- February 14, 2021 at 5:53 am #116774timinboveyParticipant
Total posts : 805
As you may know I’ve been running a Procaster for over 7 years with zero issues. Perfect performance 24-7 since firing it up.
This weekend I’ve discovered a limitation. Ambient temperature. At -37 degrees below zero F it goes a little bonkers and over modulates. It may have been colder than that. it was -37 on the ground on the north side of the house. 30+ feet in the air it may have been colder. But at that temperature there was excessive over modulation and distortion. Once the temperature managed to come up to about -30 it cleared up. I believe this is the coldest it’s been here since I put up the transmitter. So, I’ve finally discovered a limitation of the Procaster. Probably not a widespread issue, LOL.
TIBFebruary 14, 2021 at 9:31 am #116775MarkModerator
Total posts : 711
-37 F Wow! Fortunately that is not for more than a few days a year.
This transmitter is quite good if it has to get that cold for it to malfunction and then be fine when it goes back “normal”.
Although -30 wouldn’t be normal. Must be a fine line where performance degrades.
Found it surprising that with wide temperature changes summer and winter etc. you once said that you needed no retuning the antenna.
February 21, 2021 at 5:16 am #116893timinboveyParticipant
- This reply was modified 1 year, 3 months ago by Mark.
Total posts : 805
Yes. I was expecting to tweak the tuning a bit in the weather extremes but my attempts to tweak didn’t find any better match/output. And I do field strength readings every now and then – probably a couple ties a year now – used to do it more often – at about 20 spots around the area and signal remains pretty darn constant. I use a calibrated Potomac FIM, the same one i use for monitor point readings for commercial directional AM stations. Mighty solid transmitter!
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