TA-0403: Racal 9918 Frequency Counter Repair 1 - Test and Debug
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- čas přidán 23. 08. 2024
- Racal 9918 from 1975 , Finding the bug with the schematic and test the quick fix.
in Part 2, after receiving the parts the proper repair and cleanup.
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#dana #racal #9918
Excellent. Nice piece of equipment. Hopefully an easy fix once the parts arrive :)
Thanks, yes lets see.
Nice bit of fault finding there Tony
Thanks George! ..
Nice old counter, made when I was just starting school :o Made in UK too. Looking forward to part 2.
Glad you enjoyed it!
Thanks for another interesting video... 👍👏😻
Thank you too!
Very nice work! You make it look easy.
Thank you, i was luckey teh service manual was very good in explaning the signal path... must admit first time i seriously read one also :)
reading them makes your life more easy then staring at the scematic and trying to find out. or Racal was just very good in describing.
I just bought its cousin, the 9919. It has a smaller case but does read to 1 GHz.
That made my set, with the RF Generator, Two-Tone Generator, and this Freq. Counter. All were made during the same time period, and look similar. I have a 5003 bench DMM as well.
Thanks, yeah they make great stuff!!
@@TonyAlbus If you can ever obtain the 9082 RF generator, I think you would like it. It's AM and FM up to 540 MHz, and digital, but has the look of an analog, much like the old HP 8640B. However, where HP tuned theirs mechanically, the 9082 is tuned by an encoder, and it tunes like a newer ham rig. The main tuner is like a spinner knob on a rig, and it flies. You also have a fine tune that's easy to use.
The generator also has an OCXO, and if I remember, it has the coarse and fine-tuning on it. Mine, like yours, though, is connected to an external 10 MHz satellite standard.
The 9082's counter is limited, though, to six digits, like the 8640B, so you really need an external counter.
You can find a video about the 9082 on here, titled: RACAL DANA 9082 SIGNAL GENERATOR.
@@TonyAlbus I told you wrong on the 9082's counter, it's eight digit. I just went into my shop and looked.
@@craxd1 Thanks!!
Nice work, Tony! I saw that discolored tant when you first showed the Phillips chip and shouted "Shorted tant" at the screen but you didn't hear me 😂. Probably the tant shorted and took out the transistor. Regards, David
Thank you David... i think the screaming helped, we found the problem, thanks for your help, and comment
Thanks for the mention😃
No problem, it was a good help.
I see lots of red dipped tantalum caps, I expect you will find at least one that is shorted, whenever I see the red ones I definitely see red… make sure the main power supply has very low ripple to try to prevent the tantalums blowing up.
Thanks, so the red ones are the worse... will do that extra check on the psu caps..
I've made space for dim-bulb box at work area to be used for all new-old equipment. I'll use it until I have some confidence there will be no catastrophe. I feel I've just been rolling the dice by relying on a finger close to the power switch for that smoke making fault.
Yes that bulb trick is used a lot in the valve/tubes community, great idea.
@@TonyAlbus I don't use VT's much, but I'm wary of those old capacitors.
Those Philips OM modules are easily replaced with a modern MMIC chip. The Philips modules were extremely unreliable and noisy too, but were used in many devices back then.
Yes for the Marconi are kits available with MAR-3SM chips... i talk about it in the video and left links in the description
ciekawy miernik i ma wzorzec ocxo to ważne by dokładnie pracował. Jaka max częstotliwość jest jego ? Widzę że ma miejsce na rozbudowę.
Yes seems very stable indeed, it goes upto 680 MHz, but i think we can push it a bit more, i will try when it is fixed, to see what is the max.
I have an HP frequency counter on my lab bench i have not used in a decade. Just not a piece of equipment that brings value to what I do. If I need frequency I use my scope measure. If I need a counter I use my scope search. Maybe I might need to count something over a few days and I might use it again one day or I may never power that thing up again but I do now and then enjoy pushing those hp break away buttons.
The HP counter are nice too, you will find a few in my videos too.