[Drakelist] Roofing filter in R-4A

2011-02-20 Thread Neil M Califano
Where in the schematic would you find a roofing filter? After the first mixer, for example? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] Roofing filter in R-4A

2011-02-20 Thread David
...@zerobeat.net] On Behalf Of Neil M Califano Sent: Sunday, February 20, 2011 2:48 AM To: Drakelist@zerobeat.net Subject: [Drakelist] Roofing filter in R-4A Where in the schematic would you find a roofing filter? After the first mixer, for example

[Drakelist] Roofing filter for R-4A

2011-02-16 Thread Neil M Califano
Does anyone know about this Sherwood filter: SD-5K/8 IF filter? Is it a roofing filter ? Yes, it is a roofing-filter. Bill W6FF What impact does this filter have on the selectivity of an R-4A since the later filters determine the bandwidth and I prefer a wider skirt for AM reception?

Re: [Drakelist] Roofing filter for R-4A

2011-02-16 Thread Al Parker
google is your friend, I think the first hit will tell you much of what you ask. 73, Al On 2/16/2011 6:32 PM, Neil M Califano wrote: Does anyone know about this Sherwood filter: SD-5K/8 IF filter? Is it a roofing filter ? Yes, it is a roofing-filter. Bill W6FF What impact does this