[CW] Mackay 3010B tube receiver

[Richard Knoppow]

    There were filters made for Collins gear by other companies. 
I wonder if the 100Khz filter was one of them. Some were crystal 
or ceramic lattice filters. Ceramic filters were hot stuff at one 
time. 100Hz, even with just a conventional crystal filter is too 
narrow. The conventional ones ring. I think around 200Hz is about 
the minimum. One advantage of conventional crystal filters is the 
rejection notch. Not as good as a dedicated notch filter as in 
the Drake R4B but often better than just a narrow filter. If the 
skirts of the filter are really steep, as in a lattice filter, 
its possible to push an interfering signal off the edge of the 
passband but a good notch filter is still better IMO and can be 
used with wider pass bands for phone. I am sure you know all this.
     I wonder if the selector on the 3010 is a band pass or band 
stop filter. Somewhere someone must have some technical 
literature about it.
    I think I know which one the 2018 receiver is but couldn't 
find an instruction book for  it in my files.
On 9/16/2019 3:52 AM, D.J.J. Ring, Jr. wrote:
> 
> Mine had  a 100 Hz mechanical filter in a narrow tube..  Ir was 
> extremely sharp in the narrow bandwidth position.  There were 6 
> kHz 3 kHz and 100 Hz filters.  The added black area seems to be a 
> filtering system, it seems to say "Aux Range" and seems to select 
> frequencies below the MW broadcast band only.   It doesn't have 
> the MW 600 to 1700 kHz band reject filter switch like the one I 
> used had.
> 
> The best receiver I've ever used on MF, with the exception of the 
> little regenerative 2018 model receiver which was really 
> sensitive, no AGC at all, but it was great for sea watches, you 
> could hear coast stations 1000 miles away during daytime.
> 
> 73
> DR


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL