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Johnson Viking II sending carrier with plate off




 
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Author Topic: Johnson Viking II sending carrier with plate off  (Read 83071 times)
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KB2WIG
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« Reply #25 on: March 26, 2017, 07:30:13 PM »



How much 'carrier' are you actually getting with the plate switch in the off position?

Just fer  sh@^$ and grins, what do the Johnson act like when your using the Xtal  on its 2nd harmonic?

klc

Please find the problem before I drag my Johnson out and put it on the bench.
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KC3GMQ
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« Reply #26 on: March 26, 2017, 07:39:24 PM »

As far as how much,  not sure.  Enough to shut down my receiver and to see on the panadapter.  I posted a pic earlier.  2nd harmonic,  I saw that in the manual, I double checked and made sure I loaded the finals correctly.

Dave
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DMOD
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« Reply #27 on: March 26, 2017, 07:47:38 PM »

As far as how much,  not sure.  Enough to shut down my receiver and to see on the panadapter.  I posted a pic earlier.  2nd harmonic,  I saw that in the manual, I double checked and made sure I loaded the finals correctly.

Dave


So what are you seeing on the panadapter? The primary frequency of the crystal or a second harmonic of the crystal frequency?

If the CW/Phone switch is in the CW position Keyup, remove the crystal and it should disappear.
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KC3GMQ
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« Reply #28 on: March 26, 2017, 07:53:03 PM »

If I am in CW, there is no carrier going out unless I key Down.  If I key down with plate off, the carrier shows up again.  it is the same frequency as the crystal.
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KB2WIG
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« Reply #29 on: March 26, 2017, 08:07:47 PM »



Is the JV2 in or out of its case?
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KC3GMQ
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« Reply #30 on: March 26, 2017, 08:12:20 PM »

Ok,  I pulled C-15 and C-50.  checked them in Cap mode on a fluke 79 II in cap mode.  Both read 5.3 both directions.  Both read open in resistance mode .

Dave
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N1BCG
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« Reply #31 on: March 26, 2017, 08:13:20 PM »

If I am in CW, there is no carrier going out unless I key Down.  If I key down with plate off, the carrier shows up again.  it is the same frequency as the crystal.

That actually looks proper. According to the schematic, with a key inserted, the mode set to CW, and the Plate switch off, there should be no carrier on the SDR until the key is pressed. In Phone mode, there should be no carrier until the HV Plates are turned on.
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KC3GMQ
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« Reply #32 on: March 26, 2017, 08:15:42 PM »

I agree
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N1BCG
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« Reply #33 on: March 26, 2017, 08:16:29 PM »

Ok,  I pulled C-15 and C-50.  checked them in Cap mode on a fluke 79 II in cap mode.  Both read 5.3 both directions.  Both read open in resistance mode .

Dave

Try with these removed. Another post mentioned C46 and C47. Try changing the meter switch to see if the mystery signal remains.
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KC3GMQ
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« Reply #34 on: March 26, 2017, 08:17:31 PM »

KB2WIG  Refresh me please on JV2?

Dave
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DMOD
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« Reply #35 on: March 26, 2017, 08:18:03 PM »

If the CW/Phone switch is in the CW position Keyup, remove the crystal and it should disappear, or switch to VFO and it should disappear.

WIG was asking if the Johnson Viking II was out of the case.
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KC3GMQ
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« Reply #36 on: March 26, 2017, 08:20:35 PM »

DUH  lol,  I have the top and bottom off.  Yes, If I go to ) on the crystal the carrier goes away
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KC3GMQ
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« Reply #37 on: March 26, 2017, 08:23:06 PM »

If I go to 0 Zero, the carrier goes away
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KB2WIG
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« Reply #38 on: March 26, 2017, 08:31:14 PM »



D,

I've pulled a lot of my hair out on my Viking 2. You really have to have all your ducks in a row, (buffer here, crank over there, driver ready and the infamous  hidden plate resistors)........

klc
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N1BCG
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« Reply #39 on: March 26, 2017, 08:32:27 PM »

If I go to 0 Zero, the carrier goes away

But that's just selecting no crystals, right? Does changing the meter switch get rid of the carrier?
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KC3GMQ
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« Reply #40 on: March 26, 2017, 08:37:37 PM »

I just tried it and no, the meter switch has no effect.  Also verified it goes away if crystal is out of socket.

I know its hard to help someone without having it in front of you.  Thanks to all who are helping me.

Dave
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N1BCG
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« Reply #41 on: March 26, 2017, 08:41:55 PM »

We shall not be daunted!

Something is providing an electron path between the cathode of the oscillator and ground. So you still get a carrier with C15 and C50 disconnected? I wonder if SW2 has a carbon trace between its contacts.

Pin 7 is the cathode. Disconnecting leads to that pin can help isolate the bad component.
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KC3GMQ
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« Reply #42 on: March 26, 2017, 08:43:24 PM »

Oh...I had put the caps back in,  should i pull a lead and try it?
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N1BCG
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« Reply #43 on: March 26, 2017, 08:46:24 PM »

Oh...I had put the caps back in,  should i pull a lead and try it?

Yes because caps can conduct only at higher voltages.
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KC3GMQ
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« Reply #44 on: March 26, 2017, 08:53:12 PM »

Carrier still there with cap leads off
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N1BCG
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« Reply #45 on: March 26, 2017, 08:58:35 PM »

Carrier still there with cap leads off

Ok, those are innocent and can be connected. Can you disconnect the lead to the accessory jack? That would isolate problems with L68 and the socket.

Nothing's connected to the socket, right?
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KC3GMQ
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« Reply #46 on: March 26, 2017, 09:04:23 PM »

I had both c-50 and c-15 off, so thats the tube and the socket both,  I'd have to lift the lead on the L68.  Actually, with the cap lifted, L-68 is going to the #8 on socket which is a dead end, not grounded with the cap lifted
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N1BCG
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« Reply #47 on: March 26, 2017, 09:11:39 PM »

Could you post a closeup of the lead connections to the 6AU6 socket? Seeing it might trigger ideas...
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KC3GMQ
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« Reply #48 on: March 26, 2017, 09:16:51 PM »

If these are not good enough Ill take some more



* IMG_2774.JPG (27.8 KB, 320x240 - viewed 679 times.)

* IMG_2773.JPG (34.44 KB, 320x240 - viewed 677 times.)
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KC3GMQ
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« Reply #49 on: March 26, 2017, 09:19:55 PM »

these should be clearer


* IMG_2773 (2).JPG (904.08 KB, 2016x1512 - viewed 711 times.)

* IMG_2774.JPG (27.8 KB, 320x240 - viewed 648 times.)
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