> My K3 increases power by 10% when in Space as opposed to Mark.
Two things here ... 10% is abut 0.4 dB. How did you measure the power difference and did you do so with an instrument with enough resolution to accurately measure that difference at the power level you were using? For example a Bird Wattmeter can't possibly measure with that level of accuracy nor is one likely to be able to read an analog meter that closely. I have measured my K3 on RTTY with a wattmeter traceable to NIST and specified for 3% accuracy and have done so at four specific power levels (25, 55, 80 and 105 Watts) to eliminate any ALC non-linearity or PA compression from consideration. The specific Mark/Space power levels were measured by placing the rig into transmit in FSK_D mode with the FSK input closed (Mark), measuring the power output for a given power setting, then opening the FSK input and noting the PO (and change). In all cases, the difference between MARK and SPACE was less than 2% (less than the meter's specified accuracy) and at two power levels (55 and 80 W) the measured difference was less than 0.2W (<0.2 dB at 55W). These measurements were made with standard "High tones" (2125/2295 Hz) and the K3 was equipped with the optional 2.8 KHz, 8 pole IF filter. 73, ... Joe, W4TV On 2014-11-10 8:42 PM, Bill Lewis wrote:
I am looking for information on how to eliminate incidental AM when using FSK-D. My K3 increases power by 10% when in Space as opposed to Mark. Thanks much, Bill, W8NN ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
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