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- Просмотров 9 308 613
moviestudioland
Добавлен 14 янв 2012
Here you can see movies taken with consumer level Digital Cameras
National company HRO 500 replaced sawtooth detector, diode and coupling capacitor
Update from THE FUTURE. Wed Aug 28th.
I tuned the Two IF cans and the MIXER can on the SYNTH for best LOCK on band #3
Meaning I would turn the synth tune one way until it unlocked. Then the other way to lock.
Then further until it unlocked.
Then I fiddled with the Mixer and the two IF cans to get the WIDEST lock possible spanning the desired frequency. This seems to be the BEST way to turn the mixer and the two IF cans
After this and hours later I fired up the HRO 500 and could LOCK on all bands 1 to 5.
Although not accurately on bands 1 and 2.
indeed I have all of the frequency indicator drum OUT to change the light bulbs STILL!
=================================================================
Se...
I tuned the Two IF cans and the MIXER can on the SYNTH for best LOCK on band #3
Meaning I would turn the synth tune one way until it unlocked. Then the other way to lock.
Then further until it unlocked.
Then I fiddled with the Mixer and the two IF cans to get the WIDEST lock possible spanning the desired frequency. This seems to be the BEST way to turn the mixer and the two IF cans
After this and hours later I fired up the HRO 500 and could LOCK on all bands 1 to 5.
Although not accurately on bands 1 and 2.
indeed I have all of the frequency indicator drum OUT to change the light bulbs STILL!
=================================================================
Se...
Просмотров: 24
Видео
National company HRO 500 replaced germanium diode with silicon in synthesizer detector, good locking
Просмотров 262 часа назад
Putting in matched silicon diodes improved lock a bit. BUT I just ordered a batch of 100 germanium diodes from the Amazon Chinese Communists. So when those come in I will install them into the sync detector and see if there is ever bettah lock.
National company HRO 500 how adjust VFO top and bottom ranges for gross linearity after VFO changes
Просмотров 344 часа назад
Why was I adjusting VFO linearity you ask? The HRO is good down to 250 cycles with the dial markings. Well I was mucking with the VFO. I removed the cover of the VFO to put a crease in the cover to allow passage of the AGC knob / rod. I had tried to put in an aluminum switch rod. Long story and a MISTAKE. Leave the fiberglass rod alone - if the rod is still intact. DO NOT remove the copper cove...
National HRO 500 Maybe changing the function switch fiber glass rod to aluminum was a BAD idea?
Просмотров 397 часов назад
Seems the switch takes a lot of stress with the aluminum solid rod. And I BROKE the receiver doing this - no reception now. Not sure what I broke but I had the VFO cover off so... That is probably what I broke? Notes from THE FUTURE. Do not take off the copper VFO cover. Some mastermind technician at Natinoal Company who is probably DEAD by now was able to put the cover on the VFO and have it N...
National HRO 500 modify VFO cover to provide more clearance for function switch aluminum rod
Просмотров 347 часов назад
Was this even a civilized idea? Receiver does not work now. See that copper VFO cover in MY HAND? Never take it off if the VFO is WORKING. Just don't.
National HRO 500 replacing fiberglass function rod with aluminum function rod for the function sw
Просмотров 337 часов назад
Tale of TWO Rods. Hint (from the future). Do not bother replacing the fiber glass rod. If it is working - leave it alone. Probably not woth the 3 hours and multiple grinding and hacking sessions to try to pull off the switch from fiberglass rod to aluminum rod. The aluminum rod has NO give and this seems to stress out the function switch really badly. The design of this situation is not ideal f...
National HRO 500 fix the string drive from the band switch to harmonic generator for band change
Просмотров 569 часов назад
Nothing worse than trying to string one of these dial strings for the first time in years and years. Luckily the diagram was good. The synth harmonic generator does not track the band switch well so there was some error in this stringing situation.
National HRO 500 how to replace two lightbulbs in a turret and Lock unlock indicator bulb
Просмотров 449 часов назад
(Notes from the future). I ordered the special LOCK / Unlock light from eBay. I ordered 12 volt LED lamps from Amazon / China. Weeks to get these. So we wait. With some patience you can change the light bulbs inside of the rotating Synth cylinder and change the light for the red pointer in front. And OH whilst you are at it change the lamp bulb for the PHASE UNLOCK indicator too. That one is a ...
National company HRO 500 demo on bands one through five although operation is sketchy
Просмотров 4212 часов назад
How many HOURS into fixing this receiver now? One guy on a blog said he had 100 hours into fixing his HRO 500? I am sure I have exceeded 100 hours by now. Easy. www.antiqueradios.com/forums/viewtopic.php?t=343326 I am trying to get this receiver to a state of "normalacy" Meaning - it operates closely to how it worked when new. I would like to put in 7.0 Mhz on Band 3 and have it accurate on the...
National radio HRO 500 bands three and four calibrated and working demo
Просмотров 2914 часов назад
Here is a demo of Bands 3 and 4 working. I think this is after I oiled and greased the gear works and worm gear for the VFO to take out some of the grinding noises.
National company HRO 500 bands three and four calibrated and mostly dependable for using now
Просмотров 3914 часов назад
So I was able to finally calibrate band #4. The previous owner had broken a hex slug in an IF looking can which was the "L" part of the LC circuit for band #4. Was able to get a new slug from an "HRO 500 junkbox" that I paid $79 for on eBay. With that new slug I was able to calibrate band #4. Band #4 also had isues with the 2nd wafer back. So I cleaned that wafer up for the third time. The Synt...
National company HRO 500 bands 3 and 4 calibrated and working demo. Bands 1,2 & 5 dead
Просмотров 2314 часов назад
Formal procedure of measuring the heterodyne of the two 4.75 IF signals - one from the HF oscillator mixed with the Spectrum Harmonic Generator and the other from the 4.75 Mhz reference signal. You can see the waveform change in the scope to a locked condition. I have since fixed the LED circuit for displaying LOCKED condition.
National Company HRO 500 Receiver Demo on bands 3 & 4 after Spectrum Harmonic Generator repair
Просмотров 5416 часов назад
The spectrum Harmonic Generator was causing a lot of instability in the ability to hold Sync lock. With the HF capacitor being microphonic and changing frequency when the receiver is tapped I had thought this was the total reason for synch lock to go out when the receiver had even the slightest tap on the side or the tuning knob was rotated. I had not considered whatsoever Spectrum Harmonic Gen...
National Company HRO 500 Issues with Spectrum Harmonic Generator MANY assorted shorts and issues.
Просмотров 2816 часов назад
Capacitor shorting to ground strap on board. grey wires not soldered in well at all on top board. Some sketchy solder joints. 500 Khz crystal trimmer tab shorting against chassis
National HRO 500 Searching for bad solder joints on Spectrum Harmonic Generator with a plastic straw
Просмотров 4616 часов назад
I finally found issues. A capacitor was pressed too low to the board - SHORT intermittently. A tab on the 500 KHZ trimmer capacitor too close to the chassis - SHORT intermittently. 2 grey wires soldered into the top board far right terminals COLD solder joints - fixed it wih more solder nad heat. Maybe a capacitor on the lower board pressed down too low too - corrected. Transistors changed to s...
National HRO 500 improved 7.5 V and 5 V regulation with 8 V and 5 V active voltage regulators
Просмотров 4819 часов назад
National HRO 500 improved 7.5 V and 5 V regulation with 8 V and 5 V active voltage regulators
National company HRO 500 7 V & 5 V regulated critical for proper spectrum generator output at mixer
Просмотров 5219 часов назад
National company HRO 500 7 V & 5 V regulated critical for proper spectrum generator output at mixer
National company HRO 500 receiver HF oscillator extremely microphonic on FM mode test SDR receiver
Просмотров 4821 час назад
National company HRO 500 receiver HF oscillator extremely microphonic on FM mode test SDR receiver
National HRO 500 synthesizer instability possible fix band switch help for amateur operator in Japan
Просмотров 38День назад
National HRO 500 synthesizer instability possible fix band switch help for amateur operator in Japan
Balloon exhibit at Bellagio hotel Las Vegas, Nevada
Просмотров 27День назад
Balloon exhibit at Bellagio hotel Las Vegas, Nevada
Aquarium in Caesar’s Palace forum shops, Las Vegas, Nevada
Просмотров 8День назад
Aquarium in Caesar’s Palace forum shops, Las Vegas, Nevada
The destruction of the ancient city of Atlantis it went to the bottom of the sea at Caesars Palace
Просмотров 12День назад
The destruction of the ancient city of Atlantis it went to the bottom of the sea at Caesars Palace
August 17, 2024 out for a brunch treat in Las Vegas. Excellent Western Omelets here Belliggio Hotel
Просмотров 12День назад
August 17, 2024 out for a brunch treat in Las Vegas. Excellent Western Omelets here Belliggio Hotel
National company HRO 500 bands 2, 3, 4 and 5 partially working demo new band switch wafer
Просмотров 3814 дней назад
National company HRO 500 bands 2, 3, 4 and 5 partially working demo new band switch wafer
National company HRO five 500 band switch for HF oscillator details to fix band issues
Просмотров 1814 дней назад
National company HRO five 500 band switch for HF oscillator details to fix band issues
National company HRO 500 HF oscillator band switch replacement considerations back side LC grounding
Просмотров 2314 дней назад
National company HRO 500 HF oscillator band switch replacement considerations back side LC grounding
National HRO 500 HF oscillator new band switch partially installed band 4 still working after this
Просмотров 3814 дней назад
National HRO 500 HF oscillator new band switch partially installed band 4 still working after this
National HRO 500 HF oscillator band switch finish center soldering and test rotation of switch
Просмотров 6014 дней назад
National HRO 500 HF oscillator band switch finish center soldering and test rotation of switch
National HRO 500 HF oscillator band switch join rotary sections together with solder and wire
Просмотров 1114 дней назад
National HRO 500 HF oscillator band switch join rotary sections together with solder and wire
The reason for using the fibreglass rod was to avoid having metal interfere with tuned circuits. Anyone who's done an alignment on RF circuits would know that. Another reason, which might not apply here, is high voltage.
THANKS SO MUCH! THIS WAS SO HELPFUL
Your video is the only video that shows how to get that cover off. I’ve done changed me battery before. I went back and my old brain forgot. Thanks. I subscribed just now to repay you. Liked. Very good.
Wow what a journey , sounds great !!
that dosent look too bad! Thank you!
Thank you, sir. Without you, I wouldn't have been able to write this comment.
Worthy radio to restore. But can you get new transistors today?
Sure, you can get transistors on eBay and I’ve been using a few silicon from Bojack on Amazon for BI stable circuit and they seem to work
Thanks for showing us this step in replacing the light bulbs!!
Thanks
My Dog didn’t even care
”"I almost want to put the old rod back ín”" .....no, no, no, no,
Your ceramic wafer looks good in there.
I think so too!
Keep up the Great Work!!!
Thanks, you too!
Awesome. Congratulations on your accomplishment. Almost 100% done. You’ll get it to the finish line.
There is still a bunch of things to do, but thanks. I haven’t even touched the receiver yet. I’ve simply been working on this synthesizer the whole time the HF oscillator and the untuned, buffer, and the spectrum generator and the synthesizer cans and the mixer all that stuff has taken me a month
Sóme where thére are very old jàpanese engiñeers saying オッケー、見せびらかさなくてもいいよ , which means "alright, no need to show off!!"
Nice looking radio. Good job. 👍
Nice work
Nice to hear voices coming out of that speaker though!
Good job.
How far down should it go
You should probably go as far down as you can, but if you encounter stiff resistance, you don’t wanna force anything and break something so I would go down as far as you can until it tends to give up it has resistance that pull out and then see if you have water that’ll flow down take a look at the video and even see that we had lots of water going down there really briskly so you wanna go down enough to remove the clog
Wow! By the time your done you will have rebuilt the whole radio to the point the old engineers that created it wouldn't recognize it.
XingyHeng to the rescue!
That worked!!! Thanks! 😁
Love, hate, ? I can hear it in your voice! Ready to punt?
Aaa good old eg
Not knowing a lot about the workings of a radio, to restore it, I just shotgun most of it. And have discovered the best way to do this is to have another unmolested or just a working rig of the same model next to me to be my guide together with a schematic drawing.
I miss this train model
HOW DO I CONNECT IT WITH MY MAC STUDIIOOOOOO
This is a place that you take a woman that you want to romance 🦸
Onward and upward 👆
I know this is super old but thank you so much!
Great job on that switch.
You might want to dress your wheel diameter smaller to fit the job sometimes. and run it a bit faster. Good work. There are all kinds of cutters adapter to use with a dremal to be creative, carbide cutters/tooling are the way to go for most applications. But your cut off wheel was a good choice in this application. I'm a machinist toolmaker and I've used this tool many of times so. . . Blessings.
Can you run 1 cable for tv nd 1 WiFi modem from same company
Thanks - answered my question!
Lived there in the 70’s and 80’s I sure miss it! Boa Dr and then Skyland.
Boy, you like a challenge. You would be better off with a Dremel. or copeing saw blade.
Wow, the way past designers had to do things at one time. Today digital chips and GUI screens. If the task is not too complicated, I prefer tubes, transistors, buttons and knobs.
Wow, what commitment.
Man, plug 14 is crooked. Make it straight and the radio will play.
Keep digging
Wow, wish you well.
Thank you appreciate this!
Pull the shaft out of the radio from the front, if possible; take photos of the wiring to the switch; remove wires and remove the wafer affected. Take photos of the wafer (both sides) Someone may have the correct wafer; I can check my stash.
True vintage device.
That radio just won't quit, when you spin that huge dial looks like your doing the combination on a Bank vault. Keep at .....totally worth it.
I did a google search on centralab wafer switch and it yielded several possibilities.
Thank you so much for this video.
As .much time and money that you have in it, it may be worth your while to put in on the shelf until another one comes your way
Sorry about your misfortune. I have made similar mistakes like that as well so I can relate. Like you say, live and learn. Maybe all is not lost. I saw a video where a guy found a wafer from a cb to fix the band switch for a ts-520.