[ARC5] Using SCR-274N

[Kenneth G. Gordon]

On 29 Mar 2013 at 16:30, Geoff wrote:

> I dont like audio filters altho many do.

To me, whether an audio filter is worthwhile or not depends on both the filter 
and the rig you want to use it with: I have found that the CWF-2 (sold for a 
while by MFJ, and now available as a kit from Vectronics as their VEC-820K) 
audio filter makes an excellent addition to a Heathkit HW-16.

It contains 4 cascaded ICs and has 180 Hz, 110 Hz, and 85 Hz outputs 
supplied, and 90 Hz is available if you want to add one wire.

It also provides about 3 db audio gain.

Center frequency is 750 Hz.

Runs on anything from 5 to 15 VDC.

Although you can plug it into your phone jack and then plug your phones into 
it, I installed one after the detector and before the 1st audio stage in the 
HW-16.

It makes a big difference when it is needed. If I have occasion to use it, I use 
the 90 Hz position most of the time. To me, the 85 Hz position is a bit too 
narrow.

Most of the time I leave it switched out.

Ken W7EKB