Yes - that's why I'm engineering it so the PTT line operates the chip
reset pin and only brings the PSU up via its soft-start on transmit.
'JNT
-----Original Message-----
From: Nick [mailto:[email protected]]
Sent: 2001-02-01 18:52
To: [email protected]
Subject: Re: LF: RE: 3C85 Material: Obsolete?
On Thu, 1 Feb 2001 13:02:29 -0000 , you wrote:
>A pair of car batteries used on a /P expedition could easily
> discharge to 20V. The modern high power DMOS devices (for
> 1.3, 2.3 and 3.4 GHz) that this PSU is aimed at powering
> like a constant 28V Vcc so a straightforward SMPSU looks the
> obvious solution. If two batteries have to be used, then
> used in parallel they can be charged together from a car engine.
>
> Also, the same PSU design can be adapted for 50V devices
> which would need 4 batteries in series.
>
Good reason, it is just that the EMC engineer in me has a
pronounced dislike of
any switching devices near radios!
Nick
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