Re: Mounting HP Iron in 19" Racks
This is not directly related to the topic, but our local HAM club has at least three full size racks we need to get rid of.? This is the Anne Arundel Amateur Radio club in Davidsonville, MD.
Drop me a note if you're interested and I'll put you in touch with the right person.
Jim Simpson
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Re: Mounting HP Iron in 19" Racks
All of my 19" racks have mounting holes front and back, as usual, but also have mounting holes on the sides as well. I drill pieces of 1-1/2" aluminum angle to fit the mounting holes on the side when the 19" instrument lines up with an appropriate set of holes on the front. Then, you can just slide the instrument onto the full depth angle slides, and you can also use the screw holes in the front panel for added security. The aluminum angles easily handle a couple of hundred pounds each pair. The heaviest thing I have mounted that way is a FLUKE linear amplifier, 5205A. It weighs a cool 120lbs. -Chuck Harris On Sat, 30 Mar 2024 17:28:24 -0400 "Peter Gottlieb" <hpnpilot@...> wrote: I use equipment shelves that only mount from the front, but the one
you show is better mechanically.? Where do you get them?? Do you have
a part number?
Pter
On 3/30/2024 5:23 PM, Dave Miller wrote:
I have run out of floor and bench space and it's time start filling
up the racks I have stored away. :-(
Unfortunately most of the equipment does not have mounting ears.
Last time I looked at them they are hard to find and very expensive.
What's everyone thoughts about using 4 post ventilated shelves like
this?
They are rated 120 kg a shelf.
I can source them locally cheaper and faster than a set out
mounting ears on Fleabay with shipping. And I can adjust the height
instead of getting multiple sizes of ears.
It's also easier to wrestle something on a shelf than mount it in a
rack with screws. Or at least that is my limited experience.
And If I want put another piece in rack it seems easier.
What do the experts have to say?
Thanks
Dave
VE7HR
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Re: Mounting HP Iron in 19" Racks
Angles from old bed frames. Brilliant! I need some and never thought of those and they're indeed ubiquitous!
Thanks,
Barry - N4BUQ
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I used to do this with scrounged angle iron from bed frames people would throw
out on trash day.? Some are pretty wide and I can attest to the wood strip
method to keep things centered.? A sawzall makes quick work of cutting them.
Peter
On 3/30/2024 7:10 PM, Ed Breya via groups.io wrote:
I have a bunch of fairly heavy aluminum 90 degree angle-iron pieces scrounged
up long ago. They are about 2" by 3/16" flats by 30" long, and easy to drill
holes anywhere and attach with the usual 10-32 screws into the side members of
almost any rack. Usually it's enough to just support the side rails of the
gear firmly, from front to back. I put the heaviest items on the rails, and
stack lighter gear on them, so only a few big items are actually mounted, and
serve as shelves for the rest. It's easier to reconfigure too, unless you need
to relocate the big stuff.
So, you don't really need a shelf pan, but be sure the gear can't move too far
side to side and fall through. The wide enough angle stock mostly assures
this. I drop in wooden shims on the sides if there's any doubt. Also be sure
the rack is stout enough to not bow open - sometimes you need cross pieces
here and there to hold the sides together
Ed
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Re: Mounting HP Iron in 19" Racks
I used to do this with scrounged angle iron from bed frames people would throw out on trash day.? Some are pretty wide and I can attest to the wood strip method to keep things centered.? A sawzall makes quick work of cutting them.
Peter
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Show quoted text
On 3/30/2024 7:10 PM, Ed Breya via groups.io wrote: I have a bunch of fairly heavy aluminum 90 degree angle-iron pieces scrounged up long ago. They are about 2" by 3/16" flats by 30" long, and easy to drill holes anywhere and attach with the usual 10-32 screws into the side members of almost any rack. Usually it's enough to just support the side rails of the gear firmly, from front to back. I put the heaviest items on the rails, and stack lighter gear on them, so only a few big items are actually mounted, and serve as shelves for the rest. It's easier to reconfigure too, unless you need to relocate the big stuff.
So, you don't really need a shelf pan, but be sure the gear can't move too far side to side and fall through. The wide enough angle stock mostly assures this. I drop in wooden shims on the sides if there's any doubt. Also be sure the rack is stout enough to not bow open - sometimes you need cross pieces here and there to hold the sides together
Ed
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Re: HP-1421A Q109 Voltages
I got a chance to test the circuit just a bit.? I placed a 47k resistor between the base of Q109 and ground.? That caused the lamp to illuminate so the transistor is still good.? I just need to determine why the base voltage is being held at or below the emitter voltage.
Thanks,
Barry - N4BUQ
That's what I kept thinking - especially since everything else that's connected to the base is negative.? Could that be a typo? Barry - N4BUQ -8.8V seems much more plausible, with the emitter -9.4V Hugh Gilbert
On Fri, Mar 29, 2024 at 4:02?PM n4buq < n4buq@...> wrote: Chuck,
Thank you so much for that.? I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +.
Thanks again,
Barry - N4BUQ
----- Original Message -----
> From: "ChuckA" <chuck@...>
> To: "HP-Agilent-Keysight-equipment" <[email protected]>
> Sent: Friday, March 29, 2024 2:38:15 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] HP-1421A Q109 Voltages
> Here's a clean scan of the section you are looking at.
>
> ChuckA
>
> On 3/29/2024 3:16 PM, n4buq wrote:
>> Does anyone have a readable schematic for the A101 board in a 1421A?? I have a
>> paper manual on order but until that arrives, I would appreciate finding out
>> the voltages shown for Q109 (Page 5-16, Figure 5-9).? From what I can tell, the
>> online scan appears to show:
>>
>> C: +48V
>> B: -8.8V
>> E: -9.4V
>>
>> The value for B is particularly blurry but would like to know for sure what all
>> of those are.
>>
>> Thanks,
>> Barry - N4BUQ
>>
>>
>>
>>
>>
>>
>
> --
> See Early TV at:
>
>
>
>
>
>
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Re: Mounting HP Iron in 19" Racks
The cantilever shelves work great. Especially for the smaller stuff, like putting two 1/2 width units together.
I have used a lot of Navepoint stuff in the past. This is an option that I like for 3U-4U type boxes.?
They also sell the cantilever style shelves and the sturdier 4-post type shelves (sliding and static styles). Of course, looks like their prices are up since I bought from them last. Always worthwhile to keep an eye on fleabay for cheap lots.
-Michael Bierlein
On Sat, Mar 30, 2024 at 19:51 Dave Daniel < kc0wjn@...> wrote: I've been using these (from Amazon) for years. They work pretty well:
AC Infinity Vented Cantilever 2U Universal Rack Shelf, 16" Deep, for 19¡± equipment racks. Heavy-Duty 2.4mm Cold Rolled Steel, 100lbs Capacity.?
DaveD On Mar 30, 2024, at 17:23, Dave Miller <ve7hr@...> wrote:
?I have run out of floor and bench space and it's time start filling up the racks I have stored away. :-( Unfortunately most of the equipment does not have mounting ears. Last time I looked at them they are hard to find and very expensive. What's everyone thoughts about using 4 post ventilated shelves like this? <dummyfile.0.part> They are rated 120 kg a shelf. I can source them locally cheaper and faster than a set out mounting ears on Fleabay with shipping. And I can adjust the height instead of getting multiple sizes of ears. It's also easier to wrestle something on a shelf than mount it in a rack with screws. Or at least that is my limited experience. And If I want put another piece in rack it seems easier. What do the experts have to say? Thanks Dave? VE7HR
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Re: HP8560a smoke came out
Rifa caps are not happy with high voltages.? Could you adjust your solar panel inverter to only 240 volts?
Harvey
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On 3/30/2024 6:51 PM, glenn percy via groups.io wrote: Thanks Henning re *delta marker*. Been a while since I operated this SA. I just confirmed thats the level issue.
Re *the cap across the mains*, that's what i suspected initially as I had it happen on other? HP test gear. Getting to that area though appears very difficult to confirm that's all it is.
The mains voltage here can rise to over 250v on a sunny day, as I have solar panels on the roof.
Glenn
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Re: Mounting HP Iron in 19" Racks
I've been using these (from Amazon) for years. They work pretty well:
AC Infinity Vented Cantilever 2U Universal Rack Shelf, 16" Deep, for 19¡± equipment racks. Heavy-Duty 2.4mm Cold Rolled Steel, 100lbs Capacity.?
https://a.co/d/09Sckik
DaveD
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Show quoted text
On Mar 30, 2024, at 17:23, Dave Miller <ve7hr@...> wrote:
?I have run out of floor and bench space and it's time start filling up the racks I have stored away. :-( Unfortunately most of the equipment does not have mounting ears. Last time I looked at them they are hard to find and very expensive. What's everyone thoughts about using 4 post ventilated shelves like this? <dummyfile.0.part> They are rated 120 kg a shelf. I can source them locally cheaper and faster than a set out mounting ears on Fleabay with shipping. And I can adjust the height instead of getting multiple sizes of ears. It's also easier to wrestle something on a shelf than mount it in a rack with screws. Or at least that is my limited experience. And If I want put another piece in rack it seems easier. What do the experts have to say? Thanks Dave? VE7HR
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Re: Mounting HP Iron in 19" Racks
This is a better solution than mounting
ears.
It is probable that the ears alone will not properly support the
weight of the gear.
Glenn
On 3/30/2024 5:23 PM, Dave Miller
wrote:
I have run out of floor and bench space and it's time start
filling up the racks I have stored away. :-(
Unfortunately most of the equipment does not have mounting ears.
Last time I looked at them they are hard to find and very
expensive.
What's everyone thoughts about using 4 post ventilated shelves
like this?
They are rated 120 kg a shelf.
I can source them locally cheaper and faster than a set out
mounting ears on Fleabay with shipping. And I can adjust the
height instead of getting multiple sizes of ears.
It's also easier to wrestle something on a shelf than mount it in
a rack with screws. Or at least that is my limited experience.
And If I want put another piece in rack it seems easier.
What do the experts have to say?
Thanks
Dave?
VE7HR
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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Re: HP8560a smoke came out
Thanks Henning re delta marker. Been a while since I operated this SA. I just confirmed thats the level issue.
Re the cap across the mains, that's what i suspected initially as I had it happen on other? HP test gear.? Getting to that area though appears very difficult to confirm that's all it is.
The mains voltage here can rise to over 250v on a sunny day, as I have solar panels on the roof.
Glenn
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Re: Mounting HP Iron in 19" Racks
Forgot to mention, most gear should not be mounted only by the front ears or flanges - only the very lightest and shortest (front to back) items are safe this way. Sides and back support is needed for the typical big old gear. Use judgement, and think about the vector forces on everything.
Ed
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Re: Mounting HP Iron in 19" Racks
I have a bunch of fairly heavy aluminum 90 degree angle-iron pieces scrounged up long ago. They are about 2" by 3/16" flats by 30" long, and easy to drill holes anywhere and attach with the usual 10-32 screws into the side members of almost any rack. Usually it's enough to just support the side rails of the gear firmly, from front to back. I put the heaviest items on the rails, and stack lighter gear on them, so only a few big items are actually mounted, and serve as shelves for the rest. It's easier to reconfigure too, unless you need to relocate the big stuff.
So, you don't really need a shelf pan, but be sure the gear can't move too far side to side and fall through. The wide enough angle stock mostly assures this. I drop in wooden shims on the sides if there's any doubt. Also be sure the rack is stout enough to not bow open - sometimes you need cross pieces here and there to hold the sides together
Ed
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Re: Mounting HP Iron in 19" Racks
I have some of the front mount shelves but the cheap?ones won't?support the?nice HP iron. They?deflect too much. That picture was for the Mainframe?SRS-4-F. I can get them at my local supplier in Vancouver?BC. So it's?an offshore import. You can find?ones that are similar on Amazon but prices seem much higher. I think I will grab?a couple to test out. Dave VE7HR
On Sat, Mar 30, 2024 at 2:28?PM Peter Gottlieb < hpnpilot@...> wrote: I use equipment shelves that only mount from the front, but the one you show is
better mechanically.? Where do you get them?? Do you have a part number?
Pter
On 3/30/2024 5:23 PM, Dave Miller wrote:
> I have run out of floor and bench space and it's time start filling up the
> racks I have stored away. :-(
> Unfortunately most of the equipment does not have mounting ears. Last time I
> looked at them they are hard to find and very expensive.
> What's everyone thoughts about using 4 post ventilated shelves like this?
>
>
> They are rated 120 kg a shelf.
> I can source them locally cheaper and faster than a set out mounting ears on
> Fleabay with shipping. And I can adjust the height instead of getting multiple
> sizes of ears.
> It's also easier to wrestle something on a shelf than mount it in a rack with
> screws. Or at least that is my limited experience.
> And If I want put another piece in rack it seems easier.
> What do the experts have to say?
> Thanks
> Dave
> VE7HR
>
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Re: Mounting HP Iron in 19" Racks
I use equipment shelves that only mount from the front, but the one you show is better mechanically.? Where do you get them?? Do you have a part number?
Pter
toggle quoted message
Show quoted text
On 3/30/2024 5:23 PM, Dave Miller wrote: I have run out of floor and bench space and it's time start filling up the racks I have stored away. :-(
Unfortunately most of the equipment does not have mounting ears. Last time I looked at them they are hard to find and very expensive.
What's everyone thoughts about using 4 post ventilated shelves like this?
They are rated 120 kg a shelf.
I can source them locally cheaper and faster than a set out mounting ears on Fleabay with shipping. And I can adjust the height instead of getting multiple sizes of ears.
It's also easier to wrestle something on a shelf than mount it in a rack with screws. Or at least that is my limited experience.
And If I want put another piece in rack it seems easier.
What do the experts have to say?
Thanks
Dave
VE7HR
|
Mounting HP Iron in 19" Racks
I have run out of floor and bench space and it's time start filling up the racks I have stored away. :-( Unfortunately most of the equipment does not have mounting ears. Last time I looked at them they are hard to find and very expensive. What's everyone thoughts about using 4 post ventilated shelves like this?  They are rated 120 kg a shelf. I can source them locally cheaper and faster than a set out mounting ears on Fleabay with shipping. And I can adjust the height instead of getting multiple sizes of ears. It's also easier to wrestle something on a shelf than mount it in a rack with screws. Or at least that is my limited experience. And If I want put another piece in rack it seems easier. What do the experts have to say? Thanks Dave? VE7HR
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Re: HP 427A no DC offset adj. pot
It's a later one with the Rev B A2 board 00427-66512, connection pin 5 is also gone, the diode relabelled as CR2 (was CR1) goes directly from pin 8 to pin 11. Original A2 board is 00427-66502.
David
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Hello I am trying to get a 8720ES working. It has a CPU board fault. The CPU board start some but not fully.
I get an error saying:
Please stand by- Error INST
This error I cannot find info on anywhere. Maybe someone can help me ?
best regards Peter
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Re: HP8560a smoke came out
Glenn,
You have activated the delta marker function, so what is shown if the "normal marker" function is activated?
My first idea on the big bang was an exploding RIFA cap on the AC mains input. Did You check this?
73
Henning Weddig
DK5LV
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Re: HP 427A no DC offset adj. pot
Probably so Paul. ?I do wonder if the lack of manuals for this particular version of the 427A is because it was a military/govt. version that is just now being phased out. ?Agree on the beat up surplus. ?I just looked at a couple of pieces up for auction too rough for me. ?I will say however, over the past two years I've picked up a HP 8601A that had been stored in a hermetically sealed bag, a Sencore SC-61 O'scope that was literally new/unused in its original box (probes and all), as well as a Boonton 92EA and Sencore LC-53 that were in great shape. ?Maybe between here and over at antiqueradios someone will come through with a manual for this version.
Leon...
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Re: HP 427A no DC offset adj. pot
Leon I did look at the other site great pix and thats a nice looking meter. Normally gov stuff is pretty beat up. Suggestion. If the meter is off as little as you say does it make sense to simply use the meter mechanical zero to get rid of it? Paul
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