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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's

 

soda -> keyboard

On July 12, 2024 5:06:11 PM "Tom Lee" <tomlee@...> wrote:
She must've been very strong...

(sorry, couldn't resist)

On 7/12/2024 10:10 AM, george edmonds via groups.io wrote:
Hi John

Used a wench of Chinese origin


--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Made one out of workshop scrap to enable the correct tightening of SMA 's

 

She must've been very strong...

(sorry, couldn't resist)

On 7/12/2024 10:10 AM, george edmonds via groups.io wrote:
Hi John

Used a wench of Chinese origin
Re: VNA calibration kit to 50 GHz

 

I have an old 85056A that I bought 15 years ago from a company that has never used it since the first day they bought it new from HP. With it I also bought their 8510B 40 GHz that I converted into an 8510C. 20 years ago I had bought an 8510C 26.5 GHz with its 85052B still coming from an other company that was looking to modernize with a PNA.

Up to 26.5 GHz it's possible to do a fairly simple calibration with fixed loads and open and short circuits. But if you want to be precise, it's better to do a full calibration with the same elements plus sliding loads. Then I stocked up on the elements needed for TRL calibrations, but I've never had the courage to use them yet, as they're relatively more complicated.

I also had an 85053A individually calibrated for over $3000 less than 10 years ago at Keysight Roseville (the only place where they know how to do it according to Keysight), so I was able to check several times the difference between with and without sliding loads.

On the other hand, I was able to verify that for 40 GHz, it's really mandatory to use sliding loads because fixed loads aren't good enough to really know what we're doing. That's why I have also one (unfortunately) 2.4mm air line.

I think we should bear in mind that up to 50 GHz this is even truer, and that without sliding loads, without air lines, and without an individually calibrated verification kit (which is almost never the case) to check the result of what we're doing, we can only be in the fog.

For some years now, as I've run out of space, I've stored the two 8510Cs at my country house, and all I have at home is a small (but fantastic) 8720ES.

The 8510C is a slow, impractical instrument, with no computing power, no possibility of storing tons of configurations in internal memory, and no ability to interpolate if the frequency limits are changed. However 8510C is still a very accurate instrument that I was able to compare to several from R&S and HPAK... It's only PNA-X that was better in term of stability along time.

For better verification of all calibration parameters, option 010 is practically mandatory. Fortunately, I have it on all three of my VNAs.

F1EKU.
Re: HP1743A scope

 

I have a todo list of things already very full but I begin to realize that indeed, as you said, it is worth the effort.
Of course all your tips are invaluable Raymond.
As I said I got with the scope, in the pouch, the "Operating and service manual" in an as-new condition. This is maybe silly but it's nearly as much pleasure than the scope itself! Aren't we all nuts?
Thanks,
Renaud
Re: Made one out of workshop scrap to enable the correct tightening of SMA 's

 

We torque our stainless steel SMAs to 8 in-lbs, not 10.

Regarding 5/16 inch wrenches with the slot to slip over coax, Mini-Circuits part number HT-4-SMA is about $37.? Nice knurled handle for good grip, too.? Found one in the lab this morning.? ? HTH.? ? Jim Ford?


On Fri, Jul 12, 2024 at 10:10 AM, george edmonds via groups.io
<G6HIG@...> wrote:
Hi John

Used a wench of Chinese origin, was very lightly case hardened so was possible to drill with a normal HSS drill bit in a battery drill. Would never attempt to do so with one of US manufacture.

I repair a lot of kit that use SMA and SMC connectors and being a nerd I like to torque the connectors up correctly which in the case of SMA is 5 in-lbs for brass ones and 10 in-lbs for stainless steel ones..

G Edmonds

On Friday 12 July 2024 at 16:04:49 BST, John Griessen via groups.io <john@...> wrote:


On 7/12/24 07:13, george edmonds via groups.io wrote:
> Made one out of workshop scrap

Good going!

Did you drill that wrench handle as-is, or after heating and annealing so it drilled more easily?? Or is it not a drill hole I see
there?
Re: How to remove the output cable of the isolator in the 8672A

 

¿ªÔÆÌåÓý

Flare wrench set available from Harbor Freight for <$20. 5/16 should work for SMA.

Just a thought.

On Jul 12, 2024, at 11:41?AM, Erik Kaashoek <erik@...> wrote:

?Its a bit overkill but it may work if there is sufficient space
<inline.0.part>
Re: VNA calibration kit to 50 GHz

 

many thanks for advice, Neil
Re: Made one out of workshop scrap to enable the correct tightening of SMA 's

 

Hi John

Used a wench of Chinese origin, was very lightly case hardened so was possible to drill with a normal HSS drill bit in a battery drill. Would never attempt to do so with one of US manufacture.

I repair a lot of kit that use SMA and SMC connectors and being a nerd I like to torque the connectors up correctly which in the case of SMA is 5 in-lbs for brass ones and 10 in-lbs for stainless steel ones..

G Edmonds

On Friday 12 July 2024 at 16:04:49 BST, John Griessen via groups.io <john@...> wrote:


On 7/12/24 07:13, george edmonds via groups.io wrote:
> Made one out of workshop scrap

Good going!

Did you drill that wrench handle as-is, or after heating and annealing so it drilled more easily?? Or is it not a drill hole I see
there?
Re: VNA calibration kit to 50 GHz

 

I don't think you want to do SOLT calibration at 50GHz with elements that you do not really know a whole lot about.

Get yourself a decent Thru element, an arbitrary (but good mechanical quality) reflect and a few decent 50 Ohms air lines.
Then you can do a TRL cal and you do not have to rely on the quality of reference data. At low frequencies TRM is a good alternative if you have a good low frequency match element.

I have experimented a lot with not very well known cal elements up to 27GHz and TRL was the only way to achieve a decent calibration, not to speak of 50GHz.

Best regards,
Tom
Re: VNA calibration kit to 50 GHz

 

On Fri, 12 Jul 2024 at 12:41, Marcus Gustafsson via <mankan=[email protected]> wrote:
Hi all,

I've have no idea of their quality but these are one of the cheapest I've found that still seems trustworthy.


However I've been looking at 40GHz, 2.92mm connectors and then you can get away even cheaper


Best regards
Marcus

The specifications don't make sense to me.?


VSWR of load < 1.17
VSWR of thru < 1.15
VSWR < 1.065

So what is the last VSWR? I don't see any mention of coefficients, only specs on the open (+/- 6 deg) and short (+/- 4 deg). Normally that would be quoted as some deviation from a model, but that's not stated.


--
Dr David Kirkby Ph.D
Kirkby Microwave Ltd
Email: drkirkby@...
Web:
Telephone 07910 441670 (UK) or +44 7910 441670 (international)
Registered in England and Wales, company number 08914892.?
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT
Re: How to remove the output cable of the isolator in the 8672A

 

Its a bit overkill but it may work if there is sufficient space
Re: Made one out of workshop scrap to enable the correct tightening of SMA 's

 

On 7/12/24 07:13, george edmonds via groups.io wrote:
Made one out of workshop scrap
Good going!

Did you drill that wrench handle as-is, or after heating and annealing so it drilled more easily? Or is it not a drill hole I see there?
Re: HP 8566B - Can my high voltage transformer be faulty?

 

I'll check. I know there was some CRT wiring in the "kit", just not certain if it included the multiplier. We'll find out Sunday when I can get to it.?

Dave Casey?

On Fri, Jul 12, 2024, 1:47 PM Chuck Harris via <cfharris=[email protected]> wrote:
It is mounted on the chassis, and is in the middle of the wire that
goes between the power supply board, and the anode cap of the CRT.

-Chuck Harris


On Fri, 12 Jul 2024 09:16:50 +0200 "Dave Casey" <polara413@...>
wrote:
> I'll check. Is it mounted to the chassis, or is it on a board? Which
> board?
>
> Dave Casey
>
>
Re: HP1743A scope

 

Good luck with it, Renaud. The ¡®scope is worth the effort, especially if you find the differential time / time interval measurement appealing. Let us know how it goes and ask questions!
These ¡®scope are known for bad connectors, broken soldering, defective bridge rectifiers, etc. I haven¡¯t encountered a defective hybrid nor HV multiplier in any family member yet. Also, TO-92 transistors are often broken, I suspect because the mechanical tension from inserting them with their preformed leads causes atmospheric leakage after many years. I¡¯ve encountered as much as 8 or so unrelated failures in one scope.?
Re: HP1743A scope

 

Hello Raymond,
As I said it was just given to me free so I didn't asked about it's state. Then it doesn't work, or possibly I didn't know how to get a trace, I only spent a very short time.
"All 174x-series 'scopes share many components and subsystems, so are quite repairable."
There's still the HP hybrid failed risk maybe? I will investigate when I have more time for that. I got the original paper Ins/service manual in the pocket over the scope. Nice find!
Thanks for the nice report about that little scope Raymond,
Renaud
Re: How to remove the output cable of the isolator in the 8672A

 

Made one out of workshop scrap to enable the correct tightening of SMA 's on a Marconi 2955R The hex shaft fits my toque screw driver. Cost, a bit of MIG welding.

G Edmonds
On Friday 12 July 2024 at 13:46:01 BST, Jim Ford <james.ford@...> wrote:


Erik, check Mini-Circuits for a 5/16 inch wrench with such a slot in it for the coax.? Before you attempt to make your own.? ?Seems like I saw one around here at Raytheon.? Blue anodized aluminum (aluminium for the Brits in the crowd), IIRC.? ? HTH? ? ? ?Jim Ford?


On Thu, Jul 11, 2024 at 10:40 PM, Erik Kaashoek
<erik@...> wrote:
On Thu, Jul 11, 2024 at 06:22 PM, WB2UAQ wrote:
If I remember correctly you need to remove the top, bottom and side covers.? ?Then remove the screws that hold the from panel to the side castings (go in at 45 degrees).? ?I think you can move the entire front panel forward to gain access after removing the knurled nut from the N connector.? We had a 5/16" box wrench for the SMA's that was cut open to slide over the semi-rigid coax.?
Many thanks. This is exactly the information I was (unfortunately) looking for.

Crowfoot1.JPG

Re: How to remove the output cable of the isolator in the 8672A

 

Erik, check Mini-Circuits for a 5/16 inch wrench with such a slot in it for the coax.? Before you attempt to make your own.? ?Seems like I saw one around here at Raytheon.? Blue anodized aluminum (aluminium for the Brits in the crowd), IIRC.? ? HTH? ? ? ?Jim Ford?


On Thu, Jul 11, 2024 at 10:40 PM, Erik Kaashoek
<erik@...> wrote:
On Thu, Jul 11, 2024 at 06:22 PM, WB2UAQ wrote:
If I remember correctly you need to remove the top, bottom and side covers.? ?Then remove the screws that hold the from panel to the side castings (go in at 45 degrees).? ?I think you can move the entire front panel forward to gain access after removing the knurled nut from the N connector.? We had a 5/16" box wrench for the SMA's that was cut open to slide over the semi-rigid coax.?
Many thanks. This is exactly the information I was (unfortunately) looking for.

Re: HP 8566B - Can my high voltage transformer be faulty?

 

It is mounted on the chassis, and is in the middle of the wire that
goes between the power supply board, and the anode cap of the CRT.

-Chuck Harris


On Fri, 12 Jul 2024 09:16:50 +0200 "Dave Casey" <polara413@...>
wrote:
I'll check. Is it mounted to the chassis, or is it on a board? Which
board?

Dave Casey
Re: VNA calibration kit to 50 GHz

 

Hi all,

I've have no idea of their quality but these are one of the cheapest I've found that still seems trustworthy.


However I've been looking at 40GHz, 2.92mm connectors and then you can get away even cheaper


Best regards
Marcus
Re: HP1743A scope

 

- The probe power sockets on the Tek 454 were Sealectro brand.?
- The HP 1740A is from a later era than the Tek 453/454. The contemporary Tek generation was the much lighter 465 family.
- The HP 174X family had discrete (FET) inputs, followed by an HP-specific hybrid.
- The HP 1743A is a very nice family member: The lovely red LED display does not just show *the* delay time ("time base B")
but differential delay (dual delayed sweep!) *and* does not do it the conventional analog way (voltage difference,
like 7B85/7B80 in the Tek 7000 family) but contains a digital counter circuit, resulting in much higher resolution and accuracy,
see HP Journal 1977-12.
All 174x-series 'scopes share many components and subsystems, so are quite repairable.

Raymond
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