A new Quansheng which will transmit on 10,6,2,70cm.
Sounds good? Well not so much.
TLDR 2nd harmonic -15dBc on 6m.
Other bands are piss poor too.
You need a solid external filter for TX on these radios if you feel the need to comply with your license, and they are really not for use with an external antenna. (A magnetic loop antenna or a resonant match EFHW might be worth a thought for 10,6)
These radios make no real effort to filter the transmitter. Depending where you live, and your regulations, they likely are unacceptable on any band.
For reference the FCC requirements 97.307 are apparently:
-43dBC on 10m
-53dBC for a 5W VHF TX
I’ve been experimenting with a TK11-5 also.
Harmonic performance on 70cm is pretty good, ie -48dB, 2m -46dB, 10m -25dB and 6m -39dB
Not as bad as the one on your link though. Maybe they have made some changes? I wonder if there was enough attenuation for the VNA?
I used a Nano VNA with a couple of attenuators for measurements.
HF receive performance is not so good, the radio blocks badly on an external antenna. I made a 40m bandpass filter for it and the sensitivity is now good but the AGC is a bit wierd.
The use case I had in mind was hiking and listening to 40m activity while receiving on 2m simplex.
The radio is pretty deaf on 40m with the supplied little ferrite antenna. I made a telescopic whip for the HF antenna socket which receives better, but mechanically it would be easy to snap off the HF antenna plug.