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Re: HP boxes: direction of air flow
The filter foam is called reticulated foam. It's sometimes sold as fish filter foam (even though that's filtering water) but it doesn't follow that all fish filter foam is usable for air filters. It's
By Adrian Godwin · #140257 ·
Re: HP boxes: direction of air flow
The filter foam is called reticulated foam. It's sometimes sold as fish filter foam (even though that's filtering water) but it doesn't follow that all fish filter foam is usable for air filters. It's
By Adrian Godwin · #140256 ·
Re: HP boxes: direction of air flow
You can buy it on Ebay, and from industrial suppliers. wrote:
By Michael A. Terrell · #140255 ·
Re: Some 3458A questions
I did extensive numerical studies and found I could invert the 1D heat equation for multiple flows such that the prediction accuracy was 1-2% error for a period equal to the recorded data. That
By Reginald Beardsley · #140254 ·
Re: HP11729C 640 MHz magic cable?
Hi Robin, I built such a cable. As you said output is 11dBm-13dBm, input is 1dBm-4dBm level. Cable needs to provide ~ 9dB attenuation so that the output after going through attenuator provides >=1dBm
By Ozan · #140253 ·
Re: HP boxes: direction of air flow
Probably because the filter material degraded with age and fell apart; then was not replaced. Can¡¯t suggest where to get it or what alternatives there might be. It may also have a slight benefit in
By Tom via Metronet · #140252 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
Thanks to all. I did not expect nor rely upon WD-40. Kroil ordered arrives on the 20th. Appreciate the recommendations re the knob and, unless Kroil or other method to extract the set screw is
By k6whp · #140251 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
Kroil, or Kano Kroil, is a very good penetrating oil that has been around for decades. If the knob is Bakelite or other material that will not melt, turn the setscrew hole upward, put a couple drops
By greenboxmaven · #140250 ·
HP11729C 640 MHz magic cable?
Hi, I have an HP 11729B that looks an anwful lot more like an 11729C, complete with the 640 MHz input (BNC) and output (SMA) ... as you may know you can apparently link these two together to use an
By Robin Szemeti · #140249 ·
Re: HP boxes: direction of air flow
Indeed, the dust filter is a good argument. My box only has a finger grid, though, no dust filter, but lots of dust inside... Tom
By tom_iphi · #140248 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
FWIW, somebody on this group or the Tek group recommended a product called Kroil a while back. I bought some to try on a couple things I knew were going to be impossible to unscrew - and it worked
By Steve Hendrix · #140247 ·
Re: HP boxes: direction of air flow
It is quite common for the casing to have ¡®positive¡¯ pressure in order to keep any foreign bodies out unless they are filtered through Any grille/filter foam mesh etc. HIH Regards Nigel
By nigel adams · #140246 ·
Re: HP boxes: direction of air flow
Hello Tom, Normally outside in as far as I know. The fan will not blow against a dust filter, will it? Cheers, Harke
By Harke Smits · #140245 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
Hi William, Been there, done that -- but IMHO WD-40 is not the best choice. Its main use is a water repellent. I would do this : - Try to get any grease, etc ... out of the thread with a little IPA
By Joel Setton · #140244 ·
HP boxes: direction of air flow
Hi folks, is there a general rule for HP boxes with fan how the airflow is routed? Does the fan blow air into the box or suck it out of the box? I have a 8517 with missing fan, so I need to
By tom_iphi · #140243 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
Unfortunatly the pot with switch has been discontinued by Bourns. Last one I repaired I managed to make one up using a switched pot of the wrong resistance value and the resistance track off a 470k
By Robert G8RPI · #140242 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
William, on the buggered setscrew, I will relate what has worked for me - occasionally! I grab a piece of hard steel, like the tang of a small file or - my favorite - one of the old-style square cut
By n4ua · #140241 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
Hi William, You may have to sacrifice the pot by carefully sawing the shaft off, then the frozen knob can possibly be worked on in a more accessible location to prevent risk of front panel damage.
By nigel adams · #140240 ·
Re: HP 5315A With Destroyed Gate Pot and "frozen" Frozen Knob
Did that with no success. Thanks. -- William, k6whp -------------------- "Cheer up, things could get worse. So I cheered up and things got worse."
By k6whp · #140239 ·
Re: Cheap and simple OXCOs upgrades on ebay
As Matt says, I shouldn¡¯t engage, but that rarely stops me. This is one of those uncommon arguments where everybody has at least one good point. ? The original TimePod 5330A was introduced in
By John Miles · #140238 ·
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