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Post by FIXR on Sept 20, 2010 15:21:26 GMT -5
Is the hum on both AM and SSB transmit?
Fixr
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Post by FIXR on Sept 20, 2010 15:11:03 GMT -5
Tombstone,
The MKII series "B" didn't have the Collins mechanical filter in it. Supposedly when Rockwell took over Collins they raised the price of the filter rather significantly and Browning didn't want to raise the price of the receiver. They in turn added two IF transformers to replace the filter. The series "B" receiver is almost the same as the later MKIII.
Fixr
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Post by FIXR on Sept 19, 2010 11:32:28 GMT -5
The +5 V voltage regulator for the control board is the one farthest to the rear on the synthesizer cover. You should have +5 V on the blue wire running to the control board. C122 is the VCO voltage adjustment.
Fixr
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Post by FIXR on Sept 16, 2010 15:07:47 GMT -5
Firebot, I didn't reply to your last PM because the 68R and 69T is the one that has the sideband switch on the receiver and fine tuning control. You have the plain (mark I) Golden Eagle. Tombstone The 68R and 68T are the plain Golden Eagle's The 69R and 69T are the Golden Eagle MKII's Fixr
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Post by FIXR on Aug 3, 2010 14:43:07 GMT -5
Tom,
What is the SSB output?
Fixr
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Post by FIXR on Jul 28, 2010 18:35:25 GMT -5
5alive,
I would replace them with new tubes. A gassy tube could cause the distortion. The detector diode is CR3 on the schematic and it is a 1N67. A 1N34A or an NTE 109 should work as a replacement.
Fixr
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Post by FIXR on Jul 27, 2010 2:28:31 GMT -5
5Alive,
Try new V5, V6 and V7 6BA6 IF tubes first. If they don't help, maybe the detector diode.
Fixr
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Post by FIXR on Jul 8, 2010 16:10:20 GMT -5
Sandbagger,
I did try calling a couple of times and all I got was a 125 or something up in Canada. Then the Spanish with their massive roger beeps starting coming in.
Fixer
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Post by FIXR on Jun 29, 2010 3:44:35 GMT -5
Bus Driver,,
Yes, Hagerstown, MD on Wednesday and back up to PA for the rest of the Speedweek races ending at Selinsgrove on the 4th. Everyone, have a Happy 4th!
Fixr
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Post by FIXR on Jun 24, 2010 16:58:43 GMT -5
OT-457 DQRR, I heard you for a very short time and then you was gone. Hopefully conditions will be better next time. OT-441 Spitfire's MKIII's sounded very good. I didn't get a chance to hear OT-2632 Sandbagger's MKIII's very long because the conditions changed. I did hear you guys occasionally throughout the evening. I also heard a couple of Canadian stations trying to check in. The MKIII's I was using belong to an OP in the Lancaster area. I will be taking them back to him next week on my annual trip to PA.
OT-480 Fixr
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Post by FIXR on May 28, 2010 19:56:15 GMT -5
Spitfire 441,
I had a 5-6 S unit noise level plus all the splatter from channel 6. Hopefully it will be quieter next week.
Fixr
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Post by FIXR on Mar 24, 2010 17:27:42 GMT -5
Marc,
VTVM between ground and the junction of R38, R39, R46 and C40.
Fixr
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Post by FIXR on Mar 24, 2010 16:33:39 GMT -5
I wouldn't worry about the "S" meter readings at this time. What is the negative voltage at the detector testpoint with 50 uV input at the antenna connector? If lower then -9 V, then I would change L2 first. This is the 18 uH choke right before the first 6DS4.
Fixr
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Post by FIXR on Feb 15, 2010 19:17:46 GMT -5
ZMan,
PM sent.
Fixr
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Post by FIXR on Dec 21, 2009 16:26:55 GMT -5
Zman,
I sent you a PM.
Fixr
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Post by FIXR on Dec 15, 2009 23:30:40 GMT -5
(The channel-selector switch is hidden from view, but also came out of the same radio.]
Actually the channel selector probably came out of either a Cobra 21XLR or 29XLR. It has to be the three section type with the front sections activating the channel display and the rear section for the PLL. The Cobra 77X or RS TRS452 channel selector was a single section activating the PLL and the channel numbers were on the knob.
Fixr
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Post by FIXR on Jul 22, 2009 11:17:06 GMT -5
Maddog 2020,
I sent you a personal message.
Fixr
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Post by FIXR on Jun 19, 2009 17:13:25 GMT -5
Check the voltages on V601A. There are a couple of 47K and a 470K 1/2 watt resistors that sometimes change value. If that tube checks OK, go to the next 6GH8A, V600A and check there. V602A would be next after that, but if the receiver volume is OK it is probably OK also.
Fixr
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Post by FIXR on Jun 17, 2009 22:28:14 GMT -5
555,
I sent you a personal message.
Fixr
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Post by FIXR on Jun 12, 2009 21:17:54 GMT -5
Husker,
Marc has a good idea on replacing all of the electrolytic caps on the BM board. Cures most of the problems.
Fixr
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Post by FIXR on Apr 12, 2009 10:52:36 GMT -5
The WR-II was either built by D&A or by someone else with the parts left over from D&A. These were the very last of the D&A type amplifiers. The T-600 Phantom clone was also in this same series. I have one of the WR-II's also, and never had any paperwork either.
Fixr
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Post by FIXR on Apr 12, 2009 10:31:53 GMT -5
The Memtrix PLS-4 is an EPROM controlled synthesizer similar to the control and synthesizer section in the Browning MKIV transmitter. One section of receiver tube V4 is the receiver VFO oscillator and the other section is a mixer. You will have to have one installed for it to receive. Fixr www.TubesPlus.com
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Post by FIXR on Mar 28, 2009 19:43:14 GMT -5
Dr., I sent you a Personal Message.
Fixr
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Post by FIXR on Jan 20, 2009 0:49:26 GMT -5
That is an 82 ohm resistor that goes to the plate of the final output tube. The wire wrapped around it makes a parasitic suppressor. The same as on the plate lead of a linear amplifier.
Fixr
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Post by FIXR on Jan 4, 2009 21:52:56 GMT -5
You can tell if you have a relay problem in the antenna output section by placing the meter switch in the FWD position and setting the needle to the middle scale or wherever with the SWR CAL control. When the power drops out, look and see if the needle is where you set it at. If it is,then the output section of the relay is bad and not letting the power out to the ant connector. The SWR indicator board is between the output tank circuit and the relays.
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Post by FIXR on Dec 31, 2008 6:44:17 GMT -5
Bob,
If you are calling the "ping" resistor the one on the tiestrip that also has the red wire from pin 6 of the 6AQ5, then it should be a 2.2K. The positive of the "ping" capacitor would go there also.
Alan
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Post by FIXR on Dec 22, 2008 23:28:40 GMT -5
Amastron,
It would be for a radio with an 11 Mc synthesizer then. The PAL VFO's add approximately 5 Mc's to the crystal frequency in the VFO. A Browning MKIII needs a VFO with 16 Mc output.
Fixr
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Post by FIXR on Dec 22, 2008 22:24:36 GMT -5
Is it 1B or B1? Can you read the frequency on the crystal on the inside?
Fixr
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Post by FIXR on Dec 7, 2008 13:37:36 GMT -5
The relay in the transmitter should stay engaged as long as you have the mic keyed. I would look and see if the relay is actually unkeying and if it is you have voltage problem in the power supply somewhere caused by the higher SSB peaks.
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Post by FIXR on Dec 6, 2008 22:05:58 GMT -5
At one time the two power resistors have been "strapped" (jumped) for more output power. Somebody must have wizened up and cut the jumpers.
Fixr
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