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Re: HP 3325A VCO Adjustment - 60MHz?

 

¿ªÔÆÌåÓý

Have you checked at the rear of the instrument, mine has an Auxiliary Output that does 60+ MHz !

2024-04-21 14:48 Tony wrote:

I recently had to replace the A21 board in my 3325A when it developed a fault.

I'm going though the adjustments sections after putting in the new board but hit a snag with the VCO adjustment section in the manual.

it instructs the user in page 5-2 to set the frequency to 60MHz - (see attachment) which must be wrong as the 3325A output range only goes up to 21MHz.

photo-9.jpg

Re: HP 3325A VCO Adjustment - 60MHz?

 

Hi,

The manual is correct. There is an aux output for sine wave only on the rear, which can go up to 60Mhz?and fixed?at some level (0 dBm?) . The primary output only goes to 20 MHz.?

Szabolcs


Tony via <tonycox01=[email protected]> ezt ¨ªrta (id?pont: 2024. ¨¢pr. 21., V, 14:48):

I recently had to replace the A21 board in my 3325A when it developed a fault.

I'm going though the adjustments sections after putting in the new board but hit a snag with the VCO adjustment section in the manual.

it instructs the user in page 5-2 to set the frequency to 60MHz - (see attachment) which must be wrong as the 3325A output range only goes up to 21MHz.

i can¡¯t find an errata in my or other manuals to cover this. Can anybody advise why the correct setting should be?

thanks

tony
HP 3325A VCO Adjustment - 60MHz?

 

I recently had to replace the A21 board in my 3325A when it developed a fault.

I'm going though the adjustments sections after putting in the new board but hit a snag with the VCO adjustment section in the manual.

it instructs the user in page 5-2 to set the frequency to 60MHz - (see attachment) which must be wrong as the 3325A output range only goes up to 21MHz.

i can¡¯t find an errata in my or other manuals to cover this. Can anybody advise why the correct setting should be?

thanks

tony
Re: HP 8568A YTO UNLOCK repair

 

Did some testing this morning, my conclusion are that the YTO FM Coil is very likely to be failed.

After looking at all the test point on the A22 board, i almost sure everything is working fine on that board.

Next to test, is the A9 and A10 with a power meter, if they work perfectly fine, let's go for a YTO.
Re: N9020A

 

The Keysight MXA are interesting spectrum/signal analyzers. I evaluated one about 8 years ago, when it just came out with RTSA option. At the time the firmware that started RTSA mode from sweeping SA mode was a bit weird. If you switched modes, it would default the start/stop/span freq settings and not carry them over from mode to mode. There was a workaround, using some sub menus. I opted to buy a Rohde and Schwarz FSVR7, a 7 GHz SA that had 40 MHz RTSA and would seamlessly switch modes and keep the setting, so you could compare sweeping vs 1024 parallel FFT mode. The FSVR has been very reliable and useful all these years and it is lighter to lift than the M9020A.

Last month I had to buy a new SA for another project at work, and the Keysight N9021B or N9030B are competitive with R&S FSW, their flagship. These all have RSTA options, which I need. I chose 160 MHz RTSA bandwidth that can capture a signal in a few microseconds within that BW. I looked at new and used instruments, as it is difficult to get a new one in less than 2 months right now. I found one instrument from another company that had export controlled RTSA, that would capture high RT bandwidth but could only do it in 15 microseconds. I asked if that option could be removed and the reply was no.

I find surprising that the SSB phase noise of the Keysight MXA still are not up to the level of the R&S. You have to buy options to get it close, whereas the R&S comes without options with superior LO. Why does this matter? If you are using a spectrum analyzer to check oscillators, VCOs, or digital signal processors that generate an RF carrier, you want the test equipment to be at least as good as what you are measuring or better. Otherwise you are just measuring your SA's own source performance. R&S now has the FSWP that is specifically improved to be even better. All of these specs below are with the same test conditions, measured with 10 KHz offset for 1 GHz carrier.

MXA N9020A?? -113 dBc/Hz
MXA? N9021B? -129 dBc/Hz
PXA? N9030B?? -129 dBc/Hz , optional DDS LO gives -134
FSW8???? ? ? -136 dBc/Hz
FSWP???????? -166 dBc/Hz

Everything else was fairly comparable. Another thing to watch for, some of the MXA and the FSVR/FSW are old enough to have Windows 7 embedded. While this is good now, at some point it might become a support problem if you try to put the instrument online. They all seem to have Win10 in current productions.
John
Re: HP proprietary ICs

 

¿ªÔÆÌåÓý

This is why we keep parts units.

Glenn

On 4/20/2024 6:24 AM, howdyrichard wrote:
What are they = expensive! I am currently bringing three 8601A's up to spec and decided to try this company to purchase some misc parts for them. Well, I saw your post and decided to request a quote for your parts. Attached is the quote I just received (yesterday). 

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@...    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
Re: Can anyone recognize this HP Computer? Workstation?

 

Sound great, let me know! And no worries on the VAX memory boards of course. We're pretty well set for most types of VAX memory.

-Dave

On 4/20/24 17:47, Michael A. Terrell wrote:
I'll see if I can get some help to get them out of my storage building I also have an unopebed IOMega 20NB Floptical drive.? A friend wants the National Semicnductor VAX memory boards for his system or I would offer them as well.
On Sat, Apr 20, 2024 at 11:27?AM Dave McGuire via groups.io <> <mcguire@... <mailto:[email protected]>> wrote:
On 4/20/24 04:26, Michael A. Terrell wrote:
> Would you have any use for a pair of Intel Multibuss rackmount
cages?
> There may be some boards in them, I haven't looked at thenm for
20 years.
? ?Yes, we'd definitely give those a home at the museum.
? ? ? ? ? ?-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Can anyone recognize this HP Computer? Workstation?

 

I'll see if I can get some help to get them out of my storage building I also have an unopebed IOMega 20NB Floptical drive.? A friend wants the National Semicnductor VAX memory boards for his system or I would offer them as well.


On Sat, Apr 20, 2024 at 11:27?AM Dave McGuire via <mcguire=[email protected]> wrote:
On 4/20/24 04:26, Michael A. Terrell wrote:
> Would you have any use for a pair of Intel Multibuss rackmount cages?
> There may be some boards in them, I haven't looked at thenm for 20 years.

? ?Yes, we'd definitely give those a home at the museum.

? ? ? ? ? ?-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 8568A YTO UNLOCK repair

 

Thirty Kay,
The RF sections of the 8568 and 8566 are 2 different beasts. There is very little the same in the RF paths. The control, sweep, and tune circuitry is similar in some respects, but different in other respects. Do check the RF block diagrams. This will greatly aid you in troubleshooting your problem.

Don Bitters
Re: still possible to buy manuals from Artek media

 

It seems Gmail is getting worse and worse all the time. :-(

-Dave

On 4/20/24 14:54, Radu Bogdan Dicher wrote:
Mystery solved! The file came as a notification directly from Dropbox, which got filtered?by my email service...
Thanks, Ms. L!
Radu.
On Sat, Apr 20, 2024 at 1:41?AM Adrian Nicol via groups.io <> <Adrian@... <mailto:[email protected]>> wrote:
__
I ordered a manual set for an 8018A a few days ago and got the
download link about 3 hours later
On 20/04/2024 04:08, Radu Bogdan Dicher wrote:
I thought I'd append my recent order to this conversation - I
ordered a manual on their website a few days ago, so not so much
reason for concern yet.
What's the reaction time seen these days to orders?placed on
their?website? I wonder if it'd help if I send an email?...
Radu.


On Mon, Mar 25, 2024 at 2:49?PM Peter Gottlieb <hpnpilot@...
<mailto:hpnpilot@...>> wrote:

I just bought the CLIPs for my 8562E from them.

Peter

On Mar 25, 2024, at 4:13?PM, Peter Hansen <oz1lpr@...
<mailto:oz1lpr@...>> wrote:

?
Hello Are the business still running so it is possible to buy
manuals there ?
best regards Peter
--
Dave McGuire, AK4HZ
New Kensington, PA
Re: still possible to buy manuals from Artek media

 

Mystery solved! The file came as a notification directly from Dropbox, which got filtered?by my email service...?
Thanks, Ms. L!
Radu.?


On Sat, Apr 20, 2024 at 1:41?AM Adrian Nicol via <Adrian=[email protected]> wrote:
I ordered a manual set for an 8018A a few days ago and got the download link about 3 hours later

On 20/04/2024 04:08, Radu Bogdan Dicher wrote:
I thought I'd append my recent order to this conversation - I ordered a manual on their website a few days ago, so not so much reason for concern yet.
What's the reaction time seen these days to orders?placed on their?website? I wonder if it'd help if I send an email?...?
Radu.?


On Mon, Mar 25, 2024 at 2:49?PM Peter Gottlieb <hpnpilot@...> wrote:
I just bought the CLIPs for my 8562E from them.?

Peter

On Mar 25, 2024, at 4:13?PM, Peter Hansen <oz1lpr@...> wrote:

?
Hello Are the business still running so it is possible to buy manuals there ?
best regards Peter
Re: HP proprietary ICs

 

On 4/20/24 13:20, factory wrote:
Don't they realise the quote vastly exceeds the value of the counter? You could buy many working counters for their silly price quote.
The NSN statement on the quote explains it, and indicates the market they're serving. If you need that component to satisfy a military contract, buying a counter on eBay isn't an acceptable way to get one.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP proprietary ICs

 

Don't they realise the quote vastly exceeds the value of the counter? You could buy many working counters for their silly price quote.

David
Re: Re-capping an HP-130 Scopes

 

Variacs do no limit the current, if one of the electrolytics decides to pass a lot of current while reforming, the fuse will hopefully blow instead of burning the transformer winding. There was an axial capacitor that decided to short in mine.

If this is the 130A mentioned in the other thread, it's a 1950s scope, treat it like a unknown condition 1950s TV, lamp limiters are much better for reforming & limiting the current and it'll be obvious if a short suddenly happens. Start with a low wattage lamp and monitor the HT rails, increase the wattage gradually over many hours to bring it up slowly & avoid cooking the capacitors.
Also like an old TV, pull the EHT oscillator valve while working on the lower voltage power supplies & using the lamp limiter, then once the power supplies are functioning properly, start working on the EHT section.

David
Re: N9020A

 

On the other hand, Keysight repair prices often exceed the price to buy another unit surplus.

On 4/19/2024 4:42 PM, F1EKU via groups.io wrote:
If you had a name of a serious seller, it would be a lot easier. Indeed, when you search, there are so many... And most of them only show one photo with no description. So it's impossible to know what options are installed.

On the other hand, I once had the experience of buying a tel N5020A (which I didn't buy), even though it was sold from Korea and had ALL the options installed. Worse still: it went up to 26.5 GHz, whereas according to the serial number (according to my friend at Keysight) it was only a 13.5 GHz model. I was ready to buy it... except that when I asked the seller to provide me with a Keysight verification report with the unit, he told me he couldn't send it to Keysight because all the options and modifications were unofficial.

However, the serial number label on the back of the unit did indeed show 526 and all the other options.

So you need to know: if this type of device breaks down, it won't be possible to get it repaired by Keysight.
Re: Can anyone recognize this HP Computer? Workstation?

 

On 4/20/24 04:26, Michael A. Terrell wrote:
Would you have any use for a pair of Intel Multibuss rackmount cages? There may be some boards in them, I haven't looked at thenm for 20 years.
Yes, we'd definitely give those a home at the museum.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Field test 11970 harmonic mixers

 

Mike

Thank you very much for your reply.

Armed with your practical experience I very cautiously measured my 11970A and obtained 0.72V in got directions. I checked it afterwards and all is well, great sign of relief ;-)

Once again many thanks

73 de G8KHU
Re: 5342A: sometimes counts, sometimes not

 

The 500 MHz - 18 GHz input is the tricky part of the 5342A. I happen to own 2, plus a parts mule in my cellar. The high input range uses HP custom built circuits making repair uncool at best, impossible at worst unless you find a parts mule.

Wilko
Re: Field test 11970 harmonic mixers

 

¿ªÔÆÌåÓý

Dave ¨C I have done exactly what you describe with the DVM in the diode mode on the IF port. Typically, I got close to 0.77 volts in both directions. ?Going to the LO port will not work as it has a BPF in the path. 73 ¨C Mike

?

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

908-902-3831

?

From: [email protected] <[email protected]> On Behalf Of Dave G8KHU
Sent: Saturday, April 20, 2024 3:58 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Field test 11970 harmonic mixers

?

Vewr occasionaly at rallies I've come across 11970 series harmaonic mixers at very good prices - assuming that they are working.....
If they are dead they are a very expensive reminder of caveat emptor :)

Is it safe to field test them with a DVM on the diode test setting measuring the IF output port (and being very careful about static discharge)?

Measuring my DVM it produces 2.3V open circuit and has a short circuit current of 0.8 mA. As the mixer maximum imput level is +20 dBm, and I believe a 4:1 impedance transfor in the waveguide input, that would equate to 100 mW into 200 Ohms giving 4.4 V rms and 22 mA rms. Just looking at the numbers it seems to me that it should be OK - BUT I'd really appreciate the input of those with more knowledge about these mixers that I have.

Dave G8KHU

Re: HP proprietary ICs

 

What are they = expensive! I am currently bringing three 8601A's up to spec and decided to try this company to purchase some misc parts for them. Well, I saw your post and decided to request a quote for your parts. Attached is the quote I just received (yesterday).

RFQNS0935396.pdf
RFQNS0935396.pdf

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