I can sort of agree.
If transmitting a 1W signal out on 10m somehow and the spur is down 30 dB,
that spur is equivalent to what we get from a 100W transmitter with a spur that is down 50 dB.
Though the relevant officials may disagree.
It's a kit, it is your responsibility to ensure your transmitted signal is clean.
Regardless of mods or no mods.
This rig un-modded can transmit on 4.5mhz, don't do that either!
Keep in mind that there is considerable variation between rigs regarding available output power,
much of this is due to gain variations in the 45mhz IF which will effect the strength of the spur.
?
Increasing the mike gain on 15-10m will increase the rather meager output power
but will disproportionally increase the spur.? So don't.
Most important, do not transmit SSB from the uBitx through a high powered?
external linear amp on 15-10m unless you deal with the spur.
Put a KW amp on it and your spur would be about as strong as a stock uBitx.
There is no problem with CW transmission on any band with regard to the spur.
Though you might check out this thread regarding uBitx key clicks:??
? ??
/g/BITX20/message/51673I'm pushing a bit here because:
? Very few here have any inclination to check the spur.
? Many would be inclined to bump mike gain up somehow to the limit where IMD kicks in (the spur occurs way before that).
? Many would be inclined to use an external RF power amp, especially on the weak high bands.
? Future versions of the rig should clean this up or it will remain an issue.?
Jerry, KE7ER
