Can this really save your G90? The Xiegu G90 is a great radio, but the one thing many owners find out fast is that it gets hot. That's not a defect so much as a design reality: the aluminum case is the heat sink, and Xiegu's own documentation notes that it's normal for the G90 to overheat when used for a long time. Casual SSB operating gives the radio plenty of time to cool between transmissions. Digital modes don't. FT8 and similar modes hammer the finals with a high duty cycle, and the case temperature climbs.
Enter the Radioddity G90-H1. It's part cooling fan, part angled stand, and it's designed to move air across the radio's case to bring the shell temperature down. In this test I bolt it on, see how it fits, measure how loud it is, and most importantly, put an infrared thermometer on the case to find out whether it actually keeps the G90 cooler under a real digital-mode workload.
What the G90-H1 Is
The G90-H1 is a base the G90 bolts into. Fold-out legs give the radio a head-up viewing angle, which is a genuine quality of life improvement on its own since the G90's display sits low on a flat desk. Underneath is the fan, and the fan is temperature controlled: it runs on low when first powered, and a small brass probe touches the bottom of the radio's case to read the case temperature and govern fan behavior.
That probe detail matters. This isn't a dumb fan spinning at full speed all day. It reacts to what the radio is actually doing, which means it's quiet when the radio is cool and working when it isn't.
Installing the G90-H1: Step by Step
The included instruction manual is thin, but honestly there isn't much to figure out. The whole install takes a few minutes.
Step 1: Bolt On the Side Brackets
The side brackets attach to the base with the included Allen hardware. The brackets can physically mount either direction, and the correct orientation is with them set back. The easiest technique: seat the screw on the Allen key first, feed it through the bracket into the base, snug it until the next screw is started, then come back and tighten everything down. Repeat on the other side.
Step 2: Attach the Ground Lug Bracket
A rear bracket with a latching clasp is designed to anchor at the G90's ground lug. Unscrew the ground lug a few turns, set the bracket over that spot, slide it down, and tighten the lug back up. Then fold the latching arms over and clasp them in place. At that point the radio is secured to the base.
Step 3: Connect Power
A power pigtail comes off the back of the unit and plugs in with Anderson Powerpole, so it drops straight into a standard shack power setup. The unit also carries a second, older-style connector option, the same style the G90 used before Xiegu switched to Powerpoles, so you have a choice of power sources.
The Temperature Test: Real Numbers
Marketing claims are one thing. An infrared thermometer is another. To create a worst-case-realistic heat load, I ran the G90 on FT8 for several cycles and let it heat up, then measured the case temperature under two conditions.
Baseline: No Fan
After several FT8 cycles with the radio sitting on its own, the case measured about 37.3°C.
With the G90-H1 Running
After running the radio for about the same amount of time mounted in the G90-H1 with the fan on, the case measured about 30°C.
The Difference
Roughly a 7°C reduction in case temperature under a digital-mode duty cycle. The fan is doing real work, not decorative work.
Heat is the long-term enemy of any power amplifier, and the G90's case-as-heatsink design means the shell temperature is a direct window into how hard the radio is working. Knocking 7 degrees off under FT8 load is a meaningful margin, especially in a warm shack or outdoors in summer.
The Noise Test: How Loud Is the Fan?
An honest question, because nobody wants something that sounds like an airplane in their ear while working the radio. So I put a sound meter on it.
Talking normally measured about 75 to 80 dB. Room noise with everything off averaged around 37 dB. With the fan plugged in and running, the meter read around 50 dB. So the G90-H1 adds roughly 12 to 14 dB over the room's noise floor, which is far below conversation level. You'll hear it if you listen for it, but it fades into the background during actual operating and it's nowhere near loud enough to interfere with copying signals.
About 7 degrees cooler under FT8 load, for around 13 dB of fan noise. That's a trade every digital-mode operator should take.
Who Should Get One
If your G90 lives on SSB with normal conversational duty cycles, the radio's own thermal design handles that fine, and the G90-H1 is more of a nice-to-have for the viewing angle than a necessity. But if you run FT8, WSPR, or any other digital mode where the transmitter is keyed a large fraction of the time, the math changes. Those modes are exactly the sustained-heat scenario Xiegu warns about, and active cooling is the straightforward fix.
At around $70 attached to a radio in the $465 range, the G90-H1 is proportionate insurance. It also solves the display angle problem at the same time, which is the kind of two-birds accessory that earns permanent desk space.
Frequently Asked Questions
Does the Xiegu G90 run hot?
Yes. The aluminum case is the radio's heat sink, and Xiegu notes it's normal for the G90 to overheat during extended use. It's most noticeable on high duty cycle digital modes like FT8, where the transmitter is keyed a large fraction of the time.
What is the Radioddity G90-H1?
A combination holder, angled stand, and temperature-controlled cooling fan built specifically for the Xiegu G90. The radio bolts into the bracket, a brass probe reads the case temperature, and the fan moves air across the case to lower shell temperature. It's available from Radioddity for around $69.99.
How much cooler does the G90 run with it?
In my FT8 test, the case measured about 37.3°C without the fan and about 30°C with the G90-H1 running, roughly a 7°C reduction under the same workload.
How loud is the fan?
Measured against a ~37 dB room, the fan brought the level to around 50 dB, an increase of roughly 12 to 14 dB. Normal conversation measured 75 to 80 dB in the same test, so the fan is much quieter than talking and doesn't interfere with operating.
Is it hard to install?
No. Side brackets bolt on with included Allen hardware, a rear bracket anchors at the G90's ground lug, and latching arms fold over to secure the radio. The instructions are thin, but the assembly is easy to figure out in a few minutes.
How is the fan powered?
Via a rear power pigtail with Anderson Powerpole, plus a second older-style connector option, the same connector style the G90 shipped with before Xiegu moved to Powerpoles. The fan is temperature controlled and runs on low when first plugged in.
Conclusion: It Actually Fixes It
The question in the title has a measurable answer. Under the same FT8 workload, the G90 ran about 7°C cooler mounted in the G90-H1 than sitting on its own, and the fan added only around 13 dB of noise to a quiet room. The install is a few minutes of bolt-turning, the temperature-controlled fan means it only works as hard as the radio does, and the head-up stand angle is a bonus you'll appreciate every time you look at the display.
Heat is the thing that quietly shortens the life of radios like this, and the G90-H1 addresses it for a fraction of what the radio costs. If you've noticed heating with your G90, or you're planning to put it on digital modes, this is the fix.
Have you noticed heating with your G90, and what was your solution to cool it? Drop it in the comments on the video. I read them all.