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Total 6 documents matching your query.

1. [AMPS] Alpha 89 SWR protection (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Fri, 19 Mar 1999 00:41:23 -0500; Can anyone tell me if the SWR protection circuits on the Alpha 89 are as sensitive as those on the 87A? Specifically, can the amp be tuned for full output into a 3:1 mismatch, or will that trip the p; /archives//html/Amps/1999-03/msg00460.html (7,636 bytes)
2. FW: [AMPS] Alpha 89 SWR protection (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 19 Mar 1999 17:01:48 -0700; Dick... Load SWR protection is generally similar in both the ALPHA 87A and 89. Both respond to reflected power, rather than actual SWR, primarily in order to protect the T/R PIN diodes from abnormall; /archives//html/Amps/1999-03/msg00500.html (8,811 bytes)
3. [AMPS] Alpha 89 SWR protection (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Sat, 20 Mar 1999 01:12:20 -0500; Both kW Ah. Thanks, Dick. After four years of owning one, I finally understand the reason for the 250W reflected power trip used in the 87A. I never thought about the PIN diodes! It's not been a pro; /archives//html/Amps/1999-03/msg00503.html (10,225 bytes)
4. FW: [AMPS] Alpha 89 SWR protection (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Sat, 20 Mar 1999 16:07:17 -0700; Thanks for the note, Dick... Bigger PINs are available but the cost goes up pretty sharply if one tries to do it "brute force." My preference is to protect and match - like your idea at the end. I us; /archives//html/Amps/1999-03/msg00515.html (10,963 bytes)
5. [AMPS] Alpha 89 SWR protection (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sun, 21 Mar 1999 10:57:21 -0500; On Sat, 20 Mar 1999 01:12:20 -0500 "Dick Green" <dick.green@valley.net> writes: SNIP Why not parallel another inv V for 75M on the same feed? If you can manage at least a 45 degree angle between them; /archives//html/Amps/1999-03/msg00520.html (8,268 bytes)
6. [AMPS] Alpha 89 SWR protection (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 22 Mar 1999 10:30:03 -0000; or is a Unitrode do a 4900 series, with 1000 volt reverse breakdown, and fairly long (7 - 10 microsecond) recovery times. I figured on needing 2 in series for 1000watts with a high SWR. But you do n; /archives//html/Amps/1999-03/msg00542.html (8,100 bytes)

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