[Elecraft] Fool proof kill switch = deadman timer?

[Rick WA6NHC]

My Motorola SurfBoard modem that I used on Comcast requires 12V @ .75 
amp supply.  If you are using the same or similar, why not:

1)  Put the wall wart on a UPS or
2)  Float a 12V battery on the power input to the modem or
3)  Put the modem on your 12V rail (presuming it's on a constant supply, 
like a battery, use ferrites just in case)?

Since Comcast provides VoIP phone service, they are typically required 
to keep the hardware in their lines running (on battery typically, so 
the phones [for 911 at least] don't fail) so even if the power is out in 
your area, there should be service on your coax.

Keeping your modem alive is the simplest solution, regardless of the 
power fluctuations.  Your computer should be treated in a similar 
manner, they have less of a sense of humor about power issues.

If you want to look at what the modem is seeing (signal strength, 
channels, frequencies, etc) in your browser look at: 192.168.100.1 
(which also includes a means of resetting and rebooting from your 
computer, just don't do that while remotely controlling it).

73,
Rick WA6NHC/7 (now from North Idaho)



On 5/29/2017 8:20 AM, Jim Miller wrote:
> In considering remote operation options I'm still struggling with how to
> implement a kill switch that is foolproof.
>
> Last night we had several power glitches that left our Comcast modem hung
> up. There was really no service outage in the area so all it took was
> unplugging and replugging the modem to restore it. Of course it took nearly
> 5 minutes to completely come alive with internet service active.
>
> This happens often enough that it makes me concerned that if internet
> service is interrupted while I'm operating remotely I wouldn't be able to
> kill the transmitter output.
>
> So I'm wondering if a better option is to have a deadman timer to kill the
> K3 and amp output. Not sure what criteria I would use to reset the deadman.
> I'm sure a Raspberry Pi or similar could be programmed to do the work.
>
> Suggestions welcomed!
>
> jim ab3cv
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to wa6nhc at gmail.com