Bob
The purpose of snubbers is to keep the dv / dt generated from switching an
inductive load to a value below that specified for the particular triac or
scr in the switch. Nothing to do with rf---it protects the scr or triac.
They also find application placed across inductive loads reducing emi
generated anytime an inductive load is switched---by any means.
The old scr and triac handbooks by GE, Westinghouse, and others are a wealth
of information on the design values for snubber networks.
Paul K0UYA
----- Original Message -----
From: "Bob Maser" <bmaser@tampabay.rr.com>
To: "Paul Kraemer" <elespe@lisco.com>; <k3lr@k3lr.com>; "'Alex Eban'"
<alexeban@gmail.com>; "'AMPS'" <amps@contesting.com>; "John Lyles"
<jtml@losalamos.com>
Sent: Thursday, January 29, 2009 10:25 AM
Subject: Re: [Amps] Crydom Solid State Relays
> Since I don't use long wires or twin lead feed lines, I don't have any
> problems with RF in the shack. I think that what I'll do is put an .01
> cap across the control connections and see how that works. If I have
> problems, I'll try snubbers.
>
> Thanks for all the input,
>
> Bob Maser W6TR
> ----- Original Message -----
> From: "Paul Kraemer" <elespe@lisco.com>
> To: <k3lr@k3lr.com>; "'Alex Eban'" <alexeban@gmail.com>; "'AMPS'"
> <amps@contesting.com>; "John Lyles" <jtml@losalamos.com>
> Sent: Thursday, January 29, 2009 3:32 PM
> Subject: Re: [Amps] Crydom Solid State Relays
>
>
>> There is the Quencharc but they are pricey. Just make your own using
>> 630wvdc
>> poly caps and 1/2 watt resistors.
>> Give me a load you are working with and I can point you in right
>> direction
>> for calulating values.
>> Paul K0UYA
>> ----- Original Message -----
>> From: "Tim Duffy K3LR" <k3lr@k3lr.com>
>> To: "'Alex Eban'" <alexeban@gmail.com>; "'AMPS'" <amps@contesting.com>;
>> "John Lyles" <jtml@losalamos.com>
>> Sent: Thursday, January 29, 2009 1:19 AM
>> Subject: Re: [Amps] Crydom Solid State Relays
>>
>>
>>> Is there a suggested Mouser available "snubber" capacitor R/C combo that
>>> has
>>> worked well?
>>>
>>> Maybe you or John know the correct part for us?
>>>
>>> Thanks
>>> 73,
>>> Tim K3LR
>>>
>>> -----Original Message-----
>>> From: Alex Eban [mailto:alexeban@gmail.com]
>>> Sent: Thursday, January 29, 2009 1:10 AM
>>> To: k3lr@k3lr.com
>>> Subject: RE: [Amps] Crydom Solid State Relays
>>>
>>> ...the Crydoms are "quieted" inside, so they don't need RFI protection!
>>> However, I would warmly recommend to include a snubbing capacitor across
>>> the
>>> power pins just like you do with regular relays.
>>> This is meant to prevent switching transients from "roasting" the power
>>> section of the relay.
>>> Alex 4Z5KS
>>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
>>> On
>>> Behalf Of Tim Duffy K3LR
>>> Sent: Thursday, January 29, 2009 7:27 AM
>>> To: 'Bob Maser'; 'AMPS'
>>> Subject: Re: [Amps] Crydom Solid State Relays
>>>
>>> Hi Bob:
>>>
>>> I have used Crydom SSR relays in AC ON and step start circuits for 15
>>> years
>>> with no special bypassing. No problems at all with this set up.
>>>
>>> 73,
>>> Tim K3LR
>>> http://www.k3lr.com
>>>
>>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
>>> On
>>> Behalf Of Bob Maser
>>> Sent: Wednesday, January 28, 2009 7:08 PM
>>> To: AMPS
>>> Subject: [Amps] Crydom Solid State Relays
>>>
>>> The power supply of my new amplifier will be using 3 40A Crydom SSR
>>> relays,
>>> One on each leg of the 240VAC and another in one leg to short out the
>>> step
>>> start resistor. I have been planning on using the SSR's w/o any
>>> resistors
>>> or capacitors across the control connections but I have been advised
>>> that
>>> I
>>> should put resistors and capacitors across the control connectors to
>>> prevent
>>>
>>> RF from affecting the SSR function and possibly causing "chatter". I
>>> would
>>>
>>> appreciate some feedback from the group. I don't believe that Jerry
>>> Pittenger K8RA used anything in the 3CX1500D7 amp that was featured in
>>> the
>>> 2006 ARRL Handbook.
>>>
>>> Bob Maser W6TR
>>>
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>>
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