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Re: Troubleshooting and repairing a 7704A instrument
Most RF transistors, and RF front ends, have a limited voltage input tolerance. Running DC into a spectrum analyzer generally kills the front end, because of the DC. To prevent that, people tend
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Most RF transistors, and RF front ends, have a limited voltage input tolerance. Running DC into a spectrum analyzer generally kills the front end, because of the DC. To prevent that, people tend
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By
Harvey White
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#166690
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Re: Troubleshooting and repairing a 7704A instrument
Thank you Greg, Raymond for your teaching of 7L13 precautions.
It will take me a good while of studying the details of the RF, microwave circuits, attenuators, filters, mixers, oscillators and other
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Thank you Greg, Raymond for your teaching of 7L13 precautions.
It will take me a good while of studying the details of the RF, microwave circuits, attenuators, filters, mixers, oscillators and other
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By
Ernesto
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#166689
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Re: R561B rectangular trace, I'm baffled, please help
OK, data
The +300 and +125 rails are at spec with 5mV and 3mV ripple respectively.
The -12 and -100 rails are a little over at 3 and 4mV respectively. The spec is 2.
Interestingly, the ripple I
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OK, data
The +300 and +125 rails are at spec with 5mV and 3mV ripple respectively.
The -12 and -100 rails are a little over at 3 and 4mV respectively. The spec is 2.
Interestingly, the ripple I
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By
WastelandTek
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#166688
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Re: Troubleshooting and repairing a 7704A instrument
Good to know, Greg.
At the risk of taking this further off-topic (but to an area that may be of interest to many on this group), what about areas like Southern California where I live that have very
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Good to know, Greg.
At the risk of taking this further off-topic (but to an area that may be of interest to many on this group), what about areas like Southern California where I live that have very
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By
Jim Ford
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#166687
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Re: Tek 5440
I have converted 2 5000 series scopes to the rackmount form factor.
It is not hard, you have to fabricate a couple simple parts if you don't have a donor unit going the other way, and it requires a
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I have converted 2 5000 series scopes to the rackmount form factor.
It is not hard, you have to fabricate a couple simple parts if you don't have a donor unit going the other way, and it requires a
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By
WastelandTek
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#166686
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Re: Tek 5440
TekWiki says 5100 series plug-ins will go into 5400 series mainframes but not vice-versa. Never tried it myself, since I only have a 5100 mainframe. JimSent from my Verizon, Samsung Galaxy
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TekWiki says 5100 series plug-ins will go into 5400 series mainframes but not vice-versa. Never tried it myself, since I only have a 5100 mainframe. JimSent from my Verizon, Samsung Galaxy
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By
Jim Ford
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#166685
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Re: 496 looses the magic smoke
So, Dave, how did "RipVan Analyzer" do on the interference hunting field trip?
I used to have a 496. Then I got a 494P, then others. I think the Tek 490 series are outstanding instruments but
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So, Dave, how did "RipVan Analyzer" do on the interference hunting field trip?
I used to have a 496. Then I got a 494P, then others. I think the Tek 490 series are outstanding instruments but
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By
nj902
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#166684
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Re: 2465B post-recap issues.
Disconnected the GPIB option and the 2465B is back working like a champ.
Thanks for pointing me in the direction of the option, not the logic main
board.
I know for a fact I will never need GPIB on
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Disconnected the GPIB option and the 2465B is back working like a champ.
Thanks for pointing me in the direction of the option, not the logic main
board.
I know for a fact I will never need GPIB on
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By
Andy Warner
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#166683
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Re: Troubleshooting and repairing a 7704A instrument
Thanks for this extensive explanation, Greg.
You've done well pointing out explicitly that DC blocks won't help to protect the SA's input against anything else than a >0V DC voltage, hence the name DC
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Thanks for this extensive explanation, Greg.
You've done well pointing out explicitly that DC blocks won't help to protect the SA's input against anything else than a >0V DC voltage, hence the name DC
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By
Raymond Domp Frank
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#166682
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Re: Troubleshooting and repairing a 7704A instrument
A note on connecting test equipment (namely spectrum analyzers) to an outdoor antenna.
There is little that can save an instrument from external environmental electrical effects (mostly static) that
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A note on connecting test equipment (namely spectrum analyzers) to an outdoor antenna.
There is little that can save an instrument from external environmental electrical effects (mostly static) that
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By
Greg Muir
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#166681
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Re: Another miserable tantalum!
The same with the small caps in the 7A22 plugin, which I incorrectly thought were regular aluminum electrolytics, are also Kermet tantalum.
I assume that these axial-lead sealed tantalums are less
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The same with the small caps in the 7A22 plugin, which I incorrectly thought were regular aluminum electrolytics, are also Kermet tantalum.
I assume that these axial-lead sealed tantalums are less
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By
Ernesto
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#166680
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Re: Another miserable tantalum!
Dave, you are right.
On closer inspection, two of the small caps which I thought were aluminum electrolytics, are Kermet tantalum capacitors, like C95 and another one, I guess.
I also realized
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Dave, you are right.
On closer inspection, two of the small caps which I thought were aluminum electrolytics, are Kermet tantalum capacitors, like C95 and another one, I guess.
I also realized
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By
Ernesto
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#166679
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Re: Tek 5440
From what I understand, the 5000 series is good to 1 or 2 Mhz, the 5400 series is good to 60. However, the 5400 series plugins do not fit into the 5000 series frames, nor do the 5000 series fit in
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From what I understand, the 5000 series is good to 1 or 2 Mhz, the 5400 series is good to 60. However, the 5400 series plugins do not fit into the 5000 series frames, nor do the 5000 series fit in
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By
Harvey White
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#166678
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Re: Tek 5440
Also, Ron, you will want to know that the 5400 series can use plug-ins up to 60 MHz bandwidth, but if you use the 5A1*, 5A2*, and/or 5B1* plug-ins, the BW will be limited to 1-2 MHz. That may be a
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Also, Ron, you will want to know that the 5400 series can use plug-ins up to 60 MHz bandwidth, but if you use the 5A1*, 5A2*, and/or 5B1* plug-ins, the BW will be limited to 1-2 MHz. That may be a
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By
Jim Ford
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#166677
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Re: Which type of transistor is SG503 Q190 151-0614-00?
Interesting John,
Now there clearly is a distinction between MRF511 and the later type. In both my SG503s the measured resistance between E1 and E2 is simply the sum of both external emitter
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Interesting John,
Now there clearly is a distinction between MRF511 and the later type. In both my SG503s the measured resistance between E1 and E2 is simply the sum of both external emitter
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By
Albert Otten
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#166676
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Re: Which type of transistor is SG503 Q190 151-0614-00?
Hi, Albert.
I don't know about discrete RF Darlingtons, but Avantek (bought by HP, spun out as Avago Technologies and then merged with Broadcom) used to have RF amplifiers based on the Darlington
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Hi, Albert.
I don't know about discrete RF Darlingtons, but Avantek (bought by HP, spun out as Avago Technologies and then merged with Broadcom) used to have RF amplifiers based on the Darlington
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By
Jim Ford
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#166675
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Re: Troubleshooting and repairing a 7704A instrument
Even without thunderstorms, I guess static charges could build up and threaten your SA. Others probably have more experience with this, I always avoid straight-through antennas in my SA experiments.
I
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Even without thunderstorms, I guess static charges could build up and threaten your SA. Others probably have more experience with this, I always avoid straight-through antennas in my SA experiments.
I
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By
Raymond Domp Frank
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#166674
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Re: 496 looses the magic smoke
that will be quite alright, lol
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that will be quite alright, lol
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By
WastelandTek
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#166673
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Re: Another miserable tantalum!
Some of the axial-lead caps (the ones I was referring to) in my 1A4 are hermetically sealed, a packaging technology often used with tantalum but not aluminum. If you can find a hermetically-sealed
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Some of the axial-lead caps (the ones I was referring to) in my 1A4 are hermetically sealed, a packaging technology often used with tantalum but not aluminum. If you can find a hermetically-sealed
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By
Dave Wise
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#166672
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Re: Troubleshooting and repairing a 7704A instrument
Raymond, thank you for the warning. I will be extra careful.
Maybe I will connect to the 7L13 my outdoors TV antenna (on a day without thunderstorms).
Not the DSL signal from the cable internet,
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Raymond, thank you for the warning. I will be extra careful.
Maybe I will connect to the 7L13 my outdoors TV antenna (on a day without thunderstorms).
Not the DSL signal from the cable internet,
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By
Ernesto
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#166671
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