If anyone wants a PDF of the data, please send me an email direct to rob@... Rob

Here is some data I have at both 100 watts and 30 or 35 watts for six rigs. Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data. AR

Darn, the picture was stripped out by the reflector. I’ll work around this somehow. Rob, NC0B

Here is some data I have at both 100 watts and 30 watts for four rigs. Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data. ARRL la

There may be a typo in paragraph 1, sentence 2 below. Add other poor transmitted phase noise rigs: FTdx-3000 (Wipes out 15 meters in Boulder, CO, for example, when an FT-1000MP does NOT.) FT-891 (From

I had trouble navigating their website just now, as it appears to be in transition. The 6-pole 200-Hz roofing filter was designed to have lower passive intermodulation. I have not tested one since one

I suppose they could be operated outside the K3, but I have no idea how. The phase noise of the old synths are not that good. You would be better off with an SI570 if you want to build something. It d

Are you asking how to measure the phase noise and AM noise (total composite noise) of the old synths? They could be reinstalled and then measure RMDR on receive with a very clean crystal oscillator, o

I believe there were running updates way past 2750. K3S I believe started at 10,000. Rob, NC0B

Thanks Michael, Your comments make perfect sense. Your location noise level sounds great for an urban location. Rob, NC0B

The noise floor of the K3 without the preamp has improved from the original value as seen from the 2008 data on my website. Now preamp 1 on a K3S has only a modest noise floor reduction. Preamp 2 in a

A turnstile is what WWV is using on 25 MHz. Rob, NC0B

No I don’t know about the angle on 6m. On 6m any antenna would have lots of lobes due to height above ground in wavelengths. Rob, NC0B

Directivity is always your friend, often even more so than gain. A yagi with a clean pattern reduces noise, QRM and QRN. A 4 or 5 element yagi on 6m would be much more useful than stacking and phasing

Hi Harry, I think your comments are cogent. I have run a 7300 in 9 major contest and a 7610 in four major contests, and they perform very well. I am also not in RF Alley in the plains of Colorado. Whe

The 76 dB value for one of the 7610s on my website was with IP+ OFF (dither and random OFF). Sample variation with the Icom radios is less with IP+ ON. The same is likely true of Apache products. Sinc

The Sherwood table: There are several samples on my website of the K3 and now K3S over the past 10 years. There are two samples of the 7610 and 7300. There are also two samples of Flex 6300 and of the

What is the question? Rob Sherwood, NC0B

Hi Keith, Data below from my friend N0QO, who has a good bit of K3 experience. 73, Rob, NC0B The cooling for them relies on a good mechanical connection to the lower case. I suspect many of the kits a

If you had the 10 watt K3 / K3S, the operator could easily decide to run it at 12 watts. Yes the IMD is bad at 10 to 12 watts, but on CW it wouldn’t matter. On SSB would the operator choose to give up