[ARC5] Receiver Filter Adaptor Simple ARC 5 xtal receiver?

[Kenneth G. Gordon]

On 16 Feb 2016 at 11:54, Dennis Monticelli wrote:

> I looked into a XTAL filter for the ARC-5.  It will work for the high IF
> versions but not the low freq IFs due to high crystal resistance.  For example
> an 85KHz crystal Rs would be 50 to 100K.  By contrast a 2MHz rock would exhibit
> around 200 ohms.

Well, in my opinion, receivers with the 85 kHz IF don't need a crystal filter 
anyway.

The 6 - 9.1 MHz receivers most certainly do need considerable "help" in the 
selectivity department, if we would like to use them for CW operations on a 
ham band. 

The 3 - 6 MHz receivers could use such help sometimes, but those are 
certainly usable most of the time when used as-is. At least I've been able to 
use them for casual work.

But, again IMHO, those receivers with even lower IFs don't really need it at 
all.

Still, YMMV...

Ken W7EKB