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@gmail.com
<mailto:jimw7ry@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.
>
_______________________________________________
Amps mailing list
Amps@contesting.com <mailto:Amps@contesting.com>
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|