in the relay.
Mel
- Original Message
From: Thomas Oliver [EMAIL PROTECTED]
To: repeater-Builder@yahoogroups.com
Sent: Saturday, April 19, 2008 9:19:26 PM
Subject: [Repeater-Builder] Need time delay circut
I want to install a timer to inhibit ptt until my tubes warm
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Need time delay circut
A couple of ways. 1. Using a NE555 as a timer, circuits are everywhere. 2.
I use a 2N7000 fet and pull in a low current relay on the PTT line. Use a
regulated low voltage to a RC
Ron Wright [EMAIL PROTECTED] wrote:
Off the shelf 3 minute delay timers for air conditioners are common.
3 minutes might be a bit long.
A very good solution. Even tho my 'boss' did not like it, I installed
something very similar on the filament transformer ac line side that
interrupted the
I thought about the AC Time delay timer but it requires AC 24 volts, it
probably would work off of the ac side of the low voltage transformer but
would still require a relay. I have some of the octal time delay relays I
may use on of them.
The other thing I ran across was a carrier control timer
. That way not
consuming power making life longer.
73, ron, n9ee/r
From: Thomas Oliver [EMAIL PROTECTED]
Date: 2008/04/20 Sun PM 06:53:59 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Need time delay circut
I thought about the AC Time delay timer
I want to install a timer to inhibit ptt until my tubes warm up on my
transmitter, anyone got any favorites?
I am using a .375K Micor PURC and when power is interrupted and comes back on
the exciter drives cold tubes. Motorola didn't think that was too much of a
problem I guess.
thanks
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