[Amps] Step Start Relay

[Evert Bakker (PA2KW)]

I'm using them with rising confidence and pleasure for years now. Less
hardware, less cost and reliable.

73's, Evert PA2KW

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Hsu
Sent: Friday, February 13, 2009 23:22
To: Adrian Rees (MW1LCR)
Cc: amps at contesting.com
Subject: Re: [Amps] Step Start Relay

I have discussed with M.A. Erickson,KK5DR  two years ago.
,he told me that NTC can not use in step-start,
 It is due to the current rating limted.But I think we can get very large
current
 rating NTC now. I have not to test it.
      73!Hsu
----- Original Message ----- 
From: "Adrian Rees (MW1LCR)" <rees.a at btconnect.com>
To: <evert at pa2kw.com>; <amps at contesting.com>
Sent: Friday, February 13, 2009 10:59 PM
Subject: Re: [Amps] Step Start Relay


> Erm, forgive me...NTC ?
> 
> Adrian
> 
> -----Original Message-----
> From: Evert Bakker (PA2KW) [mailto:evert at pa2kw.com] 
> Sent: 13 February 2009 14:47
> To: 'Adrian Rees (MW1LCR)'; amps at contesting.com
> Subject: RE: [Amps] Step Start Relay
> 
> 
> Adrian,
> 
> Just use a NTC and you can just put it in the same cabinet.
> 
> 73's, Evert PA2KW
> 
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Adrian Rees (MW1LCR)
> Sent: Friday, February 13, 2009 15:07
> To: amps at contesting.com
> Subject: [Amps] Step Start Relay
> 
> Hi all
> 
> I am near completion of the re-build of the power supply of my Dentron
> ML2500 linear, and all is well. I now wish to add a Step Start facility.
> However, there is limited space within the case of the linear so an
> external step start would be in order. (I also have a TL922 as well as a
> home brew 144MHz Linear, all of which would benefit from a step start
> facility).
> 
> I was wondering what duration of delay to use with the step start. I
> think about 250mS - 500mS would be about right. What are the groups
> thoughts on this ?
> 
> I have a delay relay that will do the job, as its contacts are rated at
> 500v at 16A (AC), although the shortest delay on this relay is 1 second.
> 
> 
> Thoughts anyone ?
> 
> Thanks
> 
> Adrian MW1LCR 
> 
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