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Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
According to the CLIP the A4 assembly is the Log Amp and Cal assembly. J3,J4,J5,J7 and J8 are 50 Ohm SMB connectors according to the parts list. I have not identified the EXACT designation of the RED SMB coaxial lead in question yet. I'll have a look next weekend.
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Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
Lothar baier
¿ªÔÆÌåÓýA few comments on SMB connectors :SMB is a push on RF connector that is a cousin of the SMC connector both are identical except of the SMC being screw on.
SMB was designed as a miniature RF connector for internal wiring , it is normally used with RG174,188 and 316 cables but there are also versions that accommodate 0.086 hardline.
Frequency rating is -4GHz although in testing equipment it¡¯s usually used below 1GHz mostly for IF or sweep signals .
The biggest concern with SMB is that like most push ons they are leaky and tend to develop reliability issues over time as the leaf springs holding the connector in place tend to lose tension.
On May 29, 2022, at 13:23, David via groups.io <david@...> wrote:
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Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
¿ªÔÆÌåÓýWhat is the signal involved? HP often used SMB for DC bias or things like RF detector outputs when they just wanted a well screened cable. If that is the case here then a slightly squidged cable is not a problem (assuming it still has continuity and isn't shorted of course!)On 29/05/2022 18:58, David wrote:
Thank you for your replies so far. |
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Re: HP 8116A woes with E42 error
I did check the supplies. Sorry I forgot to mention that. If I remember correctly the +15 V supply was off, and it wasn't off by much. It was in the millivolts range if I recall. I was able to get that back into range with no trouble.It didn't catch me off guard as I would expect these to drift out of range slightly over time.
I will double check these values again this evening before I move on to recapping a Monsanto 101A counter. Like this nixie tube counter too. Pretty neato. Thanks, David |
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Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
Hi David ? SMB connectors are not normally used in high frequency RF or critical circuits so a little cable damage may not matter. ? To remove an SMB pull on the sleeve nearest the matting connector as they are a latch fitting. ? G Edmonds |
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Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
Thank you for your replies so far.
Please find attached a photo of the connectors and the damaged coax cable (Red). If I was to buy cable it is important to buy the correct type so that it's the correct impedance and also so that it fits any connector properly. I hope you can help me further. Thanks |
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Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
Lothar baier
¿ªÔÆÌåÓýThere is no such thing as a push on SMA , the connector you are referring to is more than likely a SMB connector which are common in HP equipment to connect IF and low frequency signal lines, crimp tools you can find on ebay and the cables and connectors you can get at digi key , mouser, newark or similar places but you can find the cables are common and you can find them on ebay?On May 29, 2022, at 11:51, David via groups.io <david@...> wrote:
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Re: HP 8116A woes with E42 error
¿ªÔÆÌåÓýDid you check the supplies? You mentioned checking a bunch of stuff, but not that. I've fixed a couple of these (I think), and the problem was simply a bad negative supply, if I recall correctly. In any case, check supplies if you haven't already.--Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 On 5/29/2022 08:59, Swiss via groups.io
wrote:
Hello everyone. |
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HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
I am reassembling my HP8563E SA and I have found a red coaxial cable (approx 2.7mm diameter) that connects to the A4 PCB that has compression damage to the insulation. It has a right angle push on type SMA connector. I don't have the exact length measured yet, and I need to confirm if it has continuity. However, ideally I would like to replace the cable if possible. The problem is I do not have the tooling available to make a cable up myself. Is a crimping tool available for a reasonable price? If so, which one? What is the type of coaxial cable used? Are these right angled push on SMA connectors still available and if so does anyone have a part number and supplier information they can share. Is there anywhere in UK/Europe I can get a single cable made up? Or does anyone have a spare cable they don't need? Thanks.
David, Hemel Hempstead UK. |
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HP 8116A woes with E42 error
Hello everyone.
Long time lurker / never poster. Waned to see if anyone may have some ideas on an issue that I am having with an 8116A? function generator. The output of the unit slowly started to become distorted over the last year in every waveform form mode. The distortion would come and go. Intermittent so to speak. One day it would work fine, and the next it would be unusable. It looks like it has finally broken, still comes good every now and then, but it seems to be in a consistent failure mode now. I've followed the troubleshooting steps in the service manual starting in 10.4. The results are as follows: The output at test point 4 is not distorted below 999 mV. I also checked the pins on U401, pin 18 and pin 19 and all looks well according to the manual. Once I increase the amplitude above 1.00Vp-p, TP 4 starts to become distorted for both the triangle and square waveforms. Amplitude - vernier control voltage is within spec. I removed U401 to reseat it just to make sure there wasn't a bad connection there. Checked the current at pin16 and measured 2.366 mA. 2.5 mA is what it is spec'd for. The current mirror on the output of U401 (Q401A and Q401B) is what concerns me the most. The measurements are as follows: With the unit set @ 4.00V? amplitude output: (I can't find the datasheet on this matched pair, so I don't know if I have the naming convention correct below) The tab on the can is pointing to the right <-- as modeled by MAT01, or MAT03 matched PNP. ? C(2)? ? ? ?|? ? B(2)? ? ?|? ? ?E(2) 3.1090 V? ?3.9568 V? ? 4.7701 V? ? C(1)? ? ? ?|? ? B(1)? ? ?|? ? ?E(1) 3.8617 V? ?3.9564 V? ? 4.7746 V? @ 999mV ? C(2)? ? ? ?|? ? B(2)? ? ?|? ? ?E(2) 3.1081 V? ?3.9626 V? ? 4.7722 V ? C(1)? ? ? ?|? ? B(1)? ? ?|? ? ?E(1) 3.8625 V? ?3.9626 V? ? 4.7766 V The offset-vernier control-voltage is slightly out of spec for the negative side. Although I don't think this is my issue, however it might be related. WIth offset set to -5.00 V, I measured 3.3122 Vdc. This is 62 mV out of spec. WIth offset set to -7.00 V, I measured 2.0840 Vdc. This is 34 mV out of spec. I diode checked all the output transistors from Q501 to Q513 and didn't see any usual values. No shorts or opens. Just some caps charging. I also checked the A2 board for offset control and the DACs and didn't find anything out of sorts there either. When switching from 999mV to 1.00V, it seems that the reed switches K2 and K3 are the only ones that change. If any of the circuits were pulling down the signal at TP4, I would suspect the issue to be on K3. However, the main output from the front panel is still distorted regardless of the reed switch positions. The unit has no negative offset control. Only positive offset control. I can add the full positive DC offset, and the signal will rise above ground and the waveform will not be distorted. Looks nice and clean above ground reference. I do have another good working 8116A that I could use to compare measurements from, but i'd rather not probe around in it unless I really have too. I want to try and keep this unit as I like the 8116A. Don't want to turn it into a parts machine unless I have too. So I guess my question is, should I try to replace Q401, or is it possible that the issue could be else where. Was wondering if someone here had experience with these units, and if there are any common failure points with this error. Sorry that I made this so long. Thanks for the help, David |
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Re: LackRack
On Sun, May 29, 2022 at 03:51 AM, Bill Higdon wrote:
It's a little known fact that we have seen Google engineers tinker with Lack tables since way back in 2009." https://wiki.eth0.nl/index.php/LackRackYes... yes it is! I'm not saying I have enough style to avoid this; but, I don't smoke as much of that stuff as some Google engineers might (whatever a Google engineer might be.) Fortunately, equipment racks turn up here, and Ikea is far away. |
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Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
Dr. Kirkby: " You will need to slow the sweep speed down, below that automatically chosen for you. Otherwise the frequency of the oscillator will have shifted outside the passband of the receiver by the time it gets back to the receiver. This is well documented in one of the HP Application notes"
----------- Attached is an example. |
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LackRack
This might be an interesting idea for small rack mounts
"The LackRack is the ultimate, low-cost, high shininess solution for your modular datacenter-in-the-living-room. Featuring the (side table) from Ikea, the LackRack is an easy-to-implement, exact-fit datacenter building block. It's a little known fact that we have seen Google engineers tinker with Lack tables since way back in 2009." https://wiki.eth0.nl/index.php/LackRack |
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Re: 53181A 3 GHz prescaler from China
I saw a clock multiplier module on eBay the item number is 362887003547
- P1: Input Port (Input 2~50MHz, Minimum Input Voltage 100mVp-p) SMA Interface. - P2: Output Port (Maximum 150MHz) SMA Interface - P3: Power Supply Port (3.3V~5V) Configurable for 2x, 3x, 4x, 5x, 6x, 8x, and some others Might be useful for getting 40 MHz from 10 MHz for your applcation. I was thinking to try this to get 40MHz from 10MHz ref for ADI Pluto SDR module. I purchased one but have not tried it yet. I have no connection to the seller. -Eric Haskell ? ? |
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Re: HP8640B no rf out
If I'm not mistaken, these fingers are the same ones that are on those disks: https://www.ebay.com/itm/125225534497 Thanks, Barry - N4BUQ From: "Tom Lee" <tomlee@...> If you are unable to find exact replacements, many have successfully improvised substitutes. I've used the contact fingers from cast-off solderless breadboards and Lothar's method of screwing them down. They don't look pretty, but they work fine. |
Eric Haskell [KC4YOE]
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