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Re: HP 5315A modding
Hi Wolfgang, I don't have an HP 5315A, but in my HP 5328A the power switch is wired this way because they want to keep the oscillator running always that the counter is plugged into the mains. This is
By EB4APL · #95615 ·
Re: 5065A rubidium standard parts
Hi, Jan, I have one A10 OSCILLATOR? ?00105-6013. It is totally new, never used and I was keeping it to be used in a future GPSDO that I think that never will materialize. If it happens to be the
By EB4APL · #95614 ·
Re: E4401B No 50MHZ Cal signal
Ok, still I am a bit skeptical that there is an LO problem, The second LO is generated from 800MHz phased locked reference, so I imagine there must be some sort of error message if the LO or the REF
By amirb · #95613 ·
Re: E4401B No 50MHZ Cal signal
Yes, that is at 0dB attenuation, and a +10dBm input signal. It does change with the attenuator setting ¨C it goes down into the noise as I add attenuation. Sadly, there are no connectors in the chain
By Michael Williams · #95612 ·
HP 70590A Information wanted part of HP 70000 / MMS
Hi all Looking for information on a HP 70000 module type HP 70590A apparently it is a test module adapter Any help appreciated Paul B
By Paul Bicknell · #95611 ·
Re: E4401B No 50MHZ Cal signal
That might have been me talking about the "LO Unlock" error. Different problem here. Mark
By Mark Bielman · #95610 ·
Re: E4401B No 50MHZ Cal signal
is that for 0dB attenuator setting? the level should change with attenuator setting. still it doenst necessarily mean you dont have the second LO but it could be one reason for very low IF output is
By amirb · #95609 ·
HP 85044-60001 attenuator - sluggish rotation and imprecise detents
Have an HP 85044-60001 0-70 dB step 10 dB, 4 GHz attenuator (part of 85044A test set). Rotation is more difficult (more torque) than normal, detents are imprecise/mushy (have to hunt a little to get
By David Feldman · #95608 ·
Re: E4401B No 50MHZ Cal signal
You raise a valid point. On that point, I decided to double check the magnitude of the 21.4MHz IF signal coming out of A8J3. It is present, but is around -67 dBm ¨C far lower than it should be.
By Michael Williams · #95607 ·
Re: YTO / HP 5086-7781 & Introduction rehashed (just incase)
What is that YTO used in? And what frequency range? Peter
By Peter Gottlieb · #95606 ·
Re: E4401B No 50MHZ Cal signal
I recall there was some discussion of a problem HP-made HF divider chip in an SA or SG here within the past few months or so. Someone talked about having made a replacement for the chip with modern
By Ed Breya · #95605 ·
Re: E4401B No 50MHZ Cal signal
if you have the second IF out put at correct amplitude the of course your second LO is fine so the only culprits is either the divider chip (800 / 16) or the solid state switch that injects the 50MH
By amirb · #95604 ·
Re: E4401B No 50MHZ Cal signal
It never hurts to double check such things. :-) Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ Sent: Saturday, March 30, 2019 1:42:02 PM To:
By Michael Williams · #95603 ·
Re: E4401B No 50MHZ Cal signal
I asked because I ran into this problem with my E4403B.? There was no cal signal and it didn't not automatically turn on when calibrating.? I found that I had to turn it on manually. Tom
By Tom B · #95602 ·
Re: E4401B No 50MHZ Cal signal
Thanks Tom, Yes, it is turned on. Mike Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ Sent: Saturday, March 30, 2019 1:40:15 PM To: [email protected]
By Michael Williams · #95601 ·
Re: E4401B No 50MHZ Cal signal
Here's how to turn it on from the menu Enable the internal 50 MHz amplitude reference signal as follows: (ESA E4401B and E4411B)Press Input/Output, Amptd Ref(On).
By Tom B · #95600 ·
Re: E4401B No 50MHZ Cal signal
Yeah, This has me scratching my head. Power supplies on a8 look good. Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ Sent: Saturday, March 30, 2019 1:22:52 PM To:
By Michael Williams · #95599 ·
Re: E4401B No 50MHZ Cal signal
Hmmm.. Ok.? -20dbm and 21.7Mhz.? Interesting case of trouble.? Controller / PLL power supplies in check?? Loops locked I guess, thinking what else to check.
By rpoz28cam · #95598 ·
Re: E4401B No 50MHZ Cal signal
Hi Jon, Yes, I see an IF signal coming out of A8J3 when I follow the RF verification procedure when using an *external* 50 MHZ source. The signal does very with attenuation, as describe in the service
By Michael Williams · #95597 ·
Re: E4401B No 50MHZ Cal signal
Mike, Can you see a 21.7Mhz IF signal on the cable plugged into A3J2?? I was looking over pages 55 - 75 of the ESA Service guide for a E4401B and there is a verification process to check on RF deck
By rpoz28cam · #95596 ·
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