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You can export the plot to csv and than in excel do the recalculation of the frequency values.
November 11, 2015 at 11:35 am in reply to: BB60c + TG44 in SNA mode resets Store Tru calibration every 2 minutes!
Hello Andrew, thanks for reply.
Warm up can be a temporary solution, but I hope you will fix this in some time.
No, when I change div setting it does reset my calibration.
Also I’ve noticed, when I remember several traces (I tune antenna, or compare several antennas with directional coupler) and switch analisys to VSVR mode, only last trace is recalculated from dBm to VSVR. As a result, I can’t compare antennas both in dBm view and in VSVR view without redoing all measurements again.
I’ve checked TG44 output against its 10MHz ref ouput on oscilloscope.
When I set tg44 output to 10MHz or 20MHz, it generates sine phase locked with reference (frequencies matches exactly). But 30MHz, 50MHz, 100MHz are not in phase and have some frequency deviation. For example, to generate exact 10x phase locked output I have to set tg44 freq=99.999970MHzAs I understand, instead of tuning internal tg44 reference generator to exact 10MHz, you simply set some freq correction parameter into it. This makes useless it’s 10MHz output.
As for me, I don’t want to see untriggered data, because it quickly erases useful triggered event and fills screen with useless garbage.
Almost every oscilloscope has 3 trigger modes – Normal, Auto and Single. I think it’s good to have all 3 variants of operation in Spike (it has only 2 now, Single and Auto).
By the way, i think Spike should have Stop button (it should be near Single button). To freese aquiring and let me see and analyze captured data. Single button can’t help here, because it will erase my data (found event could not happen anymore).
Hi,
I’ve attached my application with source code (written with MS Studio 2010). Feel free to use it as you need.Button Sweep starts the sweep from start to end frequency.
Button “Set” sets fixed frequency and power.Frequency boxes recognize mnemonics like “4g4”, “100m1” or “10k” mnemonics to set frequency in GHz, Mhz or KHz.
Thank you for the answers.
I see in specs, that TG44 can output power from -10dBm to -30dBm, and it does so (and even a bit more), there’s no issues here. But software sometimes makes me puzzled, it shows me that TG44 is capable to output 0..-40dBm power and 0..13GHz frequency. I think it’s good to reflect in the software realistic abilities of the connected generator.
I was expecting to see rectangular output of the tracking generator (as it do some other analyzers), and sine output on low range was a little bonus to me.
Regards, Ivan
3. I’ve connected TG44 and my function generator (Rigol DG4162, which allows me to set amplitude in dBm from +10 to -50), set both generators to 1MHz and compared output amplitude. I see, that TG44 power -10dBm, -20dbm, -30dBm look correct (+-1dbc error), -40 is -38dBm (a bit higher, but still ok) but 0dBm outputs only -7dBm. On picture yellow line is TG44 output (Vrms =100mV, ~-7dBm), blue line is DG4162 output (Vrms =232mV, close to 0dBm). On -20dB picture both show almost identical Vrms ~22mV. Is it a hardware issue?
4. I see that TG44 generates 10MHz output reference, but it can’t use external (OCXO or GPSDO) reference. It’s looks strange to use external reference in analyzer and not being able to use the same reference in generator.
