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Total 9 documents matching your query.

1. [Amps] Noisy relay (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 11 Dec 2022 09:39:30 -0700; Commander HF-2500.. Every time the T/R relay goes back to receive, I'm getting a pretty big RF spike that I can hear in the receiver. This has nothing to do with the transceiver hot switching or RF s; /archives//html/Amps/2022-12/msg00027.html (6,465 bytes)
2. Re: [Amps] Noisy relay (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Sun, 11 Dec 2022 17:05:55 +0000 (UTC); You are probably hearing the bias switching relay changing the bias. Sent from the all new AOL app for iOS Commander HF-2500.. Every time the T/R relay goes back to receive, I'm getting a pretty big; /archives//html/Amps/2022-12/msg00028.html (7,424 bytes)
3. Re: [Amps] Noisy relay (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sun, 11 Dec 2022 14:48:57 -0800; Steve, you might be hearing the induced voltage kick caused by the inductance of the coil. Try putting a clamping diode. A small signal diode like a 1n914 will work fine, 73, Jim w8zr Sent from my iP; /archives//html/Amps/2022-12/msg00029.html (7,549 bytes)
4. Re: [Amps] Noisy relay (score: 1): Author: "Tim Duffy" <k3lr@k3lr.com>; Date: Sun, 11 Dec 2022 21:00:02 -0500; Hello Jim Does that clamping diode across the coil affect the TX key up delay time? As in "slow it down"? 73 Tim K3LR Steve, you might be hearing the induced voltage kick caused by the inductance of; /archives//html/Amps/2022-12/msg00030.html (8,797 bytes)
5. Re: [Amps] Noisy relay (score: 1): Author: "hzp_electronics@juno.com" <hzp_electronics@juno.com>; Date: Mon, 12 Dec 2022 03:02:37 GMT; The relay diode does not affect the closure time. It only extends the relay opening time. .... Bill K3HZP Hello Jim Does that clamping diode across the coil affect the TX key up delay time? As in "sl; /archives//html/Amps/2022-12/msg00033.html (9,191 bytes)
6. Re: [Amps] Noisy relay (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sun, 11 Dec 2022 22:47:31 -0800; Hi Tim, Yes a clamping diode will slow down the release time of a dc relay. The time constant (release time) is approximately L/R, where L is the relay coil inductance and R is the coil resistance. I; /archives//html/Amps/2022-12/msg00035.html (9,646 bytes)
7. Re: [Amps] Noisy relay (score: 1): Author: "Tim Duffy" <k3lr@k3lr.com>; Date: Mon, 12 Dec 2022 02:38:19 -0500; Thanks Jim My concern is with the diode(s) across the relay(s) coil (or Zener diode combo) does it affect the timing on the front end closure of the relays? As in TX delay settings? So when the relay; /archives//html/Amps/2022-12/msg00036.html (10,316 bytes)
8. Re: [Amps] Noisy relay (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Mon, 12 Dec 2022 04:28:10 -0800; Tim, if I understand your question correctly, the diode will have no effect on the closing time of a d.c relay, because the diode is always back-biased, with its cathode tied to the positive terminal; /archives//html/Amps/2022-12/msg00037.html (11,676 bytes)
9. Re: [Amps] Noisy relay (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 12 Dec 2022 08:11:57 -0500; The table shown on page 2 of this P&B white paper compares drop-out time from a common 12V frame relay relative to coil suppression type. In this example, a Zener with a breakdown voltage of 2X the s; /archives//html/Amps/2022-12/msg00038.html (7,943 bytes)

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