[Elecraft] SV: Re: K2 Transmitted Phase Noise? (Torsten Clay)

[Samir Popaja]

Look here:

http://www.cliftonlaboratories.com/imd_measurements.htm scroll down to K2/100

or

looke here:

http://www.df9ic.de/tech/trxtest/trxtest.html

"The Elecraft K2 also has a low IF design using conventional VCOs which should result in a good LO noise supression but does not do so well. We had two radios on the bench, one from 1999 (DJ5IR) and one from 2004 (DJ0QZ). This last one was tested on 14 MHz and showed better results than the older one on 28 MHz. You may compare the ARRL test results of the LO noise that Elecraft publishes on their own website and which is closely within our blocking test result (our measured -95 dB RX blocking in 20 kHz offset is equivalent to -129 dBc/Hz LO noise). The high level of TX noise shows that there seem to be design flaws choosing too low signal levels internally. The AGC threshold is ridiculously high (subjective impression). I also do not understand why it uses low quality ladder crystal filters instead of a filter from monolithic duals like other radios does. Overall it was the worst HF radio in the test "

I have also ts-850s and K2/100, hi

Best regards
Samir


>>Kenneth Silverman wrote:
>> 
>> Do K2/100's have a known transmitted phase noise issue?   I looked at the
>> reflector archives, and there was some comment by K6SE (SK) in 2005 that
>> seemed to indicate there was, but the scenario seemed rather specific.
>> 
>
>I used a pair of K2/100's as a SO2R pair for 5 years. I never felt that TX
>>phase noise was a limitation for me. I could listen quite well on other
>bands except near the harmonics of the transmitter. This is at either 100W
>or 1500W level. I have ICE bandpass filters and stubs and most of my
>antennas have reasonable isolation.

>Tor
>N4OGW
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