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1. [CQ-Contest] Bandpass Filter (score: 1): Author: "James" <jms_k1sd@verizon.net>; Date: Sun, 01 Jul 2012 18:03:44 -0400; If I operate single op and never transmit on two bands at once, is a bandpass filter necessary? Is it helpful? 73 / James / K1SD / Rhode Island _______________________________________________ CQ-Cont; /archives//html/CQ-Contest/2012-07/msg00000.html (5,963 bytes)
2. Re: [CQ-Contest] Bandpass Filter (score: 1): Author: Robert Chudek - K0RC <k0rc@citlink.net>; Date: Sun, 01 Jul 2012 20:32:46 -0500; If you have two transceivers, it is possible to 'blow' the front end of the transceiver that is not transmitting. It depends upon power levels, antenna proximity & orientation, and specific radios th; /archives//html/CQ-Contest/2012-07/msg00001.html (7,725 bytes)
3. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Roberts, Will" <Will.Roberts@pgnmail.com>; Date: Mon, 2 Jul 2012 15:54:59 -0400; If you are single op/1 radio and never listen on a band other than the one you are transmitting on, a bandpass filter isn't necessary. If you have a second receiver, then a bandpass filter could be h; /archives//html/CQ-Contest/2012-07/msg00005.html (8,261 bytes)
4. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Tom Frenaye <frenaye@hughes.net>; Date: Mon, 02 Jul 2012 17:55:35 -0400; Assuming it is not just in the receive line, a bandpass filter may help you keep peace with any neighbors who are on the same band and others in the contest - as it will cut down on any extra "crud"; /archives//html/CQ-Contest/2012-07/msg00006.html (9,289 bytes)
5. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Mon, 2 Jul 2012 18:24:46 -0700; If you are going to use two radios then bandpass filters (BPF) will be needed to protect each of them when one or the other transmits, assuming enough coupled power. Coupled power occurs with power o; /archives//html/CQ-Contest/2012-07/msg00007.html (12,275 bytes)
6. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 2 Jul 2012 21:53:55 -0400; A traditional bandpass filter does nothing for same-band overload or interference, because by definition it passes the entire band. The exception would be crystal or other very high Q narrow bandwid; /archives//html/CQ-Contest/2012-07/msg00008.html (9,260 bytes)
7. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Dave Hachadorian" <k6ll@arrl.net>; Date: Mon, 2 Jul 2012 21:10:27 -0700; Assuming it is not just in the receive line, a bandpass filter may help you keep peace with any neighbors who are on the same band and others in the contest - as it will cut down on any extra "crud"; /archives//html/CQ-Contest/2012-07/msg00010.html (8,603 bytes)
8. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Joe <nss@mwt.net>; Date: Tue, 03 Jul 2012 08:37:23 -0500; Never have run this mode, if this IS a large problem, then how do SO2R stations work without blowing everything up? Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.i; /archives//html/CQ-Contest/2012-07/msg00011.html (10,189 bytes)
9. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Joe <nss@mwt.net>; Date: Tue, 03 Jul 2012 08:35:12 -0500; This whole filtering thing.... Can they not make front ends rugged enough to survive these situations? Or for that matter, Now I have not had the blessing of playing with a K3, so do not know what it; /archives//html/CQ-Contest/2012-07/msg00012.html (14,870 bytes)
10. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 3 Jul 2012 11:00:32 -0400; Nearly all modern radios have excellent harmonic suppression, while external power amplifiers do not. If we have a second harmonic issue, a critically located stub or stubs, or a trap, is far more e; /archives//html/CQ-Contest/2012-07/msg00013.html (10,590 bytes)
11. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Radio K0HB" <kzerohb@gmail.com>; Date: Tue, 03 Jul 2012 10:17:37 -0800; My one-year-old FTdx-5000 is essentially immune to adjacent transmitter overload. Best I've ever seen, and I go back a ways, including 21 years as a Navy Radioman. 73, de Hans, K0HB But when it comes; /archives//html/CQ-Contest/2012-07/msg00017.html (9,107 bytes)
12. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Jukka Klemola <jpklemola@gmail.com>; Date: Tue, 3 Jul 2012 20:16:02 +0300; ... Correct for fully functioning and tuned amplifier. In case a glitch happens or when tuning the amp, the harmonic emission level may exceed the presented figures. Likely more than 20dB yes. It sav; /archives//html/CQ-Contest/2012-07/msg00018.html (11,487 bytes)
13. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Jukka Klemola <jpklemola@gmail.com>; Date: Tue, 3 Jul 2012 20:38:13 +0300; Some work with luck .. usually not for more than a contest or two. Then they realize they need to design the station and use the station to the specifications they created. Making a station capable o; /archives//html/CQ-Contest/2012-07/msg00019.html (11,963 bytes)
14. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 3 Jul 2012 14:28:09 -0400; 40 milliwatts or so is a correct worse case for any amp, in or reasonably out-of-tune, unless someone homebrewed something terrible. Very few radios are damaged by 200 milliwatts, or 23 dBm. The dam; /archives//html/CQ-Contest/2012-07/msg00020.html (9,717 bytes)
15. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Tue, 3 Jul 2012 15:06:53 -0700; I recently measured the power coming back down my 20m line while transmitting on 15m. It's over 135 watts of power when using my K3 and Acom 2000 at 1500w forward output. Not milliwatts... A W3NQN BP; /archives//html/CQ-Contest/2012-07/msg00021.html (12,821 bytes)
16. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 3 Jul 2012 21:37:28 -0400; Fundamental power. That's no surprise if the antennas are real close in terms of wavelength. If you look at 160 meters, two dipoles 1/4 wave apart can have well over 20% of applied power into the RX; /archives//html/CQ-Contest/2012-07/msg00022.html (10,488 bytes)
17. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Timothy Coker <n6win73@gmail.com>; Date: Tue, 3 Jul 2012 18:57:02 -0700; I should have properly stated that the addition of a 23' open stub on the 20m line brought the measured back fed power down to less than 1 watt. I was writing on the Droid at my work parking lot and; /archives//html/CQ-Contest/2012-07/msg00023.html (9,622 bytes)
18. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Jeff Blaine" <jeff@ac0c.com>; Date: Tue, 3 Jul 2012 22:19:05 -0500; The specific coupling is going to vary with a ton of factors. But I am sure the C31 is going to be a pretty rough case. 5B4AGN measured coupling between the separate feed configurations and found -12; /archives//html/CQ-Contest/2012-07/msg00024.html (10,973 bytes)
19. Re: [CQ-Contest] Bandpass filter (score: 1): Author: Jukka Klemola <jpklemola@gmail.com>; Date: Wed, 4 Jul 2012 09:56:29 +0300; Now this gets very interesting ! Correct. That is, what Ton wrote earlier about, was the harmonic. But a multi-radio station cannot rely only on harmonic design. The fundamental frequency cannot exac; /archives//html/CQ-Contest/2012-07/msg00025.html (12,923 bytes)
20. Re: [CQ-Contest] Bandpass filter (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Wed, 4 Jul 2012 09:52:50 -0500; Does not take rocket science to question your measurement of 135 watts feedback power. About the only way this could happen is if the two antennas were physically attached together. And that is even; /archives//html/CQ-Contest/2012-07/msg00026.html (14,162 bytes)

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