[Amps] Input relay for QSK amp

[Jim]

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.



Thanks
73
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.
> Bob
>
> On Fri, Dec 7, 2018 at 9:39 PM Jim <jimw7ry at gmail.com 
> <mailto:jimw7ry at gmail.com>> 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
>     they
>     are re-labeled counterfeits.
>
>
>     Thanks
>     73
>     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 somis.org <http://somis.org>, 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
>     deals
>     > 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
>     amp.
>     >> 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
>     just
>     >> 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
>     better.
>     >> 4. Should carry 100w RF in 50 ohm system. Not expected to
>     make/break
>     >> 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:
>     >>
>     <https://www.mouser.co.il/datasheet/2/418/NG_SS_108-98005_L-1019204.pdf>
>     >> But maybe there's a better choice? I'm overwhelmed by the
>     number and
>     >> varieties of relays in the catalog.
>     >
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