But as others have mentioned just the SA is only the start, cabling, adapters, attenuators, loads, and directional couplers can soak up a heap more funds to become even moderately well equipped.
But as others have mentioned just the SA is only the start, cabling, adapters, attenuators, loads, and directional couplers can soak up a heap more funds to become even moderately well equipped.
+1 , beware of these accessories which personally I called "RF plumbing stuffs", top brand ones even used can still quite pricey. In my case, as I got my SA pretty cheap (posted at used SA guide too), these overall plumbing stuffs even at minimal, cost almost the same as my SA.
Depends on the SA acquired, suggesting to start learn/look/lurk for these stuffs too apart from the SA, cause sometimes this activity alone will take quite sometimes & energy to accumulate, let alone the cost.
As tautech pointed above, my suggestion for starting point sorted by priority imo : sacrificial connector, DC block (if needed) .. various attenuators ... and so on ...
Just an example of small portion part of the plumbing stuffs, these used things alone cost > 50 bucks ..
Hmm, good point. Additionally, I thought Tek oscilloscope probes were expensive till I saw the prices that even old HP RF probes go for too.
Hmm, good point. Additionally, I thought Tek oscilloscope probes were expensive till I saw the prices that even old HP RF probes go for too.
LOL ... I can see you've seen and opened a nasty can of worm, arent you ?
Yep, those high freq GHz range RF probes are pricey, trust me, I've lurked and waited patiently for years, and finally able to grab one at decent price. Its a HP 54701A 2.5GHz active probe, aged > 3 decades , complete with it's "accessories", emphasized on the word "accessories" as at above few hundreds of MHz, probing technique and accessories becomes really matter, plain probe alone won't cut it, say compared like using passive probe. So take note on this tiny matter if you plan to buy an used one.
I have similar situation as you, as hobbyist, my best scope is Tek 2465B too, which is max at 400MHz as you aware of. Below photo quoted from your post from other 2465B thread if you don't mind, as signal above 400Mhz will be attenuated, coupled with a RF probe + a SA + correct probing technique & tools, I've been acquiring signals that I've never been able to see and measure with decent accuracy before.
As only hobbyist, I'm content and find this situation is a decent & reasonable compromise, rather than buying GHz capable scope which is overkill, at least for me.
Yeah...it's one hell of a can of worms. No worries on the photo; definitely illustrative of your point. I might have missed it above, what what SA do you run?
Looks like that model of probe is actually within reach pricewise...I was finding newer ones than that in the $3-5000 range (or more) and they were STILL old.
Yeah...it's one hell of a can of worms. No worries on the photo; definitely illustrative of your point. I might have missed it above, what what SA do you run?
Looks like that model of probe is actually within reach pricewise...I was finding newer ones than that in the $3-5000 range (or more) and they were STILL old.
Its not widely known, a Korean made called Nex1 NS-30 9KHz-3GHz, posted the detail in the "Used SA guide" too, the OP didn't update it in the list, click here -> Nex1 NS-30 , 9KHz-3GHz & photos
1) What are reasonable prices in 2018 to be paying for working HP "big iron" SAs such as 8566, 8568? Some of the ones I'm seeing on ebay seem to be very highly priced considering their age, even considering the instrument cost as much as a nice car or even a house new.
IMHO the old SAs from HP are way overprized. These are also very old and their specs are not as good as modern gear. Other brands like Anritsu and Advantest also make very good spectrum analysers and good deals can be found on Ebay if you have a little bit of patience.
1) What are reasonable prices in 2018 to be paying for working HP "big iron" SAs such as 8566, 8568? Some of the ones I'm seeing on ebay seem to be very highly priced considering their age, even considering the instrument cost as much as a nice car or even a house new.IMHO the old SAs from HP are way overprized. These are also very old and their specs are not as good as modern gear. Other brands like Anritsu and Advantest also make very good spectrum analysers and good deals can be found on Ebay if you have a little bit of patience.
IMHO the old SAs from HP are way overprized. These are also very old and their specs are not as good as modern gear. Other brands like Anritsu and Advantest also make very good spectrum analysers and good deals can be found on Ebay if you have a little bit of patience.But I'd have to get a mortgage to afford a new one with similar capabilities, so there's no free lunch. I'm keeping my eyes open and I'm not in a hurry to buy anything just yet.
I am curious which specs exactly are not as good?
IMHO the old SAs from HP are way overprized. These are also very old and their specs are not as good as modern gear. Other brands like Anritsu and Advantest also make very good spectrum analysers and good deals can be found on Ebay if you have a little bit of patience.
You don't need a mortgage. For less than $2000 you can buy very nice used gear from Advantest or Anritsu for example.
Looking at the datasheet for the HP 8568, a more modern instrument would have....
Lower DANL, spurious harmonics, level accuracy uncertainty, RBW options, VBW options
And better sweep speed
number of points in sweep
timebase spectral purity and phase noise
Even with a 10Hz RBW (instead of 1Hz with averaging to get best results), the DANL of either the Rigol or the Siglent is lower than the 8568A can even display according to specification, the sweep has many more measurement points and is still very fast, the timebase has lower phase noise, etc.
The best advice is really to buy something cheap and see what limitations you encounter with it, then use that insight to decide what to get next. You don't want to be the guy who buys the most expensive guitar in the store before you take your first lesson.
Oh, one more thing....
I had a conversation with calibration/repair technician and he mentioned that:
If you go outside of HP/Agilent/whatevernext, parts availability and documentation availability can suffer. For HP, owner's manual, technical manual, repair guide, tuning guide, etc, are readily available. Parts show up often on eBay. Not so for other brands. Many Japanese makes did not release their manuals to public like HP did, and parts are almost non-existent. You'll end up needing to do a parts level repair without much of guides. This is why I stay with HP and Tektronix. Everything is SO available. Being an old stuff, they will need maintenance. Before you make a decision, my recommendation is to look to online resources to see what you can get, parts and manual wise.
I may have found a deal on a 8569B that the seller says works, actually. I think I understand from the buyer's guide that the 856X is always better in RF performance than other models. I don't think it has as low RBW as the big boys, but it could be fun for a first one.
I may have found a deal on a 8569B that the seller says works, actually. I think I understand from the buyer's guide that the 856X is always better in RF performance than other models. I don't think it has as low RBW as the big boys, but it could be fun for a first one.
At the right price, sure. It's less capable than either the huge benchtop analyzers or the newer portables, so the price should be lower as well.
Repairability is definitely always a plus. I have found PDF of the 8569B operators and service manuals online already.
Artem Manuals is a great resource for quality scans of old manuals. KO4BB is also outstanding.
TonyG
The best advice is really to buy something cheap and see what limitations you encounter with it, then use that insight to decide what to get next. You don't want to be the guy who buys the most expensive guitar in the store before you take your first lesson.
I may have found a deal on a 8569B that the seller says works, actually. I think I understand from the buyer's guide that the 856X is always better in RF performance than other models. I don't think it has as low RBW as the big boys, but it could be fun for a first one.
The best advice is really to buy something cheap and see what limitations you encounter with it, then use that insight to decide what to get next. You don't want to be the guy who buys the most expensive guitar in the store before you take your first lesson.
I may have found a deal on a 8569B that the seller says works, actually. I think I understand from the buyer's guide that the 856X is always better in RF performance than other models. I don't think it has as low RBW as the big boys, but it could be fun for a first one.
Check carefully that all front panel adjustments works 100% and not just intermittently or some step not at all. It is real nightmare if they are not in good condition. If it need repair it really need know how to do and then even more importantly, what must not do. (there is available quite good instructions for repair - service work)
Years ago I have owned one of this SA (yes it was nearly like "new")
This front panel is this SA's "Achilles heel" if it is handled using "heavy hand". Also there is some plastic parts what may break even without touching just due to some material ageing.
Here is one example what I mean is "Achilles heel"
(I think some years in history HP use this construction in many places. It can ask what they smoke these years there)
Thanks for the heads-up! At least it's fixable. TBH if the deal works out the price is low enough I'm not too worried.