So to have the maximun distance from the Board Elements. I will cover them with Double Thermal Heat Cover and i install them on HeatSink with ties,(not very tight). I am thinking to do 2-3 holes on the HeatSink and i will tie up there the DC Cables, I will cut the tie and i will move the DC Cables close to HeatSink. Yes, agree,!!! i see the circuit with more detail.and you have right. One end connects to the RF output combiner between the output transformers, the other goes to the antenna relay,ĭC is fed to the center tap of the output transformers Wa10 wrote:The red jumper wire is RF output not DC m8, I am Waiting from you any advices, ideas, modifications, and if you have and the original Schematic diagram to send me!! (In conclusion,finally, i understand that the previous owner it was had these problems with that Linear, and maybe, finally it 'burns' the MRF's, so he decide to sell it at a Very-Very low Price. Have you any idea, advice, why the Transistors become too HOT? It's too dangerous to leave it more seconds on this High Temp Duty because i am afraid that i will blow off the MRF's !!! It's a fault of the Base Polarisation Voltage of the Transistors?.or fault of the output Transformers Circuit 'tuning'?, or other reason? So HOT that are 'forbitten Untouchable'.why do that? so to have maximum amplificationĪnother, major problem is that the Transistors in 5-10 seconds of duty, are become EXTREMELLY TOO HOT!!!. Have you any idea, advice, modifications, photos, schematics etc. I have not the HF Radio availability so to deserve Over 28.3 MHz to find exactly the Maximum Freq. It seems that the Amplify Linearity Bandwidth of the Linear Board Circuit is too High on Frequency Band. With RF Input = 10 watt from 25.6 - 28.3 MHz, at Attenuator position 6, i have the following.

I have connect a Alan 8001 Cb Radio, a 1 KW Dummy Load, a Power Meter, and

Zetagi b47 manual