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Messages 6636 - 6666 of 44566   Oldest  |  < Older  |  Newer >  |  Newest
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6636 Robert Fincher
robfincher2001 Offline Send Email
Apr 2, 2007
4:26 am
The 1 MHz oscillators in such hoary old gear as the HP5245 counter and the HP5110A synthesiser driver are identical, consisting of a reference quartz...
6637 mojoehand Offline Send Email Apr 2, 2007
6:35 am
Not the same unit, but have a look at this for pointers: http://www.realhamradio.com/GPS-oven-journey.htm ... and the HP5110A synthesiser driver are identical,...
6638 rovmkr Offline Send Email Apr 2, 2007
11:48 am
I wish to buy an A25 Reference Board (p/n 3456-25c or equivalent) for an HP 3456A digital voltmeter. I also need a MC68A00P CPU chip (U15 on the A4 board, or...
6639 rovmkr Offline Send Email Apr 2, 2007
11:56 am
I wish to purchase two circuit boards for the inside of the probes of an HP 8405A Vector Voltmeter. Ones with blown diodes would be OK as long as the circuit...
6640 Robert Fincher
robfincher2001 Offline Send Email
Apr 2, 2007
1:51 pm
Many thanks - man these guys were very thoroughly professional in their approach. ... From: mojoehand <mojoehand@...> To:...
6641 sfisher110 Offline Send Email Apr 2, 2007
2:22 pm
I have a piece of HP equipment labeled: ET 7717 HP Bus Exerciser S/N 02A00030 Does anybody know anything about this? Thanks...
6642 dave_novotny@...
wa6ifi Offline Send Email
Apr 2, 2007
6:10 pm
Is this unit about 2 RU high and half rack wide? Does it have lots of switches on the front panel? I believe this is an HPIB Bus Exerciser that was used in...
6643 Don Collie
doncollie12345 Offline Send Email
Apr 2, 2007
11:50 pm
I have a question to do with my beloved 141T Spec/An. With 0dBm input, and the "Log Reference" knob set to 0dBm beside the light that is lit [the lamp that is...
6644 georgeplhak Offline Send Email Apr 3, 2007
12:33 am
I have one of these beautiful little jems that works perfectly (an HP 6215A), but someone before me dropped it and the plastic rectangular collar that holds...
6645 Peter & Janice Bunge
rovmkr Offline Send Email
Apr 3, 2007
1:55 am
I get a similar low reading. I think if you go through your Performance Tests in the manual you will find you cannot set the Amplitude Calibration for -30 dbm...
6646 Peter & Janice Bunge
rovmkr Offline Send Email
Apr 3, 2007
1:57 am
Do you mean the plastic bezel that holds the meter in place? I may have one. (613) 584-2347 Regards, Peter. ... From: georgeplhak To:...
6647 John Miles
gleamfollower Offline Send Email
Apr 3, 2007
2:06 am
Check connectors between RF and IF sections. Bend fingers toward each other, and/or add extra washers. They all do this, eventually. -- john, KE5FX...
6648 georgeplhak Offline Send Email Apr 3, 2007
2:12 am
Thanks Peter, The one at the other end, the back. George ... have one. (613) 584-2347 Regards, Peter. ... 62XXA...
6649 Chuck Harris
chuck_585a Offline Send Email
Apr 3, 2007
2:15 am
I seem to recall that there is a problem with the 141T system and the sheet aluminum that holds the D style RF connectors that go between the frame and the...
6650 John Miles
gleamfollower Offline Send Email
Apr 3, 2007
2:21 am
Right; those are the connectors I'm talking about. Nasty piece of mechanical-design work, but to be fair, it has worked for a lot of users for a long time. --...
6651 Chuck Harris
chuck_585a Offline Send Email
Apr 3, 2007
3:54 am
... I guess the sad part is virtually every supply or other instrument housed in these "impact resistant" cases is broken. The plastic failed, and shrunk, and...
6652 kc4yoe Offline Send Email Apr 3, 2007
4:42 am
I have a PDF for the manuals but they only have schematics for the power supply. I would like to get complete schematics but particularly looking for the the...
6653 John Miles
gleamfollower Offline Send Email
Apr 3, 2007
4:57 am
You know that secret government warehouse at the end of "Raiders of the Lost Ark"? East wing, aisle 12, fourth shelf. Right next to Nikola Tesla's death ray...
6655 Don Collie
doncollie12345 Offline Send Email
Apr 3, 2007
7:27 am
Thanks for your responses, all. Everybody seems to agree that this is a fault, and not a normal condition, to do with the Amphenol "D" connectors that...
6656 Jos Raven
pa0amx Offline Send Email
Apr 3, 2007
7:54 am
Don, It is definitely not normal for the 8555A, 8552B combo. I just checked my 141T SA system and it is right on spec. 0dB is on the 0dB graticule. That with...
6657 Don Collie
doncollie12345 Offline Send Email
Apr 3, 2007
9:08 am
Can anybody comment on whether or not there is an error in the in the faultfinding flowchart on page 8-12 of the 8555A manual. So far there`s three 141T`s that...
6658 bernd.michael.johann@...
berndjohann67 Offline Send Email
Apr 3, 2007
10:28 am
Hi Don, maybe this is a helpful link for you: http://www.qsl.net/g8bke/141T_mixer.pdf Regards B. Johann, Cologne ... Date: Tue, 03 Apr 2007 11:08:15 +0200 ...
6659 rovmkr Offline Send Email Apr 3, 2007
1:27 pm
I just checked my 8554B and it works the way it should so this seems to rule out my IF section and the mainframe. I am using an 8252A (not the B version) but I...
6660 Glenn Elmore
n6gn Offline Send Email
Apr 3, 2007
1:54 pm
I have the 8753A/B (not C) manual which includes all schematics except the power supply. I think I still have a faded copy of that schematic as well though. ...
6661 Chuck Harris
chuck_585a Offline Send Email
Apr 3, 2007
2:30 pm
That brings to mind a question that was alluded to in a earlier post: What is the result of a burned out 141T SA mixer diode? Burned out mixer diodes are the...
6662 Alan Melia
yhuajm Offline Send Email
Apr 3, 2007
3:16 pm
Hi Peter I actually had a bent pin in one of the Ds in one of my units which stopped the plug and socket mating properly, but that was a 110MHz RF head (8553)...
6663 Geoff Blake
melecerties Offline Send Email
Apr 3, 2007
3:54 pm
... From memory, the 'mixer' in a 8555A comprises a diode transistor pair and if the diode alone fails s/c then the gain drops somewhat (~20dB is possible)...
6664 Chuck Harris
chuck_585a Offline Send Email
Apr 3, 2007
5:09 pm
... I have been informed (off list) that the mixer is a single diode mixer with a transistor IF gain stage following it. A mixer failure of any sort, in this...
6665 rovmkr Offline Send Email Apr 3, 2007
6:38 pm
Hi Don & everyone else, my problem may actually be different from yours - please check and respond. When I vary the input attenuator the peak (from the 8552A...
6666 Bob Spak
wc3p Offline Send Email
Apr 3, 2007
9:46 pm
Ain't it the truth! I wonder why they aren't releasing anything for those units? Bob WC3P ... ...
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