Pictures of the ZETAGI / b47. Type: All-mode linear amplifier: Frequency range: 20-30 MHz: Voltage: 11-14 VDC: Current drain: Max 20 A: Drive power: AM/FM/CW: 1-10 W SSB: 1-20 W: Maximum output power.
Got hold of a Zetagi 132B base amp. Looks a bit vintage. Anyway, shoved some RF into it and at 5 watts in, the power meter on the amp swings right over to 100 watts..OK..now put my power meter on the out with a dummy load and the amp meter still says 100 watts but my power meter says about 45 watts. To get a 100 out of the thing requires an input power around 25 watts. (amp meter telling me I pushing 200 whiskeys ). Question 1. Is this the norm for these amps? Question 2. Is there anything I can adjust to get it to around 80 watts with an input of 5 watts? Question 3. Is there anyway of adjusting the meter than just tells lies? Any info appreciated.I have just spent about two hours trawling through the forum tying to find the answer but to no avail
I have just bought and installed a Zetagi B300P amp and yes I know ( before all the why ?? comments and stuff! it's too late now I bought it, should have read the forum first!!) after trawling through the forum that this wasn't probably my best option I have set this up with my Euro 3900 and is powered by a MAAS SPS 330 II 30A, the problem I have is on SSB when the mic is keyed the amp won't stay in TX mode it sounds like there is a relay clicking in and out!! If I select position 6 on the variable power selector the TX stays on! AM seems to work fine showing a max of around 125w on the meter on level 6
Is it a faulty amp or am I doing something wrong ?? Any advice would be appreciated thanks