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Fun and games with the NC-183D




 
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KB2WIG
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« Reply #25 on: April 21, 2019, 08:20:43 PM »



J,

I'm a bit hesitant to diddle with the transformers yet; peaking to test is a FB idea.

When I get the 8656B this week things should go better..... the ePay seller had 5 or 6 pictures of the unit operating into a scope, so I guess it should work out OK. I considered buying a plastic Chinese generator, but HP ( or whatever its called now) has the name.

We'll find out this week.

klc
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Patrick J. / KD5OEI
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« Reply #26 on: April 22, 2019, 08:41:37 PM »

That;s a great radio set!
I had one before trading it for an SX-28 because the fellow said the SX28 was too heavy and had too many controls. Fact is the -28 had issues with which I was to be surprised later.
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« Reply #27 on: April 23, 2019, 09:40:53 PM »

I have a copy of the manual.
You probably have it but just in case.
Keith
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« Reply #28 on: April 24, 2019, 11:47:42 AM »


K,,

Thanks for the offer... i've been using a BAMA manual thats not real good, and Mike, ke0zu has a flow chart of the beast......   curently waiting for a copy from Pete,  el manuel man.

KLC
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Jim, W5JO
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« Reply #29 on: April 24, 2019, 04:54:02 PM »


Thanks for the offer... i've been using a BAMA manual thats not real good, and Mike, ke0zu has a flow chart of the beast......   curently waiting for a copy from Pete,  el manuel man.

KLC

I hope you discussed which version of the schematic you need.  There were several versions of the schematic and two different versions of the radio itself.  One has a 6SN7 for a phase inverter/S meter amp. and the other measures AGC for the S meter action and uses a 6J5 as the phase inverter.

If you run into trouble there are many here that can help.
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KB2WIG
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« Reply #30 on: April 24, 2019, 06:44:12 PM »



J,

I've the 'old' one, the 6J5 phase inverter.


The HP showed up at the door, so I'll skip out early from work tomorrow, grab some N connectors and and brew up some leads.  Syracuse has an actual electronics supplier, ( tubes in stock !) so I can get stuff locally.

more to follow,

klc
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MikeKE0ZUinkcmo
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« Reply #31 on: April 24, 2019, 10:37:55 PM »

I have two flow charts for the 183, follow the link in the Sig line below, and the ER (engineering run) numbers are in the title blocks.  
My understanding is that each production run of radios, regardless of model were built to a particular Engineering Revision, with the appropriate printed owners manual, so you won't necessarily find the manual with the exact ER for your radio, simply  because there were so many issues of various manuals.


ERs are noted in the lower right hand corner of the rear cover.

 
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Mike KE0ZU

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KB2WIG
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« Reply #32 on: April 25, 2019, 03:58:41 PM »



M,

I've got your ER328 flow chart. ( I guess I can call it that??)

We'll be posting some updates either tonight or tomorrow r/e status of the IF.  Who wudda thought binary signal tracing would be so hard.

klc
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KB2WIG
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« Reply #33 on: April 26, 2019, 11:12:19 PM »



The 1st converter has what appears to be a nice 71.4 Mc  signal........ 

This does not look good.

klc
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KB2WIG
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« Reply #34 on: April 29, 2019, 12:08:36 PM »

  


V3  1st converter

71.4 Mc.signal.

Rcvr tuned to 2.2Mc, "D" band  1.55 to 4.4 Mc tuning range.. Single conversion on lower 2 bands, dual conversion on upper bands.


Any guesses as to why I 'm getting this???      《 《  I didn't post it up side down, the phone did it  》 》

KLC


* 20190427_154631.jpg (4389.71 KB, 5312x2988 - viewed 61 times.)
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MikeKE0ZUinkcmo
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« Reply #35 on: April 29, 2019, 10:04:15 PM »

Have you verified the BS knob is installed/oriented on the shaft correctly?

Have you checked the "single/double" converter switch for continuity, wiring?

DC Voltages OK?

Have you tried another tube?

Are the terminations, L-21 / L-39 OK?

Checked/replaced Bypass caps C22/23/61?

Have you cleaned the tube socket?

What probe are you using, X1, X10?

Where in the converter circuit are you looking?

AFN










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Mike KE0ZU

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KB2WIG
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« Reply #36 on: April 29, 2019, 11:25:24 PM »



M,

A few quick answers before beddy-by. I'm trying to get this thing working 'single conversion' before I play around with the other bands.

I'm using 10X probes for the scope.

I've looked at pin1 for the LO and also at L19. The tube is a NOS 6BE6. I've replaced (3) 6BE6,(4) 6BA6, all NOS, and the 6AH6 with an unknown age. I have also swaped the 6AL5s, as I can't find any of my own.... I'll probably replace them with NOS ASAP.

I'll check the bypass caps, L-21 / L-39....

For voltages, V1,V2,V4,V7,V8 and V10 have some voltage values outside of published figures. I did take measurements per the Manual instructions.

No' I haven't cleaned the tube sockets. Most of the swaped tubes were 'tight' when replaced. Something to do.

The converter switch works O.K.. As far as the bandswitch, I think that's OK also -  doesn't look like anything has been moved.  I have not replaced any of the alleged SM caps or resistors in the coil/trimmer sections. I left the disc caps alone, but replaced almost all other resistors and caps in the radio.

Thanks for the input, now we'll see what I can do with it.

klc
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WZ1M
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« Reply #37 on: April 30, 2019, 02:37:29 AM »

Food for thought, voltages will be off if your running 120 plus AC volts on the power transformer primary. I would run the 183 off a variac.
Just saying,
Gary
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KB2WIG
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« Reply #38 on: April 30, 2019, 12:07:56 PM »

8

G,

Good idea. Future plans are to run the receivers off of a seperate, controllled ckt to keep things around 115.

As of now most of the voltage anomolies are of low voltages.

KLC
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Bob W8LXJ
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« Reply #39 on: April 30, 2019, 02:45:05 PM »

  My 183D had sat in the heated room for 25  years, never plugged into 110 or turned on.
At 85 VAC, started to get high voltage DC on the tubes. A few Black by pass caps smoked and replaced them. Tube pins were tight in the sockets from oxidation, a lot of detox on tube pins, sockets, and rotary switches. Started to come to life, but tubes were gassy. After about 10 hours of 115VAC, started sounding better but not as good as the HRO 60 which is my main AM receiver. Have had the 183D since 1954, was my only receiver until  1970s when I went to SSB.

 Bob  W8LXJ,  Kw-1 and National and Collins receivers
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