HF linear amplifier and interference.

[davelectronic]

Recently I have added a digital panel volt amp meter to a 10 Amp low voltage power supply. When using the HF transceiver the panel Amp Volt meter flashes and is iratic on the display. Although if I try a different load (halogen lamps) it's completely fine the panel Amp Volt meter reads clear accurate with no problems. Is there a solution to this problem, and if I use the transceiver with just 4 watts RF output, even that causes erratic panel meter display of the numerals. Would putting distance between the power supply and the HF transceiver / linear amplifier correct this problem ? The only thing is I wanted to avoid dropping voltage over a longer supply cable run, although I know keeping a decent wire gauge size would minimise any voltage drop. Any thoughts appreciated, thanks for reading.

[iMo]

Try with decoupling at the PSU's output terminals.
CLC filtering is usually required.
Ferrite toroids with 3-5 turns (10-100uH) and ceramic capacitors (10-100n).

[TheMG]

I'm assuming this is one of those inexpensive LED panel meters? My experience with them is they are usually extremely sensitive to RFI. Some decoupling/filtering at the input to the meter will be necessary.

[bob91343]

The ferrite bead is your friend.  I have them all over the shack and no problems.  Sometimes a few turns helps.

[davelectronic]

Yes it is the inexpensive Volts Amp panel meter. I usually use analogue panel meters for Voltage and Amps, with a shunt. But this time tried the little two colour digital panel meter. I don't have anything in the way of filtering to the meter, but can try an inductive capacitance filter, see if that stops it. Thanks for the help.