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Post by BladeRunner now OLD FLASH!!!!! on Jan 20, 2009 13:34:27 GMT -5
My Mark III has developed a warble on the SSB channels. I'm pretty sure I know which tubes I need to check. Is there anything else I need to check? I appreciate the help. (warble described as talking through a slow spinning fan. Modulation is loud )
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Deleted
Deleted Member
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Post by Deleted on Jan 21, 2009 16:55:00 GMT -5
Mod limiter? Did those things even have one?
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Post by mark4 on Jan 21, 2009 21:37:25 GMT -5
1st off. These radios are not much of a sideband performer anyway. Browning new it and really didn't care. If I were to really use any of my Brownings on SSB it would be the IVA. I have seen this problem with a MarkIV. Cause-Relay and or socket. PLL can loose. (III does not have). Radio that has been poorly aligned. Just to start with.
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Sandbagger
Administrator/The Boss 
Posts: 6,250 
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Post by Sandbagger on Jan 22, 2009 8:18:10 GMT -5
1st off. These radios are not much of a sideband performer anyway. Browning new it and really didn't care. If I were to really use any of my Brownings on SSB it would be the IVA. I have seen this problem with a MarkIV. Cause-Relay and or socket. PLL can loose. (III does not have). Radio that has been poorly aligned. Just to start with. I would have to agree, the Browning Mark III is not the best radio to use on SSB. The transmitter is normally not all that bad (Although the power doesn't seem to get much above 10 watts PEP). But the receiver is just not in the same league as other SSB radios. Most Golden Eagle users run them on AM, where they stand out head and shoulders above the pack. But IMHO, there are far better radios out there for the serious SSB operator. |
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Post by Night Ranger on Jan 22, 2009 12:14:40 GMT -5
1st off. These radios are not much of a sideband performer anyway. Browning new it and really didn't care. If I were to really use any of my Brownings on SSB it would be the IVA. I have seen this problem with a MarkIV. Cause-Relay and or socket. PLL can loose. (III does not have). Radio that has been poorly aligned. Just to start with. I would have to agree, the Browning Mark III is not the best radio to use on SSB. The transmitter is normally not all that bad (Although the power doesn't seem to get much above 10 watts PEP). But the receiver is just not in the same league as other SSB radios. Most Golden Eagle users run them on AM, where they stand out head and shoulders above the pack. But IMHO, there are far better radios out there for the serious SSB operator. My Browning Mark III transmitter has gotten good reports on sideband, but the sideband receive is awful. The receive sounds like it is still using a 6kHz filter to receive sideband. It probably is. My Drake TR-7 gets a similar sound on sideband if I switch in the 6 kHz filter instead of the 2.3 kHz filter. |
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Post by Sniper..Unit 305 on Jan 22, 2009 14:22:21 GMT -5
I too like Night Ranger get good reports on transmit on my Mark III, but also like Night Ranger, the receive stinks, its not even close to my D201's...not even close !! I always wanted a Mark III so I'm not going to complain too much about it, just glad I didn't buy one when I had to pick between a D201 or the Mark III back when I got my D201 new. Sniper
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Sandbagger
Administrator/The Boss
Posts: 6,250
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Post by Sandbagger on Jan 22, 2009 14:27:52 GMT -5
I would have to agree, the Browning Mark III is not the best radio to use on SSB. The transmitter is normally not all that bad (Although the power doesn't seem to get much above 10 watts PEP). But the receiver is just not in the same league as other SSB radios. Most Golden Eagle users run them on AM, where they stand out head and shoulders above the pack. But IMHO, there are far better radios out there for the serious SSB operator. My Browning Mark III transmitter has gotten good reports on sideband, but the sideband receive is awful. The receive sounds like it is still using a 6kHz filter to receive sideband. It probably is. My Drake TR-7 gets a similar sound on sideband if I switch in the 6 kHz filter instead of the 2.3 kHz filter. That's the joke, there is NO filter in the Mark III receiver (There is in the transmitter). It gets its selectivity through a series of hi-Q tuned circuits, so it's not nearly as narrow on SSB as a radio with a 3 Khz filter in it. That will also adversely affect the noise floor on SSB as well, as a radio with half the bandwidth will improve its signal/noise performance by 3db over a standard 6 Khz bandwidth. The Tram D201 has a far better SSB receiver out of the two kings of the classics, but even your TRC-451 is leaps and bounds better on SSB than the MarkIII.... |
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Post by BladeRunner now OLD FLASH!!!!! on Jan 22, 2009 16:10:08 GMT -5
I agree with you all to a point but all I have is the mark III and have to deal wiht it. I have realy had had no problem talking or receiving sideband on my mark III. I's very east ot tune (even with the VFO) It doesn't drift any at all. I could use a little better receive but I'm in a valley and I can hear and talk to anyone everybody else does including the susposedly beter radios. . I did find the warble issue remedy though in a brainstorm while wattching TV. fyi.
I have a Pal VFO. I also have a frequency counter that requires 12 volts. When I first go the counter I put it on a seperate Power Supply. I used it like that for awhile. I noticed that my Paal VFO has a 12vols source on it So I connectedte it to that and eliminated a component. A few days later and the guys reported the warble back to me. Last night i thought back to the lsat thing changed on the setup and bam! I reconnected the frequency counter back on the independent PS and the warble disappeared. DOn't know if it was draggging the Voltage down on the VFO or interfeering with it in some other fashion , but it did completely eliminate the problem.
As far as performance I've had all kinds of radios including a Tram D201 back in the day and the Browning has been my preference. I Read hre in hte forum where the Eagle ws a pain on SSB but I have found it very easy to tune and VERY stable, plus I can hear and talk to anyone anybody else can including the folks with te 100 ft towers and Jo Gunn antenna. As a matter of fact, the first time I talked side band on it, it was so easy to tune I was very surprised.
Anyway, I'm happy with it for now and I'm sure there are beter radios but I have to use what I have . I appreciate all the replies though. I always learn an immence amount from your shared knowledge ......
Thanks Again
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Post by Junior on Jan 22, 2009 16:19:14 GMT -5
That might be your problem i think that that 12 volt terminal is so that the vfo can run on 12 volts, not to supply 12 volts for other items? Just an idea.
JR
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Post by BladeRunner now OLD FLASH!!!!! on Jan 22, 2009 17:08:01 GMT -5
Dufus......If it's that don't tell anybody i did it. Please keep it quiet.....Shhhhhh
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Post by Marc on Jan 22, 2009 18:16:53 GMT -5
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Post by Junior on Jan 22, 2009 22:14:25 GMT -5
Just call me Schultzy! ;D
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amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Jan 24, 2009 13:13:54 GMT -5
Dufus......If it's that don't tell anybody i did it. Please keep it quiet.....Shhhhhh Not to feel bad, I did the same thing but happened to notice it didn't say "12VDC SUPPLY" on the back.... 73's |
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Post by BladeRunner now OLD FLASH!!!!! on Jan 25, 2009 13:39:42 GMT -5
THanks for the link to cbtricks. I should have know it was there also.
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Post by Marc on Jan 26, 2009 11:52:54 GMT -5
Any Time!!!
Marc
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