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Author Topic: HP 141T Spectrum Analyzer LCD Upgrade  (Read 872 times)

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Offline vk2seb

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HP 141T Spectrum Analyzer LCD Upgrade
« on: July 31, 2017, 09:12:42 PM »
Just a heads up to anyone else who owns one of these ancient 141T Spectrum Analyzer mainframes, I'm working on some firmware for an STM32F7 touchscreen development board to act as an upgrade for the display on it.

At the moment, I have:
- Real-time spectrum display with graticules etc, that works on the slowest up to the fastest timebase
- A waterfall display mode
- A normalization function that makes insertion loss measurements much easier.

Here's a video of it working (lots of other RF stuff too on my channel if you're interested):



Code is available on github (very hacky at the moment): https://github.com/schnommus/stm32_hp141_lcd

Much more work planned for this (want to use all the extra data available on the tracking preselector connector on the back for more features).

I'll post updates in this thread :)
Projects/Teardowns/Reviews @ YouTube Channel, Musings @ SebHolzapfel.com, Callsign: VK2SEB
 

Offline AF6LJ

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #1 on: August 03, 2017, 10:10:11 AM »
This is great, a baseband back end for an old workhouse.
I get a grin when I think of the half dozen PC boards and the 5602 processor in my 8569B that does the same thing. :)
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 

Offline KE5FX

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #2 on: August 03, 2017, 11:14:57 AM »
Very nifty.  What's your bootup time like? 
 

Offline vk2seb

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #3 on: August 03, 2017, 04:55:19 PM »
Quote from: AF6LJ
I get a grin when I think of the half dozen PC boards and the 5602 processor in my 8569B that does the same thing.

Yep, it's ridiculous how much power you can get for a few bucks these days...

Quote from: KE5FX
Very nifty.  What's your bootup time like? 

Code is all bare-metal, no OS so it boots up in a few milliseconds, definitely faster than the old CRT took to warm up.
Waiting for the analyzer LOs etc to warm up to frequency is really the bottleneck though :P.
Projects/Teardowns/Reviews @ YouTube Channel, Musings @ SebHolzapfel.com, Callsign: VK2SEB
 

Offline KE5FX

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #4 on: August 03, 2017, 05:02:55 PM »
Quote from: AF6LJ
I get a grin when I think of the half dozen PC boards and the 5602 processor in my 8569B that does the same thing.

Yep, it's ridiculous how much power you can get for a few bucks these days...

Quote from: KE5FX
Very nifty.  What's your bootup time like? 

Code is all bare-metal, no OS so it boots up in a few milliseconds, definitely faster than the old CRT took to warm up.
Waiting for the analyzer LOs etc to warm up to frequency is really the bottleneck though :P.

Ah, I see.  For some reason I thought you were running Arch Linux on the board at runtime, as well as to host your development environment. 

Do they offer a development kit like that one with a bigger/better LCD?
 

Offline fcb

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #5 on: August 04, 2017, 03:09:45 AM »
Very very cool.

I had a 141T and it was the HEAVIEST piece of kit I ever owned before my Fluke 5215A.

I seem to remember I had the matching tracking generator and it went upto 18GHz!
 

Offline KE5FX

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #6 on: August 05, 2017, 05:42:49 AM »
Just to be sure, this is the board you're using?
 

Offline Jay95

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #7 on: August 05, 2017, 09:09:03 PM »
Nice work!

I knew I shouldn't have given away the 141T that I had  :palm:
 

Offline AF6LJ

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Re: HP 141T Spectrum Analyzer LCD Upgrade
« Reply #8 on: August 07, 2017, 06:35:50 AM »
Very very cool.

I had a 141T and it was the HEAVIEST piece of kit I ever owned before my Fluke 5215A.

I seem to remember I had the matching tracking generator and it went upto 18GHz!
Yes it did.
There was also a preselector you could get also.
Sue AF6LJ
Test Equipment Addict, And Proud Of It.
 


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