You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The output impedance is (in general) V^2/(2*Po). The factor of 2 is based on the class of the amplifier. The lower the conduction angle the lower the factor 2 will be approaching one lower conduction angles. If you are running SSB, your output impedance is continuously changing (all over the...
They replaced C163 2pf with the mod. I removed it, had to re-tune, but it seems to work fine now. I found last night late where they changed a cap further on, going to look at that tonight. The 2000 was/is a great radio, don't know why people hack on it so much for basically insignificant...
It seems to be in the transmit signal path at C163, it is a 2SC710 running from the 8V transmit rail voltage. I measured the output at the base of TR39 and it was about the normal 86mv. Maybe they were trying to increase the bandwidth. I think I'll just put a 2pf cap back in. I don't want crazy...
I purchased a Cobra 2000 GTL and am trying to remove the mods from the radio - I removed the rotary switch style PLL mod, channels back to normal. Does anyone know what modification this is? Also an idea of what was changed to install this? If I remove it, appears to have no DC to the finals...
I have a 3300HP that when you first powered up, frequency was fine, change channels (some channels not all) and the frequency would be completely bogus - and actually drift. I ordered a PLL chip just in case, turns out changed IC6 & 7, problem solved. Don't know which one was causing the problem...
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.