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1. [AMPS] High IMD Drivers (score: 1): Author: bearl@ozemail.com.au (craig); Date: Tue, 1 Sep 1998 18:14:02 +1000; Has anybody built or played with high IMD solid state amplifiers? There is a system called " Feedforward" which is well explained in "Single Sideband Systems & Circuits" But i would like to know if a; /archives//html/Amps/1998-09/msg00002.html (8,297 bytes)
2. [AMPS] High IMD Drivers (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 1 Sep 98 09:36:04 -0500; Craig, I have spent many hours playing with these. I used to design them! Most of the current "linear" amplifiers used in digital cellular service use feed-forward amplifiers. It's an amazing techniq; /archives//html/Amps/1998-09/msg00007.html (14,811 bytes)
3. [AMPS] High IMD Drivers (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 1 Sep 1998 11:23:09 -0400; Feed foreward, aka distriputed amps, have been around for many years in SS and tube form. Some careful searching may locate an older model at an attractive price. I picked up an old Amplifier Researc; /archives//html/Amps/1998-09/msg00009.html (8,778 bytes)
4. [AMPS] High IMD Drivers (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 1 Sep 1998 11:27:30 -0600; Craig, I have spent many hours playing with these. I used to design them! Most of the current "linear" amplifiers used in digital cellular service use feed-forward amplifiers. It's an amazing techniq; /archives//html/Amps/1998-09/msg00012.html (15,564 bytes)
5. [AMPS] High IMD Drivers (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 1 Sep 98 14:17:05 -0500; OOPS! :-) Thanks for catching that one, Dick. You gave me a good middle of the day laugh. It's amazing what our subconscious will put out! :-) 73, Jon KE9NA -- Jon Ogden jono@enteract.com www.qsl.ne; /archives//html/Amps/1998-09/msg00013.html (8,067 bytes)
6. [AMPS] High IMD Drivers (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 1 Sep 1998 19:54:16 +0100; Maybe not deadly at HF, but much worse on VHF where the background noise levels are so much lower. That's a real issue for HF/VHF rigs because the same standards do not apply... I mean OUR standards,; /archives//html/Amps/1998-09/msg00015.html (10,229 bytes)
7. [AMPS] High IMD Drivers (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Tue, 1 Sep 98 15:59:03 -0500; Ahhh....good point! I had neglected the fact that the 847 operates at VHF/UHF. You are correct. Yep. Right again, Ian. For weak signal stuff, the IM could kill other stations. I stand corrected on t; /archives//html/Amps/1998-09/msg00016.html (10,158 bytes)
8. [AMPS] High IMD Drivers (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Wed, 2 Sep 1998 07:39:37 +0100; Joining late here... Notwithstanding comments about which sorts and which levels of IMD 'really' matter, I reckon the only realistic way of getting super clean signals in amateur circumstances is to; /archives//html/Amps/1998-09/msg00023.html (9,790 bytes)
9. [AMPS] high IMD drivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Sep 1998 09:09:21 +0100; Nope, Carl. Feed forward could be applied to a distributed amplifier, but they are totally different beasts. Another approach is either Polar loop or Cartesian loop, both of which are a lot easier fo; /archives//html/Amps/1998-09/msg00024.html (8,316 bytes)
10. [AMPS] high IMD drivers (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Wed, 2 Sep 1998 11:27:46 -0400; I stand corrected and tnx to those who pointed this out to me. 73 Carl KM1H _____________________________________________________________________ You don't need to buy Internet access to use free Int; /archives//html/Amps/1998-09/msg00028.html (8,421 bytes)
11. [AMPS] high IMD drivers (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Wed, 2 Sep 1998 09:16:01 -0600; Hello Peter... I don't have a set of FCC rules here at home, but my recollection is that (in fairly typical FCC fashion) there is no explicit "dB" IMD requirement, at least for amps. Think rules say; /archives//html/Amps/1998-09/msg00030.html (9,576 bytes)

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