re: [Elecraft] Roofing Filter question
>I have a K3/10 on order. I have used my K2 for over a year and find >the filters to be very good. I operate 90% on the time on QRP >CW. I'm looking for opinions on which roofing filters I might include. Unless you're contesting or dealing with DX pileups, probably none. The default 2.7 kc filter works fine. One of the reasons I purchased a K3 was that it had 5 roofing filter slots and a whole slew of filters available to fill them up. When my K3 kit arrived in June, it came with only the 2.7 KHz filter-- my CW filters were on back order. I notice a huge difference when I installed the 400 Hz filter. Right now, I own two SSB filters and four CW filters, and am evaluating which three of the four CW filters I want to keep. My application is mainly DX pileups, sometimes along with some close neighbors. 73, Chuck NI0C K2/10 s/n 5853 K3/100 s/n 1061 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
I have a K3/10 on order. I have used my K2 for over a year and find the filters to be very good. I operate 90% on the time on QRP CW. I'm looking for opinions on which roofing filters I might include. Unless you're contesting or dealing with DX pileups, probably none. The default 2.7 kc filter works fine. Paul N4LCD ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
Fred Atchley wrote: > > The rig I used for the California > QSO party was new and had a Collins 500Hz "virtual" roofing filter. During > the contest some stations could copy me but I could not copy them due to > the > pumping generated by adjacent signals. A 70Mhz 1st i.f. with a 20Khz filter just ain't gonna cut it in a tight cw contest, even if you creatively name the 2nd i.f. filters. 73, Barry N1EU -- View this message in context: http://n2.nabble.com/Roofing-Filter-question-tp1674625p1675584.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Roofing Filter question
Mike, If you do any contesting or if you want to operate during a contest, roofing filters are the way to go. As I get older the "pumping" noise from adjacent signals has become ever more distracting. The rig I used for the California QSO party was new and had a Collins 500Hz "virtual" roofing filter. During the contest some stations could copy me but I could not copy them due to the pumping generated by adjacent signals. I now use a K3 with "real" 2.8 kHz, 1.8 kHz and 400 Hz roofing filters. The improvement was dramatic. 73, Fred, AE6IC. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
Joe, I agree with Jim's advice here. I have used my K3 several times in CW contests from Aruba as P49Y, most recently on a 40m single band operation in CQWW, on a very crowded band. For that kind of usage, I think the narrow CW filter is advisable. With it, I was never bothered by signals even a few hundred Hertz away (unless they had clicks extending into my passband, of course), and I think the DSP along with the 2.7 kHz filter wouldn't have stopped the loudest signals. BTW, one think that makes the K3 such a great run radio is that in those circumstances you also have a very clean passband, devoid of the kind of digital artifacts that I hear, for example, on my 756 Pro2 on a crowded band. 73, andy, ae6y - Original Message - From: "Jim Brown" To: "Elecraft List" Sent: Thursday, December 18, 2008 8:52 AM Subject: Re: [Elecraft] Roofing Filter question On Thu, 18 Dec 2008 08:14:51 -0800, Joe Planisky wrote: I recently added the 400 Hz filter and so far, it makes virtually no difference EXCEPT in the case where there's a strong signal within +/- 1 kHz or so of the station I'm trying to work. Note that a "strong signal" might be another ham station, a broadcast station, RFI, etc. Yes. Remember that the IF in the K3 has EXTENSIVE IF filtering that perform the function of crystal filters in older radios. Those filters can be adjusted (front panel knob) to virtually any bandwidth between 50 Hz and 6 kHz, and are the equivalent of a selectable filter bank of 20 or more expensive filters! The roofing filter simply sits IN FRONT OF these IF filters. It protects them from overload, AND provides additional skirt selectivity. The radio works fine for routine use with nothing more than the stock 2.7 kHz roofing filter. The roofing filters simply improve performance under difficult conditions. I own two K3s, one with 400 Hz and 1.8 kHz filters, the other with only a 400 Hz filter. I operated from two QTHs during the SSB weekend of Sweepstakes. At one QTH I had the 1.8 kHz filter, at the other I did not. The 1.8 kHz filter helped, but I was still quite happy with the radio that didn't have the 1.8 kHz filter. 73, Jim K9YC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
On Thu, 18 Dec 2008 08:14:51 -0800, Joe Planisky wrote: >I recently added the 400 Hz >filter and so far, it makes virtually no difference EXCEPT in the case >where there's a strong signal within +/- 1 kHz or so of the station >I'm trying to work. Note that a "strong signal" might be another ham >station, a broadcast station, RFI, etc. Yes. Remember that the IF in the K3 has EXTENSIVE IF filtering that perform the function of crystal filters in older radios. Those filters can be adjusted (front panel knob) to virtually any bandwidth between 50 Hz and 6 kHz, and are the equivalent of a selectable filter bank of 20 or more expensive filters! The roofing filter simply sits IN FRONT OF these IF filters. It protects them from overload, AND provides additional skirt selectivity. The radio works fine for routine use with nothing more than the stock 2.7 kHz roofing filter. The roofing filters simply improve performance under difficult conditions. I own two K3s, one with 400 Hz and 1.8 kHz filters, the other with only a 400 Hz filter. I operated from two QTHs during the SSB weekend of Sweepstakes. At one QTH I had the 1.8 kHz filter, at the other I did not. The 1.8 kHz filter helped, but I was still quite happy with the radio that didn't have the 1.8 kHz filter. 73, Jim K9YC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
I have a K3/10 which I use for CW. I got the 13 KHz (for AM bcst) and 500 Hz filters, which I'm happy with. I could get a narrower one but just haven't felt the need for it yet. 73, Drew AF2Z On Thu, 18 Dec 2008 06:03:43 -0800 (PST), Mike, W9QS wrote: >I have a K3/10 on order. I have used my K2 for over a year and find the >filters to be very good. I operate 90% on the time on QRP CW. I'm looking >for opinions on which roofing filters I might include. > > > >73,72 > >Mike, W9QS >EX: KN6TBP (1956), K1DGQ, DL4KM, K5LJN, W9FRR, W9KVF > ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
I would echo the other responses that you may well not need any narrower roofing filters. You might try using just the stock 2.7 kHz filter for a while and see how it goes. I recently added the 400 Hz filter and so far, it makes virtually no difference EXCEPT in the case where there's a strong signal within +/- 1 kHz or so of the station I'm trying to work. Note that a "strong signal" might be another ham station, a broadcast station, RFI, etc. If you're interested in listening to shortwave or AM broadcast stations on your K3, then you might consider the 6 kHz (AM) or 13 kHz (FM) filters. Of course, you'll also need those filters if you intend to operate those modes. There's a good article on the Elecraft web site about roofing filters. Check out http://www.elecraft.com/K3/Roofing_Filters.htm 73 -- Joe KB8AP On Dec 18, 2008, at 6:03 AM, Mike, W9QS wrote: I have a K3/10 on order. I have used my K2 for over a year and find the filters to be very good. I operate 90% on the time on QRP CW. I'm looking for opinions on which roofing filters I might include. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
Hi Mike, Buck may be right, maybe none.? But, based on my first experience with the K3 in the fox hunt the other night, if you have to buy one, a 400hz filter might be a good choice.? I can see where it might make a difference when you find the fox nudged right next to a strong non QRP station.? Either way the K3 is a big step up from the K2.? I haven't found myself wanting a tighter filter yet. Good luck in the 40M tonight.? Work got the way tonight and I'm 4,000 miles away from my rig in Switzerland.? I hope I got to help you spend your money. HI! Chuck? HB9/K4QS -Original Message- From: Mike, W9QS To: elecraft Sent: Thu, 18 Dec 2008 9:03 am Subject: [Elecraft] Roofing Filter question I have a K3/10 on order. I have used my K2 for over a year and find the filters to be very good. I operate 90% on the time on QRP CW. I'm looking for opinions on which roofing filters I might include. 73,72 Mike, W9QS EX: KN6TBP (1956), K1DGQ, DL4KM, K5LJN, W9FRR, W9KVF K2, OHR500, Norcal 20, SP1 Fists #12327, FP #268, OOTC #4423, QRPARCI #9521 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Roofing Filter question
Maybe none. You get great filtering out of the DSP. The roofing filters are most helpful when very strong signals are present nearby. Operating mostly QRP, you might never run into that problem. k4ia Buck Fredericksburg, VA K3# 101 In a message dated 12/18/2008 9:04:42 A.M. Eastern Standard Time, w...@yahoo.com writes: I have a K3/10 on order. I have used my K2 for over a year and find the filters to be very good. I operate 90% on the time on QRP CW. I'm looking for opinions on which roofing filters I might include. 73,72 Mike, W9QS EX: KN6TBP (1956), K1DGQ, DL4KM, K5LJN, W9FRR, W9KVF K2, OHR500, Norcal 20, SP1 Fists #12327, FP #268, OOTC #4423, QRPARCI #9521 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com **One site keeps you connected to all your email: AOL Mail, Gmail, and Yahoo Mail. Try it now. (http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom0025) ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Roofing Filter question
I have a K3/10 on order. I have used my K2 for over a year and find the filters to be very good. I operate 90% on the time on QRP CW. I'm looking for opinions on which roofing filters I might include. 73,72 Mike, W9QS EX: KN6TBP (1956), K1DGQ, DL4KM, K5LJN, W9FRR, W9KVF K2, OHR500, Norcal 20, SP1 Fists #12327, FP #268, OOTC #4423, QRPARCI #9521 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
