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Re: Manual needed for HP 415 series SWR Indicator
dave powis
Hi Mike,
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Thanks very much for the information! I did go to the N6GCE site - but didn't find the pages you have sent the link for! And I totally agree with your comments about the LOGSA site - I gave up after a few attempts. I'll have a look in files area for the service manual - thanks again DAve, G4HUP ----- Original Message ----
From: thermionicguru <mike@...> To: hp_agilent_equipment@... Sent: Thursday, 23 November, 2006 1:00:50 PM Subject: [hp_agilent_equipment] Re: Manual needed for HP 415 series SWR Indicator Hi dave, there is a useful article on usage here:- ites.com/ ~brooke/HP415E. shtml The service manual is available at the US military LOGSA site, but this is a notoriously difficult site to navigate. However, If this is what you need you will find it on this groups files area. Mike G6NCE --- In hp_agilent_equipmen t@yahoogroups. com, dave powis <g4hup@...> wrote: operation and service manuals for the HP 415 SWR Indicators please? Have looked on Agilent, BAMA and various links from those to no avail......
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Re: Manual needed for HP 415 series SWR Indicator
Hi dave, there is a useful article on usage here:-
The service manual is available at the US military LOGSA site, but this is a notoriously difficult site to navigate. However, If this is what you need you will find it on this groups files area. Mike G6NCE --- In hp_agilent_equipment@..., dave powis <g4hup@...> wrote: operation and service manuals for the HP 415 SWR Indicators please? Have looked on Agilent, BAMA and various links from those to no avail......
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8410B
I have an HP 8410B Network Analyzer, which does not appear to work as it should. When putting the unit through the troubleshooting stages as suggested in the manual, I find that the amplitute values quoted in figure 8-51, page 8-51 (circuit board A4) are considerably higher compared to what I get. With an input of 30mV at 20.278Mhz at test point 4, I get 225mV at TP3 (not >0.3V) at TP2 I have 800mV (not >3V) and at the output TP1 I have 400mV (not >2V) I discovered that R15, which according to the circuit diagram should be 100 ohm is in fact 454 ohm, which could explain the differences in gain. I borrowed an A4 board from a friend and discovered that his unit too used 454 ohm and performed identically to mine (i.e. only 400mV out at TP1). Further investigation shows that the model # for my 8410 (and that of my friend) is prefixed 2017A. However the manual I have covers prefixes 1902A and 1941A and 1450A and 1741A with changes mentioned in the "manual changes". It would appear that some significant changes were made in later models making the information I have on hand almost useless.
Question: Can anyone help with a manual for prefix 2017A or later? Cheers, Chris |
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Re: HP608D + HP302A manuals
There's a usable 608D scan on BAMA. Have you checked
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the Agilent site? They have a number of vintage manuals archived, and being that the 608 was one of their longest-running products, I'd be surprised if they didn't have one for it. I can't help you with the 302A. Dave Wise -----Original Message----- |
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Re: 651B Test Oscillator
Don Lewis
Thank you,
Don Lewis, Austin, TX Antonio Falcao <afalcao@...> wrote: --- In hp_agilent_equipment@..., "dlewis157" <dlewis157@...> wrote: Hi, I have made a search on the Parts Info on the Agilent web site. Go to and enter your part number 1855-0082. They have it at US$ 3,95 each, including shipping in the US. Good luck with your 651B repair! Regards, --------------------------------- Sponsored Link Rates near 39yr lows. $510,000 Loan for $1698/mo - Calculate new house payment |
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Re: 651B Test Oscillator (p-channel FET 1855-0082)
Don Lewis
Thank you, ....-Don Lewis, Austin, TX
martin_u_fischer <Martin.Fischer@...> wrote: Hello dlewis157, you can pick this part here: As an interim solution you can use a 2N3820 to reanimate your gear. Check the pinout of this type, however: Have fun Martin U. Fischer --------------------------------- Sponsored Link Mortgage rates near 39yr lows. $510,000 Mortgage for $1,698/mo - Calculate new house payment |
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HP8568B
Chris Bartram
John
?Glad to hear you made some progress. Sounds like the replacement YTO wasThanks for that thought. I can't argue with your logic! I'll try it when I next summon-up the physical strength to lift the analyser off the shelf where it lives! FWIW I did look for a change in loop performance, using the shape of the noise pedestal across the tuning range of the analyser, and it seemed pretty consistent at both of the band edges and at its centre. I didn't have the time or energy to look at the loop using more formal methods... Vy 73 Chris GW4DGU |
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Re: 651B Test Oscillator
Antonio Falcao
--- In hp_agilent_equipment@...,
"dlewis157" <dlewis157@...> wrote: Hi, I have made a search on the Parts Info on the Agilent web site. Go to and enter your part number 1855-0082. They have it at US$ 3,95 each, including shipping in the US. Good luck with your 651B repair! Regards, |
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Re: HP8568B Phase Noise
John Miles
Glad to hear you made some progress. Sounds like the replacement YTO was
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too sensitive (degraded phase margin and increase in loop BW due to increase in overall loop gain), correct? I wonder if the best way to fix that would be a shunt resistance across the tuning coil. There's a lot to be said for not altering the loop filter itself, if possible. It has to work over a rather-wide range of conditions as the analyzer sweeps across the band. -- john, KE5FX -----Original Message----- |
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HP8568B Phase Noise
Chris Bartram
I was able to spend a couple of hours looking at my venerable 8568B this
weekend. After running through the adjustments, and sorting-out some minor alignment issues with the 50MHz VTO and 249/259 synthesisers, the it became clear that the major problem was the tuning sensitivity of the YIG oscillator. This is a replacement part (sourced from a redundant 10MHz - 2.5GHz plug-in for an HP8620, BTW...) This was causing the phase-noise to peak by a few dB at about 150kHz. I was able to reduce the peak, and move the corner frequency back to just below 100kHz by slightly changing the constants of the YTO loop filter. I hope that's of use to somebody else. Incidentally John, KE5FX's phase-noise measurement software was very useful indeed in chasing this problem. Vy 73 Chris GW4DGU |
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Re: NEC D4990AC
Jerry Massengale
Hi John,
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I have bookmarked the alldatasheet location. It was in my searches but buried among the preditors. Thanks. Jerry jbarnes <jbarnes@...> wrote: Jerry Try: It is described as a clock calendar ic with serial output. Regards, John VE3XRY ---------- Original Message ----------------------------------
From: Jerry Massengale <jmassen418@...> Reply-To: hp_agilent_equipment@... Date: Sun, 19 Nov 2006 16:11:42 -0800 (PST) Hi, __________________________________________________________ Sent via the WebMail system at aztec-net.com |
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Re: NEC D4990AC
Jerry
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Try: It is described as a clock calendar ic with serial output. Regards, John VE3XRY ---------- Original Message ----------------------------------
From: Jerry Massengale <jmassen418@...> Reply-To: hp_agilent_equipment@... Date: Sun, 19 Nov 2006 16:11:42 -0800 (PST) Hi, ________________________________________________________________ Sent via the WebMail system at aztec-net.com |
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Re: HP4195A schematics.
Luis Cupido
Thanks Matt,
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I was not aware that we could find obsolete stuff on Agilent's site ;-) .... good :-) Tks. Luis Cupido. ct1dmk. ----- Original Message -----
From: "Matt" <rmc321@...> To: <hp_agilent_equipment@...> Sent: Sunday, November 19, 2006 6:20 AM Subject: [hp_agilent_equipment] Re: HP4195A schematics. Hi Luis, |
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