The instruments own PN with cross correlation at 28 MHz is -170dBc/Hz at 10kHz offset. It is a remarkable instrument and designed for these kinds of measurements. Look

Um, 51dB (the fractions are imaginary) is not all that good even at 1 kW. It's better than what you can buy today, for the most part. But. it's not very good when 60 dB to 70 dB is

Well I did say at 0dBm! Clearly. It is not my fault that you have PS fan boy eyes. Copnrad

There is an economics pressure here. Who is going to be the first company to give up being price competitive in a small commodity market and will that company survive the hit to its

Mark, I flashed on one of the favorite 6-meter hacks I communicated with. The other ham worked at a military radio repair facility. They had huge bins of 6AC7 receiving pentodes in

On a hunch - run the radio on batteries. That this could be power supply noise modulating one of the stages or (horrors) the D/A converter's reference. (And I sort of wonder what the

Conrad, Good grief! This entire topic of your claims of wildly spectacular IMD3 numbers for your K3S and 890S has nothing to do with tiny amounts of power at 950 MHZ! The radios we're discussing (and

My measurements are from a K3S and TS-890S, with a 2 tone signal at 0dBm from the transverter port. The difference between the 2 fundamental tones is better than 50dB down at the 3rd orders, I will

The Keysite picture was showing the spurs from a Hermes at 28.4 MHz with a 192kHz sample rate using the V1 firmware. it has nothing to do with the IC7300. I have spare time now so I will repost

Hello I never meant to come across as acrimonious, just insistent. The plot is from a Rohde and Swartz FSUP signal source analyser in this

Conrad, I don't understand your numbers at all. A class A amplifier is capable of producing better IMD3 numbers than any other amp, and it is only capable of ~40dBc IMD3. Rob Sherwood says the Collins

Looking at the Keysight picture you posted it's hard to tell the characteristics of the peaks that appear beside the (was it?) 28.4 MHz signal. (The screen notation of 390 kHz is

Um, I am not sure I understand that picture. That is the analyzer's specification or something very custom you have put together? I'm answering both emails here. If that is the

Hello Simon, I had a choice between 6m EME and 6 and 4m with ‘normal’ antennas. I chose 6m EME but I am not so sure it was the right decision after recent storms. I have 6m/4m dual band antenna

Forgot to mention that in high amateur density areas in VHF contests for stations using high power there is a ‘code of conduct’. Perhaps if you have time you may want to watch this

Hi, no it is actually 5 different IC7300s tested by 3 different people, including Rob Sherwood. if you have time you can see the plots and some other data that I posted earlier just do a search. I’m

I suspect your specification is still beyond the state of the art. Is your transmitter that good? It sounds like the 7300 is cleaner than average close in but has some issues

Conrad, 80m SSB DXing has died as death – despite excellent conditions very few people coming on. Are you on 4m – if so I’ll be testing my new legal limit amplifier this afternoon. Simon

You are not painting an attractive picture Simon. However when I get older and maintaining EME antennas gets too much for me. I do always fancy 160 and 80m. Mainly because it appears to be

When I get the opportunity I will check on 80m, I have not checked below 28MHz. On 80m I do not expect the composite noise to any issue due to the much higher noise floor on the low bands. So if you