Re: Electrolytic Capacitor failure

Posted by Bob McGraw - K4TAX on Apr 18, 2020; 2:45am
URL: http://elecraft.85.s1.nabble.com/Electrolytic-Capacitor-failure-tp7659760p7659810.html

When you turn on your power supply and it shows 26 volts, are you going
to turn on your radio?   Thus paying attention to the meters will
protect your radio.   If when operating a contest for hours and you find
the output drops off, wouldn't you glance at the meters?

As to power distribution devices, every contact and connection in the
path adds resistance.  This makes the voltage at the radio vary with
load.   And that variation increases the IMD emitted by your transmitter.

I've seen and evaluated several brands of power distribution strips. 
All are pure crap!   Not suitable for the dynamic load presented by a
SSB or CW radio during transmit.   Observe the power supply voltage on
your radio during receive.  Then in transmit with 100 watts key down. 
If it drops 0.5 volts or more, you have a power distribution problem.

It is much better to connect the radio power cable direct to the power
supply and put the power distribution strip in a bucket of water and
leave it there.

73

Bob, K4TAX


On 4/17/2020 9:03 PM, K8TE wrote:

> Having meters will protect my radio?  I doubt that assertion.
>
> Most radios today remain connected to their power supplies even when turned
> off, much like a computer.  In the case of a K3, it is always connected to
> the power supply, even when off.  So unless we don't connect the K3 to the
> power supply until checking the power supply's Voltage, a Voltmeter on the
> power supply wouldn't do much good.
>
> Additionally, when operating the K3 for hours on end, like in a contest, who
> watches the power supply Voltmeter?  I certainly don't.  I don't know who
> would.  Instead, I use one of those power distribution devices that shuts
> down Voltage to the equipment should it rise too high.
>
> 73, Bill, K8TE
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

--
This email has been checked for viruses by AVG.
https://www.avg.com


______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]