For several weeks now, I've noticed a pronounced reduction in gain of my Omni 6 after it has been on for a while. When I first turn on the rig, I get an s meter reading of s-2 to s-3 on antenna noise
What I did to my Omni 6 is pull the speaker and install a small muffin fan in its place, as well as a second fan on the rf brick heat sink. A 50 ohm resistor in each fans B+ lead keeps the fan noise
If you're using DC fans, why not put the two in series instead of using the resistors? I put two 12V fans on my pegasus heatsink and connected them that way. Very quiet and they do the job. Dave, VE1
"What I did to my Omni 6 is pull the speaker and install a small muffin fan in its place, as well as a second fan on the rf brick heat sink. A 50 ohm resistor in each fans B+ lead keeps the fan noise
My mods were for a different reason.... Since I run mostly psk and other digitial modes, I wanted to get feq stability plus keeping the rig nice and cool on xmit. I didn't notice any difference in if
Actually, this wasn't an uncommon topic a few years back. Personally, I found that my PBT settings were shifted dramatically during cw contesting due to internal heat buildup. I used an external fan
I find that operating my Omni VI in CW contests a fan on the PA heat sink is necessary. My Kenwood TS-440 has a built-in fan with temperature controlled speed, or at least duty cycle. The TS-440 rec
Interesting. I ran my VI+ on a number of occasions in RTTY contests and never needed a fan on the rig. In fact, I had a Centurion amp sitting to the LEFT of the radio, which means the hot exhaust ble