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@btconnect.com>
To: <evert@pa2kw.com>; <amps@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@pa2kw.com]
> Sent: 13 February 2009 14:47
> To: 'Adrian Rees (MW1LCR)'; amps@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@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Adrian Rees (MW1LCR)
> Sent: Friday, February 13, 2009 15:07
> To: amps@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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