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old resistors do change their values over time. If you disconnect ( unsolder ) one leg of each resistor then measure across it to get its value. If its far off, then replace it with a suitable value/wattage one. You could even look at the wiring connections. The power supply could also be...

I am a little peed off at FR, but nothing major. I volunteerd my time as a moderator on their forums via Klaas in Germany, but never even got a no thanks from them. I have a flex 1500 which has been upgraded to version 2.7.2 and its a nice improvement. I also suggested some changes to their TNF...

I fitted a 470R resistor on the input to ground and no sign of any instability in the amp, but a small increase in output on the lower bands. So far so good. Next step is another one in series to ground, which will be close to 1k. This may have to wait until I can get some space of the table. I...

Are you using an external pwr meter to measure the output? Amps that have been thrashed sometimes display this slow increase. What does the specs say about the input power and output power. Have you checked your radio on its own to see if the output is stable ? A USER MANUAL & CIRCUIT DIAGRAM...

The drive levels in watts of your radio, should always match the input of the amp you use. This may mean having the radio adjusted or a relay system made up with will switch in an antenuator to drop the radio's output to the required drive level on transmit and then bypass that antenuator on...

If you reduce the drive ( radio power level ) then the amp will reduce its output. There is a set drive limit on amps and exceeding them is at your own peril, the same for the output. Lets say you have a 100w amp that needs 10w drive level to achieve this. More drive of say 15w will up the...

One of the "problems" with a tube amp is that you will have to retune it again, if you move to far from the frequency where it was originally tuned up. You will see a drop in output power on your meter. Solid state amps dont have this problem as they are normally broadband...ie they are designed...

Actually, there is more to an amp than the colour of the tubes. First of all from the pic you posted the fan is really only cooling the closest tube and the others are not getting much airflow. However, twith the amp closed up properly, the fan might cause a nice pressurized cabinet, enough to...

Ok, well lets remember that some of these cb/ham amps are quite old by the latest standards and to tune or load them properly, each amp will have a handbook which states how its done. Solid state amps.. ie those without tubes, dont need tuning. I suggest you try and get a users manual for the...

Not of the antenna in use, its a bit difficult to take a picure of it because of the small garden. The dimensions should give you an idea of what it looks like

I was taught that "IGNORANCE IS NO EXCUSE ". Even with my amp, I am learning something new every day. I am slowly improving on it which can be a steep learning curve.

Any amp is only as good as how its used. There are set ways to use it regarding drive levels and loading and tuning. If neither of these are done correctly, the amp will exceed its specs and throw out splatter. Many amps sol off are either faulty or exceed spec, or too expensive to repair. There...

It def needs a lot of man hours to restore it back to full working order, so the labour may be more than the cost of a new amp. From what I can see in the pics, the solder joints are mostly dry and the wiring and components and cables need replacing. Best bet is to get an estimate to have it...

On a serious note, its going to take a while before another one emerges. Perhaps they can salvage enough of it. Would like to calculate the torgue on that antenna if what they said happened.

Perhaps it was seen as a threat ?

Whats the fcc database say ?

Yes, it was their money, and it goes to show that technology can fail in those weather extremes in the artic circle. The wind loading on that mammoth must have been huge.

Thanks for the circuit and the video link. Very interesting video and I will definitely delve into that a bit more. I built up a Ultimate 2 transmitter unit to drive my 472Khz transverter but silly me, I forgot that I would need a another receiver in the same box. The transmitter has an atmel...

too much money, not enough brains !

I am looking to switch a 12v relay via pin diodes from two different rf sources to drive a transverter. The relay will direct the one of the incoming rf levels, one at a time to the transverter. One has a 100mW level and the other 2w. Does anyone have a circuit for this handy? 73