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Re: [Amps] Input relay for QSK amp

To: Bob Maser <>
Subject: Re: [Amps] Input relay for QSK amp
From: Jim <>
Date: Sat, 8 Dec 2018 22:44:23 -0600
List-post: <>
Oh... And if the relays (either of them) are NOT ready for RF, you get hot switching. As well... If they are DE-energised before RF stops flowing from the exciter, you also have hot switching.

Jim W7RY

On 12/7/2018 9:16 PM, Bob Maser wrote:
I must be old school.  The input relays need to be slower than the output relay. Seems to me that a RJ-1 takes 8ms to close and stop bouncing around. I have always used a P&B miniature open frame DPDT for that purpose.  The output of the amp needs
to be closed before the input turns on.

On Fri, Dec 7, 2018 at 9:39 PM Jim < <>> wrote:

    Those relays that Rich (and I ) used are mostly unavailable. I
    used to
    buy them 100s at a time. No more of them can be had.

    Most of what you find on eBay are seconds and most don't work. Or
    are re-labeled counterfeits.

    Jim W7RY

    On 12/4/2018 4:03 PM, Alek Petkovic wrote:
    > G'day Vic.
    > The Matsushita/Panasonic relay that Rich Measures used in his QSK
    > circuit, published at <>, is still
    available on Ebay. I bought
    > 10 of them a couple of years ago
    > Otherwise, Jim, W7RY, uses a small relay in his QSK kit. He laso
    > on Ebay.
    > 73, Alek.
    > VK6APK
    > On 4/12/2018 6:21 PM, Victor Rosenthal 4X6GP wrote:
    >> I'm trying to choose a relay to use as the input relay in a QSK
    >> I have been very satisfied with the Jennings RJ1-A as an output
    >> relay. The input relay in this circuit needs to be DPDT, or I'd
    >> use two similar vacuum relays.
    >> Here are my needs:
    >> 1. DPDT.
    >> 2. 12 or 24v coil.
    >> 3. Operate/release time, including bounce <= 4 ms. Faster is
    >> 4. Should carry 100w RF in 50 ohm system. Not expected to
    >> live circuit.
    >> 5. Must have low resistance for low-level signals (receive path).
    >> 6. Must have long life >= (10 x 10**6 operations)
    >> 7. Must not be insanely expensive, and available from Mouser or RS.
    >> I found this relay:
    >> But maybe there's a better choice? I'm overwhelmed by the
    number and
    >> varieties of relays in the catalog.
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