Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Another perhaps not so significant problem with a narrower 1st IF filter is the effect it has on the Noise Blanker, if used. Any filter delays signals through it a specific amount, generally the narrower the filter, the longer the delay. It will also "stretch" signals passing through it, i.e., a noise "spike" is actually made somewhat "wider" as it goes through a filter. The narrower the filter, the more the signal is stretched. These two factors can either degrade, or render useless, the Noise Blanker operation, depending upon the filter bandwidth. If you don't have/use the Noise Blanker it's a non-factor.
73, Garey - K4OAH Atlanta
Drake C-Line Service Manual <http://hr99.home.mindspring.com/R-4C_Servicez/>
Graf Ulrich Com MD PD ST 2 ULM 1 wrote:
Hello Eric,
the filter on the first if is centered, that means that both sidebands have to pass through. With a bandwidth of 4 kHz only your maximum audio frequency on either sideband is limited to 2 kHz - much too low for acceptable ssb reception. For pleasant ssb a minimum bandwidth of the roofing filter of about 6 kHz is required.
73 Uli, DK4SX
-----Ursprüngliche Nachricht----- *Von:* [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] *Im Auftrag von *Eric Webner *Gesendet:* Sonntag, 15. Mai 2005 04:52 *An:* drakelist@www.zerobeat.net *Betreff:* Re: [drakelist] R-4C filters
Hi there,
My two cents worth: if SSB sounds great with a 2.1 kHz filter in
the second IF (and it does!), then a 1st IF filter that is just as
tight would be fine, also. Personally, I would like a 4 kHz
filter. It would be too small a bandwidth for AM, but my interest
is mostly SSB and CW. The idea here is to keep out strong adjacent
signals so that the rest of the radio doesn't overload.
One of Sherwood Engineering's mods that I like is the one with the
filters and relays so that not only are different filters switched
in/out for the second IF, but also for the 1st IF.
I should qualify this by saying that I don't have these mods in my
R-4C, but I am sure dreaming about it!!!
73,
Eric KA8FAN
*/Jim W7RY <[EMAIL PROTECTED]>/* wrote:
Jim W7RY made an utterance to the drakelist gang ---------------------------------------------------------------------- I would take a look at the Sherwood engineering site. http://www.sherweng.com/filters.htm#drake-r4c They specialize in Drake filters and modification kits. I have EVERY Sherwood Engineering modification installed in my R4C.
73 Jim W7RY
At 06:35 PM 5/14/2005, n7ioh wrote:
>n7ioh made an utterance to the drakelist gang >---------------------------------------------------------------------- > I am looking at buying some filters to improve my R-4C late serial > number. From what I have read the first thing I should do is to replace > the stock 1st IF filter with the Inrad 8kc 8 pole filter. I notice that > they also offer a 6kc filter. ! I would assume that the 6kc filter would > not be a good choice SSB and AM use, am I wrong here? Second I am > looking at buying the Inrad 2nd IF 6kc AM filter and MAYBE their 2.1kc > SSB filter. I don't operate CW so that is not a concern and I already > have one CW filter. I would like to hear from those who have used these > filters and get some feedback. > Thanks, Al, N7IOH >---------------------------------------------------------------------- >On Behalf of n7ioh >Submissions: drakelist@www.zerobeat.net >Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body >Hopelessly Lost: [EMAIL PROTECTED] - help in body of message >Zerobeat Web Page: http://www.zerobeat.net >Brought to you courtesy of TLCHost.net http://www.tlchost.net/ >----------------------------------------------------------------------
---------------------------------------------------------------------- On Behalf of Jim W7RY Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
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---------------------------------------------------------------------- On Behalf of Garey Barrell <[EMAIL PROTECTED]> Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ ----------------------------------------------------------------------
