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1. [AMPS] Band Pass Filtering (score: 1): Author: vk6apk@eon.net.au (Alek Petkovic); Date: Thu, 29 Apr 1999 05:38:43 +0800; Hey guys, before you get too carried away on where you think the filter should be placed, remember that Jon talked to the guy who makes them and he said the go between the tx and the amp. End of stor; /archives//html/Amps/1999-04/msg00419.html (8,066 bytes)
2. [AMPS] Band Pass Filtering (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 28 Apr 99 17:00:44 -0500; I must say that ICE's customer service has been good. The point is that I do believe a filter should go AFTER an amplifier. But I've been wrong on other things and I could be wrong on this too. I am; /archives//html/Amps/1999-04/msg00420.html (8,940 bytes)
3. [AMPS] Band Pass Filtering (score: 1): Author: notawc@juno.com (notawc@juno.com); Date: Wed, 28 Apr 1999 21:13:47 -0400; On Thu, 29 Apr 1999 05:38:43 +0800 Alek Petkovic <vk6apk@eon.net.au> writes: Thats where they usually go for anyone even basically conversant with the subject mate. AMEN! But you also have to define; /archives//html/Amps/1999-04/msg00425.html (9,696 bytes)
4. [AMPS] Band Pass Filtering (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 28 Apr 1999 21:41:04 -0500; Huh? In all my years in both amateur radio and engineering commercial products I have always seen filters AFTER the final amplifier, not after the exciter. Are you saying that's incorrect? 73, Jon K; /archives//html/Amps/1999-04/msg00432.html (8,723 bytes)
5. [AMPS] Band Pass Filtering (score: 1): Author: k8cc@ix.netcom.com (David A. Pruett); Date: Thu, 29 Apr 1999 00:24:01 -0400; Where the filter needs to be located depends on what you're expecting it to do. ICE, Dunestar, TopTen, K4VX, W3NQN, et al have designed and built filters for HF applications which are used after the; /archives//html/Amps/1999-04/msg00433.html (10,453 bytes)
6. [AMPS] Band Pass Filtering (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 28 Apr 1999 23:42:04 -0500; Hi Dave, Thanks for the note. With regards to ICE's HF filters, Mike Koss there told me today that older designs of their HF filters would fail at less than 200 Watts. They have done some redesigns; /archives//html/Amps/1999-04/msg00434.html (9,603 bytes)
7. [AMPS] Band Pass Filtering (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 29 Apr 1999 09:30:46 +0100; I guess the bottom line is that Jon needs a decent filter at the output - a single cavity would probably do it. Of course, Jon, you could roll your own - there have been a number of designs in the ol; /archives//html/Amps/1999-04/msg00436.html (9,962 bytes)
8. [AMPS] Band Pass Filtering (score: 1): Author: hbrown@voicenet.com (Harry Brown); Date: Thu, 29 Apr 1999 07:33:49 -0400; I doubt that a bandpass filter between the rig and the amp or after the amp is going to do much for most distortion caused by solid state amps. A bandpass filter may reject some LO leakthru (from ban; /archives//html/Amps/1999-04/msg00441.html (10,457 bytes)
9. [AMPS] Band Pass Filtering (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 29 Apr 1999 13:16:32 +0100; As Jon pointed out, his brick contains a preamp, so he wants to protect that too. However, that STILL doesn't require the filter to be capable of handling full TX power. Most commonly, when people ad; /archives//html/Amps/1999-04/msg00442.html (10,347 bytes)
10. [AMPS] Band Pass Filtering (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 29 Apr 1999 13:23:06 +0100; Aaaargh - those ultra-sharp single-cavity bandpass filters are a disaster! They combine all the worst features that a bandpass filter could have: touchy tuning, poor stopband rejection, hit-and-miss; /archives//html/Amps/1999-04/msg00443.html (8,966 bytes)
11. [AMPS] Band Pass Filtering (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Thu, 29 Apr 99 09:49:59 -0500; Why can't the bandpass filter knock out the amps harmonics? Surely it does some benefit. These ICE units are kind of interesting. They use impedance transformation techniques. Basically, they consis; /archives//html/Amps/1999-04/msg00446.html (9,003 bytes)
12. [AMPS] Band Pass Filtering (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 29 Apr 1999 16:10:17 +0100; Firstly, if the amplifier is more than 25 watts output and meets the FCC requirements [Part97.307(e)] it's already got harmonics at least 60dB down, and not exceeding 25 microwatts. So how much pract; /archives//html/Amps/1999-04/msg00448.html (9,808 bytes)
13. [AMPS] Band Pass Filtering (score: 1): Author: notawc@juno.com (notawc@juno.com); Date: Thu, 29 Apr 1999 11:19:43 -0400; Are you saying that you have never heard of a filter between stages???? No, Im saying that two are better. A goesin and a goesout ___________________________________________________________________ Y; /archives//html/Amps/1999-04/msg00449.html (9,512 bytes)
14. [AMPS] Band Pass Filtering (score: 1): Author: notawc@juno.com (notawc@juno.com); Date: Thu, 29 Apr 1999 11:44:12 -0400; I doubt that a bandpass filter between the rig and the amp or after the amp is going to do much for most distortion caused by solid state amps. } No, a harmonic filter will not clean up IMD. But a ha; /archives//html/Amps/1999-04/msg00451.html (11,478 bytes)

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