Monacor FSI-5 Power SWF Meter CB Watt Power Antena - Etsy
Second Hand Monacor FSI-40 FSI-40 SWR Power 1.5-150MHz Meter
Vintage Monarch FSI-5 Combination SWR and Field Strength Meter Made in Japan NOS | eBay
Would anybody know what the knob in the middle of this meter does? I was given one like this by a friend but not sure how to operate it. Thanks for the
Vintage Quement Electronics Two Meters SWR Bridge Model SWB-2 | eBay