Re: Antiference switches - bizarre fault

Hang on, surely log-periodics are still short circuited at the other end of
the boom.

Brian

--
Brian Gaff - briang1@xxxxxxxxxxxxxxxx
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Carpy" <carpy@xxxxxxxxxxxx> wrote in message
news:wqYDl.7122$GR6.819@xxxxxxxxxxxxxxxx

"Bill Wright" <insertmybusinessname@xxxxxxx> wrote in message
news:Bv-dnZY0KrUEcULUnZ2dnUVZ8gydnZ2d@xxxxxxxxxxxx

"jamie powell" <jamie_p84@xxxxxxxxxx> wrote in message
news:gromd0$u8i$1@xxxxxxxxxxx

"Bill Wright" <insertmybusinessname@xxxxxxx> wrote in message
news:PrednZNaYIehS0LUnZ2dnUVZ8uKdnZ2d@xxxxxxxxxxxx

Do they shut off until mains power is cycled though?
Or do they get stuck in an endless power-on->overload->trip-off loop?

Most of them are clever enough to simply stay shut down until the
overload is removed. Presumably a few mA are allowed to flow through
the short circuited cable.

You *presume* they're not stuck in an endless loop??

I'd definitely want to check, especially if I was installing them in
places where line power wasn't needed and the circuit was permanently
shorted.

As an installer I have to have some faith in the basic competence of the
designers of the equipment that I install. Whether the devices are stuck
in an endless loop or whether they simply shut down and monitor a very
small current is immaterial to me, because the devices continue to work
regardless, which is all that concerns me. I gave up on worrying about
anything except things that have immediate impact on my existence a long
time ago.

That's the philosophical reply. The technical one is that since these
devices are used more often direct from an aerial than via a masthead
amp, it would be absurd for them to feed significant power into the
aerial input unconditionally. A device that was constantly and rapidly
switching a significant current (derived from the device's power supply),
on the RF input of the said device would very likely cause interference.

Bill


Well I've just had a call that the switch I mentioned above has now ceased
to function completely. Curiously I installed another one of these this
week on a different job, and the "Auto Line Power" light stayed lit when I
connected just a TCX10A. Surely this light should be off when there's
nothing being drawn by a masthead. The one above I mentioned in my
original post, the "Auto Line Power" light went off when I connected a Log
Periodic to it, but as mentioned it also switched off the whole
terrestrial portion of the switch.





.

Relevant Pages

  • Re: Electrical Outlet Wiring
    ... a power strip with a 15' extension cord onto the ceiling and then use those ... ceiling) and one that comes out. ... NOT go on or off with the switch. ... Perhaps the better choice would be to create a brand new circuit just for ...
    (alt.home.repair)
  • Re: Everyone got their generator ready?
    ... are away and the wife gets the neighbour to switch the thing on. ... a power failure. ... In order to hook these up to the grid the invertor has to generate a ... control circuit required to connect an invertor to the grid, ...
    (uk.business.agriculture)
  • Re: Antiference switches - bizarre fault
    ... especially if I was installing them in ... places where line power wasn't needed and the circuit was permanently ... Well I've just had a call that the switch I mentioned above has now ceased ... There will be even more current drawn by the short-circuit aerial, ...
    (uk.tech.digital-tv)
  • Re: Simple circuit help...
    ... > one switch and one wire running through a wing in an airplane. ... > have them on all the time that I have the navigation lights on. ... you can build a little circuit that will 'remember' ... after the power comes up, ...
    (sci.electronics.basics)
  • Re: LCD monitor wont turn on
    ... The front panel power switch itself is functional -- I short out the two ... This could mean the circuit that controls the main power (probably a power ...
    (sci.electronics.repair)