HI all
I have just about finished upgrading my K1 now (4 band module and backlight) The current drain is about 65-75mA ,depending on volume setting about 70mA for normal listening. I have fitted 2400mA cells that just fit . I have checked the current drain at 4 watts from these cells and it seems about 1000mA (1Amp) So I have worked the following out but would just like a check done Irx = 60 Itx=1000 Tx duty cycle 50% (since CW) Ratio tx/rx 25% So in one hour I would be in tx mode for 15mins drawing 1000mA but since it’s at 50% duty that’s 500mA for 15mins Which works out to 250mA for 30 mins or 125mA for 1 hr Plus the rx drain of say 70mA so that’s 70mA/Hrs Total drain then is 125+70=195mA/Hr Since I have 2400mA/Hr cells that’s 2400/195=12.3Hrs use That just seems at lot of use at 25% tx/rx ratio and with 4 watts output power but it seems right to me., anyone confirm ? One more little mod I have done to the K1 (which I know I will be shot down in flames for !) I wanted the cells in the K1 to be kept topped up ready for action so I found a pin on the on/off switch that only gives 12volts out when the switch is in the OFF position >From this pin I took a feed to the cells via a 1amp diode and series resistor to limit the current to about 25mA on a fully charged pack and about 50-60mA on a flat pack. This only supplies charge to the cells when the k1 is connected to external power and turned off ,so if using the K1 in the field off a gel pack or the like it does don’t add extra drain to the pack when the radio is turned on , when the radio is turned off if you want to save any drain to the pack just unplug it! It works for me. All the best Paul M0BMN -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.12.8/161 - Release Date: 03/11/2005 _______________________________________________ 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
