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Ok thanks for the help guys... Still working on this old radio... I had all ready replaced bias diodes for final and the driver. I used 1n4001. Output is a little better now almost 20 watts am\30 ssb... Still cant adjust bias on the final. When keyed in USB no power or very little is drawn...
Merry Chistmas everyone... Still working on this 2510. Replaced the 2sc1969 final with a mrf455 mounted to heatsink very short hookup wires. Radio is now doing 12 to 15 watts... When trying to set bias for the final no current is being drawn. Any ideas guys what to look at next.. Thanks
I replaced Q133 and D165... Radio is now putting out about 5 watts... Someone has installed a 2sc1969 as the final transistor with 2 of the legs crossed. Going to try to find a alternative for that then see what I got... Thanks for the help you was correct D165 wasnt even installed..
This radio has very low tx power. You can hear audio from a nearby radio. All modes are same... I dont know much but I'm trying to learn and figure this out..
Q132 Voltages
Rx
B 0
C 14
E 0
TX
B .766
C 14
E .002
Q133
B 0
C 14
E 0
TX
B 7.95.
C 14
E .001
Base voltage on Q133 during tx is way...
This radio has very low tx power. You can hear audio from a nearby radio. All modes are same... I dont know much but I'm trying to learn and figure this out..
Q132 Voltages
Rx
B 0
C 14
E 0
TX
B .766
C 14
E .002
Q133
B 0
C 14
E 0
TX
B 7.95.
C 14
E .001
Base voltage on Q133 during tx is...
C22 is labeled a 103 it's value is a .01uf.
I will try to look into grounding antenna to house ground (Easy Job). House uses cold water line for ground. May take me a little time but also get radio equipment on a second grounding rod and get all grounds tied together as well.
Thanks for the...
I have components to do the negative feedback mod. I havent done anything inside the amp yet though. I will work on getting my equipment properly configured first.
Thanks,
Big D
Ok thanks again Shockwave.. The antenna itself isn't grounded the pipe it's connected to is. I grounded the mast on the lower 5ft using a screw into pipe and 10 gauge solid copper wire to a 4ft ground rod. Ground rod is maybe 2 ft from base of antenna mast.
The radio equipment isn't grounded...
Shockwave posted this earlier in this thread. Could this possibly help my swr issue?
Ah yes, the meat and potatoes of it all. To start with, add some negative feedback. You might get away with the simple .01 cap in series with a 100 ohm 2 watt or more resistor between the base and collector of...
Thanks loosecannon. I'm using a imax2000 about 25ft up to base of antenna with 75ft of rg8x (gray coax). Antenna is mounted on back of house to facial board and is grounded.
You know which cap would be input cap also is it a electrolytic or ceramic?
What length jumper would you try.. I will...
10-4. I have a uniden washington mb8719 pll.
Radio has been tuned by previous owner or Tech. No coil's inside look like the were spread. They installed variable dead key. Roughly 17 watts pep on AM around 20 on SSB.I did try a different radio still had high swr's. I also have a texas star amp...
222DBFL I tested it that way first before posting. Just about the same results connecting meter after the radio or amp they stay around 2.5 to 2.8 when amp is on. Raising the dead key the swr will go down some. I have tested this with a 1 to 3 watt dead key.
I have a TS amp that works fine...
Ok got some results. I didn't get very far before seeing a issue.
Radio to meter then antenna
Ch.1 1.2swr
Ch.20 1.1swr
Ch.40 1.1swr (maybe less needle barely move)
Radio to meter then amp and antenna
Ch.1 2.8swr
Ch.20 2.7swr
Ch.40 2.8swr
I checked transistors temp after testing swr and both...
Having a similar issue with a Palomar 250 2 1446 transistors amp. SWR are 1.1 without amp. When amp is on they jump up to a 2.5 when you modulate they go down to around 1.3. Trying to get some help to get this resolved. I'm using a uniden washington radio and have tried a 1 to 3 watt dead key...
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