GW0ETF wrote: > > Finally I got round to checking the wattmeter calibration as I've felt > it's been giving out power levels below what the wattmeter on the front > panel reports ever since I've had it. > > First alerted when my Acom 1000 seemed to giving low output until I saw > the amp's input reporting a significantly lower driving power eg 35w as > against a K3 setting of 45w into a dummy load. Also 2 independant power > meters seemed to agree even though admittedly they weren't lab standard. > > So I did the configuration while measuring voltage across a dummy load > with my 40MHz 'scope and found I needed to wind the <WMTR HP> setting way > down to minimum (010) to get the power up to 50 watts on the 'scope (and > yes I did remember the RMS to peak conversion ;-). Seeing that the default > setting is 100 I thought I might ask others what setting seems to be the > norm. > > Needless to say I've not noticed anything odd about running 80 or 85 watts > instead of 100 these past few months but (wrong) numbers do have a habit > of bugging you eventually.... > I was a bit worried about doing this setting as I didn't have any accurately calibrated wattmeter other than my home made QRP ones. In the end I used my DL1 module. It didn't seem to mind handling 50W for the few seconds needed to get the reading on my voltmeter. I think the lowest I needed to wind the setting down to was somewhere in the 70s. If I'd had to go down as low as 10 I would have worried that there was something wrong with my calculations.
----- Julian, G4ILO K3 s/n: 222 K2 s/n: 392 G4ILO's Shack: www.g4ilo.com KComm for K2/K3: www.g4ilo.com/kcomm.html -- View this message in context: http://www.nabble.com/-k3--Wattmeter-calibration-tp18155295p18155740.html Sent from the [K3] mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
