Re: Some suspiciously cheap RF test kit on eBay UK
Modern browsers highlight such fake domains anyway, IIRC. Basically, if any prefix is a valid FQDN with valid https certificate, it¡¯ll get flagged.
Cheers, Kuba
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8 okt. 2018 kl. 12:39 skrev Dave McGuire <mcguire@...>:
On 10/08/2018 12:33 PM, pianovt via Groups.Io wrote:
Dave, I agree that the internet was not meant for e-commerce and really
lacks in terms of security. In this case, the domain name is
3262345523.site
The standard should really not allow any other text in front of the
domain name. It's just asking for a scam. Yes, but "text in front of the domain name" is how subdomains work.
Nearly all large networks use subdomains, sometimes as many has five
levels deep. In the case of the fake web page being discussed,
"www.ebay.com" is a fully legitimate subdomain of domain "3262345523.site".
The problem here is scumbags on one end and people not paying
attention on the other end. Of course, as with anything else, when the
scumbags get better at fooling people, it becomes less our fault and
more their fault, as is what seems to be happening here. I myself would
probably have spotted the fraudulent page, but only because I ran very
large (tens of thousands of domains) DNS servers years ago, and I run a
couple of good-sized ones (hundreds of domains) now. Any other
reasonable person may not notice it at all.
...just like any reasonable person may not notice a modified ATM with
an added card-harvesting fixture, or a scam phone call from the IRS.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: Some suspiciously cheap RF test kit on eBay UK
Well the auction ended. Somebody spend over 970 pounds. Check out the auction bids and tell me if some shill bidding was going on. very weird,
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Re: Some suspiciously cheap RF test kit on eBay UK
On 10/08/2018 12:37 PM, Artekmedia wrote: Number named sites are quite common originating in China for reasons I
can only guess at. Oh, the reasons are quite clear. Schemes like this. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: Some suspiciously cheap RF test kit on eBay UK
On 10/08/2018 12:33 PM, pianovt via Groups.Io wrote: Dave, I agree that the internet was not meant for e-commerce and really
lacks in terms of security. In this case, the domain name is
3262345523.site
The standard should really not allow any other text in front of the
domain name. It's just asking for a scam. Yes, but "text in front of the domain name" is how subdomains work. Nearly all large networks use subdomains, sometimes as many has five levels deep. In the case of the fake web page being discussed, "www.ebay.com" is a fully legitimate subdomain of domain "3262345523.site". The problem here is scumbags on one end and people not paying attention on the other end. Of course, as with anything else, when the scumbags get better at fooling people, it becomes less our fault and more their fault, as is what seems to be happening here. I myself would probably have spotted the fraudulent page, but only because I ran very large (tens of thousands of domains) DNS servers years ago, and I run a couple of good-sized ones (hundreds of domains) now. Any other reasonable person may not notice it at all. ...just like any reasonable person may not notice a modified ATM with an added card-harvesting fixture, or a scam phone call from the IRS. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: Some suspiciously cheap RF test kit on eBay UK
Number named sites are quite common originating in China for reasons I can only guess at.
Dave
manuals@...
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On 10/8/2018 12:33 PM, pianovt via Groups.Io wrote: Dave, I agree that the internet was not meant for e-commerce and really lacks in terms of security. In this case, the domain name is
3262345523.site
The standard should really not allow any other text in front of the domain name. It's just asking for a scam.
Vladan
--
Dave
Manuals@...
www.ArtekManuals.com
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Re: Some suspiciously cheap RF test kit on eBay UK
Dave, I agree that the internet was not meant for e-commerce and really lacks in terms of security. In this case, the domain name is
3262345523.site
The standard should really not allow any other text in front of the domain name. It's just asking for a scam.
Vladan
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Re: Some suspiciously cheap RF test kit on eBay UK
On 10/08/2018 12:09 PM, pianovt via Groups.Io wrote: Aside from the obvious weekend ebay scam, there is something very
disturbing here. I am talking about how well they disguised their web
site URL.
I generally check a URL (at least superficially) before clicking on it.
This URL probably would have fooled me. This kind of a scam could happen
anywhere outside of ebay. For example, they could have set up a phony
Amazon web site using the same method. It looks like it was a really bad
idea to allow URLs with a string of text in front of the domain name. A URL *is* a string of text, adhering to certain conventions, nothing more. There is no way to differentiate what constitutes the domain name other than presenting it to a resolver to execute a DNS query. Remember, this entire thing was designed before we started allowing scumbags access to the Internet. We are now using it for things that it was never designed to be used for. People would do well to keep that in mind as they use it, but of course they won't. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: Some suspiciously cheap RF test kit on eBay UK
Aside from the obvious weekend ebay scam, there is something very disturbing here. I am talking about how well they disguised their web site URL.
I generally check a URL (at least superficially) before clicking on it. This URL probably would have fooled me. This kind of a scam could happen anywhere outside of ebay. For example, they could have set up a phony Amazon web site using the same method. It looks like it was a really bad idea to allow URLs with a string of text in front of the domain name.
Vladan
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HP 8642B develops issues when warming up
When cool this generator powers up with no problems but I notice when I leave it on for about an hour and the internals start to build up heat, symptoms started to occur. The A16 module was flashing on the screen transient failure and when I restarted A19 indicated a test failure. However throughout this the generator was still working. So I let everything cool down for a while and everything runs just fine again, no transient failures or any failed tests, the generator runs like new again when cooled off. Perhaps some capacitors are in question or maybe some IC's or transistors are becoming thermally unstable.
This is similar to the problems I had with a desktop video card, when it would get warm the video would go corrupt and everything would lock up. I attempted the oven trick when I reviewed that others had similar issues and it worked.
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Re: [RSGBTechnical] Some suspiciously cheap RF test kit on eBay UK
Dr. David Kirkby from Kirkby Microwave Ltd
Follow the E-bay link to the seller's shop - it gets odder and odder.
Definitely one to avoid - even though the serial number of the analyser is
clearly visible.
Peter, G3UBX
This seems to be a regular occurrence on high end test kit. I have seen it many times. It usually occurs at a weekend when businesses are closed and so I guess less likely to spot their account has been hacked.?
Once I decided to play along, to see what happened on a Keighley 2002 8.5 digit multimeter. I claimed I would make the bank transfer requested, but could not do it within the 24 hours requested. With that the seller said he sent via FedEx, but would ask FedEx to return if he didn't receive the money. The email had a link that looked like the FedEx website, which showed the parcel in transit, but was clearly not the FedEx website
I "won" the auction for a faulty RF impedance analyzer at ?310
but needless to say I am not going to pay for it. If it was genuine it would be worth getting repaired, but of course it is not genuine.
Dave
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Re: Some suspiciously cheap RF test kit on eBay UK
I reported it to eBay who say they are aware that its a scam, as is pretty much everything else listed under his name. The scam items are all listed as being outside of the USA. As Paul says the genuine seller has posted a note saying that he's been hacked and that unless the listing is for engraving within the US it's a scam.
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Re: Some suspiciously cheap RF test kit on eBay UK
Its a scam - the payment method via external link is the tell.
Seen these many times before.
the buy now method violates eBay laws.
I suggest everyone clicks on the "Report Now" link so it gets removed ASAP.
the same scammer is posting quite a few adds, here's another one...
regards
Tim
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Re: Some suspiciously cheap RF test kit on eBay UK
Try to visit his shop. He says he has been hacked.
Paul G8AQA.
On 08/10/2018 08:58, Dr. David Kirkby
from Kirkby Microwave Ltd wrote:
A 9 GHz Agilent PNA network analyzer for ?2250.?
Note it is running as an auction, but the
auction says that it is buy it now. If anyone is bidding, I
would not send any money without contacting eBay first.
Dave, G8WRB.
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Re: Some suspiciously cheap RF test kit on eBay UK
There are many many items with that modus operandii. A month ago or so many were for HP3458a; frequently the same photo/item was located in multiple continents.
Apart from the point you mention, red flags:
* what has the other vendor sold
* very short term auction
* starting price <?10
* link to a disguised non-ebay site
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On 08/10/18 08:58, Dr. David Kirkby from Kirkby Microwave Ltd wrote: A 9 GHz Agilent PNA network analyzer for ?2250.
Note it is running as an auction, but the auction says that it is buy it now. If anyone is bidding, I would not send any money without contacting eBay first.
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Some suspiciously cheap RF test kit on eBay UK
Dr. David Kirkby from Kirkby Microwave Ltd
A 9 GHz Agilent PNA network analyzer for ?2250.?
Note it is running as an auction, but the auction says that it is buy it now. If anyone is bidding, I would not send any money without contacting eBay first.
Dave, G8WRB.
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Re: HP 8935 E6380A wont power up
Hi all,
I was pointed at the common culprit via Rick@Amtronix.
There are two small vertical PCB's on the main power board, on each of them is a 47uF electro that often fails. Both of mine measured about 12uF. Replacing both brought the unit back to life.
regards
Tim
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On 2/10/2018 7:40 PM, Tim Tuck wrote: Hi all,
My trusty E6380A failed to proceed this morning and preliminary investigations as to the cause prove zip.
Do these things have a common fault I could go look for ?
Any pointers to what might be the cause ?
Any path to resolution gratefully appreciated.
Service manuals don't have schematics so that's not helpful.
thanks
Tim
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Re: 54501 Power Supply Schematic
It was actually a 54503 schematic that helped me with my 54542. ? Joe ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Mark Whitmore
Sent: Sunday, October 07, 2018 11:57 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 54501 Power Supply Schematic? Many thanks to all for the replies.? Several years ago I repaired the same P/S in my 54502A using reverse engineering. brute force, and dumb luck but it took me weeks to do.? Recently the the supply in the 54501 failed and I discovered that it was identical to the 54502 so I swapped them since the 54502 had other problems.? Now I want to get the 54502 going and the P/S is the first step.? I will look at the 54542 schematic that Joe provided and see if it is similar to what I remember of the 54502.? Have not re-caped the sucker but will look into that approach after poking around a little.? The years ago failure turned out the be a shorted rectifier diode supplying the + (or might have been -)? 12 VDC.? I have a vague recollection of these power supplies being manufactured in Ireland or maybe Holland.
Regards,
Mark On 10/7/2018 12:31 PM, Tam Hanna wrote: Hello, not Asian, but Boeschert. ? With best regards Tam Hanna --- ? Enjoy electronics? Join 8300 other followers by visiting the Crazy Electronics Lab at On 07.10.2018 18:23, Artekmedia wrote: Mark? All anticdotal evidence says that the supply was not manufactured by HP but is instead a 3rd party drop ergo no HP schematics were ever released. As near as I can tell It supplies -/+ 5v, +/- 12v (2 buses), +15v, +3.5v. you might try taking it apart and looking for original asian manufacturer and model number and back track it that way. Or even reverse engineering it. The above have produced some results on other HP gear of the 90's era. Dave Artekmanuals On October 7, 2018 at 10:34 AM Mark Whitmore <m.e.whitmore@...> wrote:
I need to fix a dead power supply for my HP 54501.? Is a schematic available anywhere on Earth?
?
?
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Re: Hp 8648C with output level problems
Are you 100% sure it is unstable at all frequencies? I had one output board issue in an 8648C where one of the amps blew in one of the frequency doubler stages and became an attenuator. So it was down above 2GHz iirc.
Colby
On Sat, Oct 6, 2018, 1:36 PM george edmonds via Groups.Io <G6HIG= [email protected]> wrote: Hi Peter
First is the PSU OK for voltage and noise, well known problem with 8648X signal generators
73 George G6HIG
On Saturday, October 6, 2018 8:48 PM, Peter Hansen <oz1lpr@...> wrote:
Hello All I have a Well trusted HP 8648C signal generator I used for many years. It has the high output option (20dBm output). It has now low output around 2-3dBm output maximum and it is not stable in amplitude.
I have ruled out the Attenuator and Reverse power protection. I measure the power direct on the output module.
I heard about Failure of the output MMIC. Can anyone comment on that.
I have seen that MMIC type for sale on Alibaba page. Has anyone ever tried buying that component from them. Is it safe to assume the part is genuine ?
73 Peter OZ1LPR
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Re: 54501 Power Supply Schematic
Many thanks to all for the replies.? Several years ago I repaired
the same P/S in my 54502A using reverse engineering. brute force,
and dumb luck but it took me weeks to do.? Recently the the supply
in the 54501 failed and I discovered that it was identical to the
54502 so I swapped them since the 54502 had other problems.? Now I
want to get the 54502 going and the P/S is the first step.? I will
look at the 54542 schematic that Joe provided and see if it is
similar to what I remember of the 54502.? Have not re-caped the
sucker but will look into that approach after poking around a
little.? The years ago failure turned out the be a shorted rectifier
diode supplying the + (or might have been -)? 12 VDC.? I have a
vague recollection of these power supplies being manufactured in
Ireland or maybe Holland.
Regards,
Mark
On 10/7/2018 12:31 PM, Tam Hanna wrote:
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Hello,
not Asian, but Boeschert.
With best regards
Tam Hanna
---
Enjoy electronics? Join 8300 other followers by visiting the Crazy Electronics Lab at
On 07.10.2018 18:23, Artekmedia
wrote:
Mark?
All anticdotal evidence says that the supply was not
manufactured by HP but is instead a 3rd party drop ergo no HP
schematics were ever released.
As near as I can tell It supplies -/+ 5v, +/- 12v (2 buses),
+15v, +3.5v. you might try taking it apart and looking for
original asian manufacturer and model number and back track it
that way. Or even reverse engineering it. The above have
produced some results on other HP gear of the 90's era.
Dave
Artekmanuals
On October 7, 2018 at 10:34 AM Mark
Whitmore <m.e.whitmore@...>
wrote:
I need to fix a dead power supply for my HP 54501.? Is a
schematic available anywhere on Earth?
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Re: 54501 Power Supply Schematic
What Tam said.
You might even have to unsolder one of the trimpots near the forest of electrolytics to clean under it.? I used the DMM on ohms to check for conductivity between traces - one probe to a pad and drag the other around on the solder resist.? You'll be surprised how far the electrolyte contamination goes, giving readings in the 100s of KOhms to MOhms.? The contamination is invisible.
Here is the list of caps I used:
Index Quantity Part Number Description Customer Reference Available Quantity Backorder Quantity Unit Price USD Extended Price USD 1 14 565-1823-ND CAP ALUM 1000UF 20% 35V RADIAL 14 0 0.81900 11.47 2 2 565-1589-ND CAP ALUM 2200UF 20% 35V RADIAL 2 0 1.49000 2.98 3 1 565-1297-ND CAP ALUM 2200UF 20% 16V RADIAL 1 0 0.83000 0.83 4 3 565-1766-ND CAP ALUM 6800UF 20% 10V RADIAL 3 0 1.76000 5.28
The big primary side caps are probably OK.
The same power supply was used in the 1650B; they were plentiful and cheap on ebay, but such a supply will also die eventually, so you might as well fix the one you have.
There is more information and a hand drawn reverse engineered schematic here:
These supplies were used in many of the 545XX series oscilloscopes as well as at least the 1650B logic analyzer.? You have to search under 54501A, 54502A etc. to find the information.? Mine is a 54510A.
On Sun, Oct 7, 2018 at 7:38 AM Tam Hanna < tamhan@...> wrote:
Did we recap the fucker?
With these Boeschert cartridges, usually you need to gib the caps
first. Then, wash the remaining electrolyte from the top of the
PCB and the bottom, as the creep currents can fuck up the three
terminal regulators.
Tam
With best regards
Tam Hanna
---
Enjoy electronics? Join 8300 other followers by visiting the Crazy Electronics Lab at
On 07.10.2018 16:34, Mark Whitmore
wrote:
I need to fix a dead power supply for my HP 54501.? Is a schematic
available anywhere on Earth?
|
RFI-EMI-GUY
Dave McGuire