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Re: N9020A
That's known as improving your image!
By Peter Gottlieb · #143777 ·
Re: N9020A
That's almost image amplification! -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu
By Tom Lee · #143776 ·
Re: N9020A
I¡¯d hate to get by without the E4406A, that¡¯s for sure. It sees a lot of use these days looking at L-band signals. But speaking of image rejection¡­ LOL! You get 60-80 dB with the MXA,
By John Miles · #143775 ·
Re: Is it worth looking for a R/3*2 Instrument Controller? - Feedback request
Hi Tony: When I was working many decades ago the cost of any of the HP RMB controllers was very high.? Then Sun came out with a diskless node workstation. HP responded with the 318 Diskless Unix
By Brooke Clarke · #143774 ·
Re: HP 140B LVPS -12.6V Not Working
I would've guessed that the dot marks the collector. At least that was the convention used on all the parts I encountered as a kid. The literature of the day often referred to "the collector dot". But
By Tom Lee · #143773 ·
Re: HP 140B LVPS -12.6V Not Working
The problem is there is no -12.6V. That sits a zero and I can't determine why. There is sufficient voltage at the collector of Q481. If Q481 were open that could cause it. If -12.6V was overloaded,
By n4buq · #143772 ·
Re: HP 140B LVPS -12.6V Not Working
Something about this is confusing me. Looking at the board, the transistors and diodes all have a dot at one lead. I was thinking that dot indicated the emitter and for some transistors, that holds.
By n4buq · #143771 ·
Is it worth looking for a R/3*2 Instrument Controller? - Feedback request
Hey All, I've always wondered if I should try to acquire one of the R/3*2 Instrument Controllers (332, 362, 382) If anyone has one, would you be able to provide some feedback on how you use it and
By Tony Goodhew · #143770 ·
Re: HP 140B LVPS -12.6V Not Working
You should have more than 0.7V across BC of Q484 in normal operation, E is connected to the -12.6V output, B should be approx -12V and C +2V. Another common problem is some of the larger film
By factory · #143769 ·
Re: Agilent E4404B Spectrum Analyzer With Dead PSU Repair
Uh, I've had three go so far just this year. The risk is surely higher in 240V-land, but I strongly advise replacing them on sight here too. -Dave -- Dave McGuire, AK4HZ New
By Dave McGuire · #143768 ·
Re: N9020A
I'm not sure yet. I asked from an ebay seller and got out of focus photos:
By John Griessen · #143767 ·
Re: Agilent E4404B Spectrum Analyzer With Dead PSU Repair
having had quite a few go here in 120 VAC land...if I am in the equipment I replace (or at least remove ) especially if easy access and they are yellow before the stench and mess....I cannot stand the
By Ren¨¦e · #143766 ·
Re: N9020A
So what options should I look for in one of these MXA units? There are so many posts in the thread I can't find the one with the link to the well-optioned units. Peter
By Peter Gottlieb · #143765 ·
Re: N9020A
Some of the aliexpress sellers offer a bare metal MXA without all the options for $150. It could be a parts donor to upgrade an old MXA, but then how to add options?
By John Griessen · #143764 ·
Re: N9020A
The best advice I can offer is to look past the datasheet numbers for the SM435C and look at what is inside the box. It's a low IF receiver that will be prone to image issues just like the little
By jmr · #143763 ·
Re: HP 140B LVPS -12.6V Not Working
Yes, it was regarding the 180A repair. The 2n3904 I replaced has the EBC embossed on the flat and I made sure I placed the new one in correctly. Unlike the one pictured in the foreground, its base
By n4buq · #143761 ·
Re: N9020A
It's difficult to compare the SH to the MXA because the MXA is a classic lab spectrum analyser with the emphasis on achieving low measurement uncertainty and excellent spurious free dynamic range. The
By jmr · #143760 ·
Re: Agilent E4404B Spectrum Analyzer With Dead PSU Repair
Yes, I've bought new RIFA caps to replace the old ones. WIMA and Kemet are two other brands that make the safety rated X and Y caps. But I don't replace old RIFAs on sight anymore. Too much
By Jim Ford · #143759 ·
Re: N9020A
Hi John You are right¡­the top notch versions from signal hound are very impressive ¨CI were referring to their models matching the price---below 2k¡­all have a price .As jeremy points to--- we
By hardyhansendk · #143758 ·
Re: HP 140B LVPS -12.6V Not Working
You might have seen my comments on the eevblog forum and/or the UK vintage radio forum, most recent repair involving the 4-071 was a HP 180A, several got replaced in the PSU, another failed once the
By factory · #143757 ·
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