Single isolators are meant for transmitter protection from reflected power and antenna failure and low end transmitter combiners.
Dual stage is more tailored for intermod reduction and wide bandwidth low distortion (TV) applications. Triple stage is more tailored for a close spaced high power single antenna transmitter combiner. Also take into consideration that the tuning caps in a circulator are a weak point, and can fail at the worst possible moment. I've had one circulator that has been rebuilt 10 times. Also the circulator changes tuning with tempreture. Not really a problem with intermitant use, but in commercial service the circulator is usually tuned 0.5 to 1 MHz low and drifts on to frequency during the first 15 minutes of use. On 10/25/07, Steve S. Bosshard (NU5D) <[EMAIL PROTECTED]> wrote: > Can't an isolator do both, provide a constant 50 Ohm load to the > transmitter, and offer 30 (single junction) to 60 (dual junction) of > isolation from signals travelling from the antenna to the transmitter > for mixing. If isolators were just to provide a constant load, why are > there dual junction isolators ? > > Steve NU5D >
