Re: Power supply adjustments
A few tenths of a volt. I was in jest with you Bob…All this volt stuff is really not very significant. Keep the K3 output at 25 to 40 watts and the IMD will be at minimum. I’ve looked at the IMD specs on these transistors and at about 40 watts or so they are the cleanest as I think you already know. I would not trade a 12 volt rig for a 40 or what ever final which requires a special PS. If I have a PS failure (which I have had in the past) I simply go to the shop, grab another and I’m back on the air. With these rigs with built in supplies at 40 volts something the whole rig goes back unless the ham is good at repairing switching supplies which for me I am not. I just grab my spare and be gone. Example the Icom 7800 PS, not even a schematic avaliable for it and I hear the cost for replacement is somewhere South of one kilobuck…can you believe it. I’m just a poor old ham and having a spare PS fits my needs just fine.toggle quoted messageShow quoted text
On 06, Nov 2019, at 17:14, Bob McGraw - K4TAX <rmcgraw@...> wrote:
The Fluke was used only to determine the voltage while setting the power supply voltage. I'm not about to tweak the supply voltage with the radio turned on! The Fluke is more accurate than the analog meters on the power supply. Then with the radio connected and turned on, the Fluke at the power supply indicated 14.49 while the voltage indication on the K3S was 14.4. I'd say 0.09 volts difference would be acceptable. Oh what is the accuracy of the voltage indication in the K3S?
Please explain "voltage drop to your Fluke"?
On 11/6/2019 5:04 PM, dalej via Groups.Io wrote:
Remember to take into account the voltage drop to your Fluke DMV ( I use Fluke 77). The best is to use the K3 onboard meter, that should show you the real voltage the K3 is seeing.