Discussion in 'Radio Circuits, Repair & Performance' started by CIPMAN, Mar 30, 2020.
What did you set the bias to on the FET's?
What keeps stray RF from getting on that prototype board ?
Did you look at purity using a spectrum analyzer ?
I set the quiescent current 1A each (2A total).
No access to such equipment. Maybe I will find someone who has one after all this is over. For now I'm happy the ATU is doing its job as it should. Harmonics and odd RF usually leads to ATU not working properly.
Same kind of piggyback board is used for PROII conversion and some of those were tested and found adequate.
I might add some capacitors to ground before and after the "aerial" wires.
As per KA9JLM sticking a 'speccy' on the end would be interesting... wonder how these RD15HVF1 cope at 144Mhz 14db gain @ 175Mhz *might* prove a useful device, I don't think the original drivers would give that, I forgot their specs.
Do you still get the 2mtr drive, the HF drivers in the TS2000 are also the VHF drivers. Still got them fakes on mi' bench here....'somewhere'!
95W on 2m vs 110W on 20m .
I'm very surprised to see that the TS-2000 has the PA Board just under the lid, rather than bolted on the back . . .
What does it do for a heatsink? (and presuably no fan)
It uses the [whole] chassis. It has a fan right behind the front panel blowing from front to back of the TRX (running when needed).
Hmm . . . I don't like that idea !
Heat can cause issues on all kinds of components.
I don't even like the idea of my TS-930S heatsinks on the back getting hot in the first place, so I have fans that run as soon as you turn the rig on.
A FB may be in order also.
FB?? Faraday Box?
Another option would be to replace the pots and the entire piggyback board with fixed resistors placed in a coax braid shield - now that I know the values for this pair of FETs.