[Elecraft] K4 standing on Sherwood's RX list

Dave Cole (NK7Z) dave at nk7z.net
Sat Jun 8 20:05:31 EDT 2019


What a nice piece of work Jim, thank you!

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL Asst. Director, NW Division, Technical Resource

On 6/8/19 3:53 PM, Jim Brown wrote:
> On 6/8/2019 3:08 PM, Bob McGraw K4TAX wrote:
>> I do wish he would post transmit IMD numbers.   You might surprised at 
>> the radios that are clean and the radios that are.......well not so 
>> clean.
> 
> There are alternative measurements, done by ARRL as part of their lab 
> tests, that quantify an even more important performance spec -- CW 
> keying bandwidth. Several years ago, after discussions about excessive 
> CW bandwidth at a WRTC, N0AX arranged for me to get ARRL's data in 
> electronic form. I exported that data to a spreadsheet and plotted data 
> for most of the rigs on the same graph. That report is at
> http://k9yc.com/TXNoise.pdf
> 
> I've also done some of my own measurements, using my second K3/P3. The 
> first set of data is at http://k9yc.com/P3_Spectrum_Measurements.pdf A 
> second set of data focuses on the FTDX5000. I measured my neighbor's rig 
> before and after he had loaded Yaesu's "fix" for it's very excessive 
> bandwidth. It's at http://k9yc.com/FTDX5000_Report.pdf
> 
> 73, Jim K9YC
> 
> 
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