K3 KFL3B-FM Change?
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In the past day or two I have noticed a change on the K3 order page. The KFL3B-FM was previously listed as a 7-pole filter at $99.00. It is now listed as an 8-pole filter at $120.00. Is this an "error correction" or a change in the specifications? If this is a change in the specifications, does this indicate data is available for the "new" version and does this represent an improvement in skirt selectivity and ultimate rejection such that the KFL3B-FM can be used successfully for both AM/ESSB transmit and receive? How does this change effect those who have previously placed orders that included the KFL3B-FM? 73, ... Joe, W4TV _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Administrator
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Hi Joe,
We've decided to go with a 8-Pole FM filter manufactured for us by Inrad, instead of the lower performance discrete 7 pole xtal filter we were planning on designing and using. The 8 pole filter has an excellent shape factor and better ultimate rejection than the 7 pole discrete xtal filter. I'll post more data on it next week when I have time. All orders received before the change will be honored at their $79 price and will get the 8 pole filter. All new orders will be at the new price. So if your order confirmation says $79, that's what you will pay. (at our loss) :-) 73, Eric WA6HHQ Joe Subich, W4TV wrote: > In the past day or two I have noticed a change on the K3 order page. > The KFL3B-FM was previously listed as a 7-pole filter at $99.00. > It is now listed as an 8-pole filter at $120.00. > ... > > How does this change effect those who have previously placed orders > that included the KFL3B-FM? > > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Eric, > We've decided to go with a 8-Pole FM filter manufactured for us > by Inrad, instead of the lower performance discrete 7 pole xtal > filter we were planning on designing and using. The 8 pole filter > has an excellent shape factor and better ultimate rejection than > the 7 pole discrete xtal filter. Thank you. I look forward to the data - particularly information on suitability for use with AM/ESSB in both transmit and receive. I can't see where either AM or ESSB are exactly suitable for weak signal operation which would imply some degree of AGC and make 90 to 100 dB of image rejection sufficient for most AM/ESSB use. > All orders received before the change will be honored at > their $79 price and will get the 8 pole filter. I think the most recent price was $99 ... but it's appreciated. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Eric > Swartz - WA6HHQ, Elecraft > Sent: Friday, October 26, 2007 4:02 PM > To: Joe Subich, W4TV > Cc: [hidden email] > Subject: Re: [Elecraft] K3 KFL3B-FM Change? > > > Hi Joe, > > We've decided to go with a 8-Pole FM filter manufactured for us by > Inrad, instead of the lower performance discrete 7 pole xtal > filter we > were planning on designing and using. The 8 pole filter has > an excellent > shape factor and better ultimate rejection than the 7 pole > discrete xtal > filter. I'll post more data on it next week when I have time. > > All orders received before the change will be honored at > their $79 price > and will get the 8 pole filter. All new orders will be at the > new price. > So if your order confirmation says $79, that's what you will pay. (at > our loss) :-) > > 73, Eric WA6HHQ > > Joe Subich, W4TV wrote: > > In the past day or two I have noticed a change on the K3 > order page. > > The KFL3B-FM was previously listed as a 7-pole filter at $99.00. > > It is now listed as an 8-pole filter at $120.00. > > ... > > > > How does this change effect those who have previously placed orders > > that included the KFL3B-FM? _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Administrator
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I stand corrected! :-) Thanks for the info.
Those that paid the old price of "$99.00" for the 7 pole FM filter will still get the 8 pole FM filter for that price. (not $79) New orders will be at $120. 73, Eric Joe Subich, W4TV wrote: > I think the most recent price was $99 ... but it's appreciated. > > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Joe Subich, W4TV
Personally, I cant hear anything above about 4000 Hz, that would be 8Kc bandwidth on AM. The R390a had 4Kc (slightly too narrow) to 8Kc then 16Kc. 4, 6 and 8 Kc are the most useful for me, as that gives 2, 3, and 4Kc audio output if tuned dead on carrier. In the telephone world, equipment allows out to 4Kc. That was considered optimal for intelligibility vs bandwidth. For swl use, 16Kc is not unreasonable for people with good ears, that gives 8Kc audio out.. I hope the K3 can be got to 4Kc in the AM mode tuned dead on the carrier. others might like it even higher, but I can hear it. Brett N2DTS _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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> In the telephone world, equipment allows out to 4Kc. > That was considered optimal for intelligibility vs bandwidth. > The telephone network bandwidth is 3.1kHz (300 to 3400Hz). 4kHz was the analogue bearer channel separation, and allows for realistic shape factors on the channel filters. On digital signals, the 8kHz sampling rate allows the use of realistic anti-aliasing filters when the audio bandwidth is 3.1kHz. > For swl use, 16Kc is not unreasonable for people with good ears, that gives > 8Kc The channel spacing for SW broadcast stations is 5kHz, although I suspect they are are allowed to overlap each other. I'm sure there are standards for this, but I suspect a well maintained transmitter is limited to a similar audio bandwidth as the telephone system, or less. I would think that one would normally expect to be received with a filter that was well down the skirt at 10kHz, so as to suppress the adjacent carriers. Propaganda stations and commercial ones in a poorly regulated environment might well transmit more bandwidth. (Medium and long wave transmissions use 9kHz channel spacing.) -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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