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I find it to be a very capable instrument, far superior to the Instek which cost $2500 when new. Hello all, I am a newcomer to your group and like several of you have just purchased the DSA815-TG spectrum analyzer, for me a replacement for a 7+ year-old Instek GSP-810 that I was fortunate enough to be able to sell on eBay for US$1300, greatly subsidising the cost of the DSA815. Now, in terms of actual sampling limitation, the screen may be a non-issue. I ended up purchasing a 6 GHz Agilent since I'm unfamilar with Rigol's long-term after-sale support, and the Agilent does have a slight edge in some performance areas like screen detail where it's XGA, versus SVGA resolution. I went back & forth whether proceed with a used Agilent (N1996A) with nearly identical specs and features - or the Rigol. Looks like a great analyzer but with TG, price is about USD $6K. I looked at the high-end Rigol which has 10 Hz RBW. The Signal Hound is a true direct RF-sampled SDR receiver and is probably better characterized as a narrow-spectrum analyzer. As you go past 200 MHz, the RBW becomes worsens (5 MHz) and the scan time increases more. Beyond 200 kHz, it goes into a special "fast scan" mode that disables the actual I/Q receiver and uses just an IF power detector - good up to 200 MHz (with a 1.5 s scan time.).
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Really falls short if you need a window for wideband measuements greater than about 200 kHz. I looked at it and it would probably do fine for my purposes since it's got good RBW characteristics and I do a lot of experimental oscillator work. Someone earlier mentioned the Signal Hound. This BPF is already get the results,so I can check the performance of DSA815-TG. Anyway,when I receive it,I will measure my homebrew 7MHz BPF(BW 100kHz,-6dB,insertion loss 5.5dB). My concerns is rather Tracking generator's frequency accuracy,whether we can manually change TG's frequency to just center frequency,or TG's frequency is no problem,once calibrating. Usually TG level of SA is from-50dBm to 0dBm. Everybody maybe notice that,TG level is only from -20dBm to 0dBm. If DSA815-TG is no problem,I will release R3361B.It is too heavy.LOL Now,I am waiting for DSA815-TG. Even though R3361B is old one,but it has quasi-peak detector up to 3.6GHz,but I am HAM,so I only use as my hobby experiment. I usually only use R3361B's normal detector,I think it is peak detector. I don't know the difference of noise floor between peak-detector and sample detector,sorry. My R3361B can't set up 0dB attenuation actually.only from 10dB. But,even if the internal attenuator is set up 10dB,almost noise floor is same,because the ordinary SA's IF amplifier automatically compensate it.
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Quote from: swallowtail333 on May 04, 2012, 09:14:12 am This example,Attn 0dB.