmware.

> Is this the only filter installable for GC receive?

Yes, at present. You can install the KBPF3 on the main receiver or sub 
receiver or both.

However, the K3 has that "modularity" thing we've been talking about, 
so in theory we could design a different band-pass filter set for 
special applications.

73,
Wayne
N6KR


---

http://www.elecraft.com