From: "John T. M. Lyles" <[EMAIL PROTECTED]>
Spent some time building a 1 kW dummy load, to test it to full output. That
was a moderate success as the two 12 inch Globar-like resistors I settled
on had horrible tempcos, and VSWR would drift up as they got hot (107 deg C
on the surface, had a high velocity fan blown on them). I have been
wondering where I could find one of those toaster element (Ohmweve
resistors) built-in dummy loads like Gates used to build into their BC
rigs. Anyone got an extra one for cheap?
You are probably exceeding the rating of the Globars. A 12" one is rated
only at about 150 watts, so if you are running a kw into 2 of them that is
about a 150% overload. I built one out of a dozen 600-ohm globars wired in
parallel. That should be rated at about 1800 watts continuous. I was given
the grobars n.i.b. (dated 1945) from the estate of an old gentleman after
all his "good" stuff (i.e. SSB xcvr and linear) had been sold. It measures
50 ohms exactly using a DVM, and the SWR doesn't change even after running a
kw into it for hours.
Don K4KYV
_________________________________________________________________
Our best dial-up offer is back. Get MSN Dial-up Internet Service for 6
months @ $9.95/month now! http://join.msn.com/?page=dept/dialup
