Xiegu XPA125B HF Power Amplifier 100W with Auto Antenna Tuner G90, X5105, G1M HF Transceiver QRP Radio

Bought to work with my ICOM IC-705 QRP XCVR. The built-in antenna tuner is extremely handy. Aside from an early technical fault, it's performed well and is easy to use. When a problem developed, Leslie at Radioddity sent me a return shipping label and had a new unit delivered to me even before receiving the original. Excellent customer service!

I got it so I could operate from out of the way places. I had to order another part to match it to my 817.

Can't get full output, tuner is not that good, pain to hook up. Just get a qro rig.

It’s full proof you hook it up it’s so easy to use

Excellent amp work Ok with my Xiegu G90!!!

I have a 125B, built a PTT cable to connect the ICOM 705 to the 125B. Works great. 1 watt from the 705 gives about 110 watts out of the 125b. Does not to auto band selection. But, just a push of the button to change bands. KQ4KK

The XPA125B is an excellent piece of hardware, but there’s a *lot* of room for improvement in firmware. While it works well for my use case, it might not be right for the next guy. It should also be mentioned that a processor-controlled 100W 160-6m amp with integrated ATU at this price point (I paid $549) is pretty incredible.I researched the XPA125B extensively prior to my purchase, and I recommend that others do the same. Hams with proper lab instruments have done the hard work of independently measuring and documenting harmonic output, etc.The XPA125B’s build quality is excellent, typical of other Xiegu products (I’ve owned X108G, X5105, and G90 transceivers). However, the lack of a fan on the amp’s massive heat sink means high duty cycle operation can benefit from additional cooling. An inexpensive 12V pc fan works well.Protection circuitry/software are also excellent: SWR, current, voltage, temperature… the amp is well-protected from external malfunctions and operator error.I’m driving the XPA125B with a Hermes-Lite 2 SDR. ~1W produces 80-90W on 40-15m. The internal power metering is a bit slow for accurate SSB PEP readings, but works well for digital modes.The XPA125B’s output varies from band to band at the same drive level. This would be irritating if my radio/software didn’t save per-band settings, which it does.The XPA125B rear panel sports a 1/8” serial port, and an FTDI usb cable is included. Unfortunately, these are limited to firmware upgrades, and none have been released to date. The addition of CAT, or even basic terminal control, would be very much welcome. Instead, I switch bands remotely via an Arduino Nano connected to my pc, and I’m working on an interface to allow the amp to track Hermes-Lite band changes.I have an existing ATU at the base of my antenna, so I only tested the XPA125B’s ATU briefly. I don’t like that there’s no way to adjust the max SWR which forces an auto tune cycle (it’s fixed at 3.0), but the ATU works well enough otherwise. Tuning is quick and wide-ranged (Xiegu claims 14-500Ω, seems wider) For me, the inclusion of an ATU is more of a potentially useful gimmick than anything.It’s my understanding that the XPA125B isunable to switch its relay quickly enough to support QSK CW. This may be fixable in firmware. This would be a dealbreaker if I were a CW op.If you can make do with its shortcomings, the XPA125B is a solid piece of gear at an unbeatable price. Feature-wise, its nearest competition costs twice as much or needs to be built from a kit.

I purchased my XPA125B directly from HRO months ago due to supply issues. I am mainly interested in using it for 10 meter portable/battery operation, so this fits in well along with my G90 and a (required) CE-19 interface. A few observations while tuning a 10 meter magloop; An AM carrier of 1 Watt produced about 70 Watts out. AM carriers between 2-5 Watts produced about 85 watts out, the Amp reading on the XPA125B was at 11 Amps. I suspect that SSB power will be much greater, I have no reliable way to measure PEP so I will leave it at that. I would like to see a more detailed spec sheet on this thing, but, what the hey, it is a respectable amp for the price. It does have PTT capability so It should work with any QRP rig. You will need to research the connections, it does come with a good supply of interface cables.

Testaufbau ist ein Icom IC-705, 30 A Netzteil, Bird Wattmeter, 500 Watt 50 Ohm Dummy.Die Ausgangsleistung ist jeweils bei 5 Watt Eingangsleitung gemessen.160 Meter = 94 Watt80 Meter = 85 Watt40 Meter= 112 Watt20 Meter = 97 Watt10 Meter = 76 WattDer ATU ist sehr gut und passt meine ZS6BKW, über einen Balun für undefinierte Impedanzen, gut an.Letztendlich ist es unerheblich ob 100 Watt oder 85 Watt, aber ich bezahle für ein Gerät mit 100 Watt und dann erwarte ich die Leistung auch. Geht leider zurück.Vy 73 de DL1BAX

und Antwort beekomme ich auch nicht vom Verkäufer ( radioddity ) 29.10.2021 zu 01.11.2021 11 Uhr _ ich musste mir also ein neues ACC-Kabel selber anfertigen 6Pol-Minidin zu 8Pol-Minidin !!! Gerät-ausschalten geht auch nicht wie es sein soll : bei on/off kann man 1Std. drücken da passiert nix _ ! 05.11.21 neus Gerät gekauft wie auch Xiegu G90 Zusammenschaltung geht wieder nich falsches ACC Steurkabel es ist zum kotzen ! Radioddity antworten nicht mehr _ keine Problemlösung _ kein neues ACC-Kabel welches passt _ dabei steht in der Beschreibung extra für Xiegu G_90 ! ! ! das ist NOTE 6 / UNGENÜGEND *** meine Einstellungen am G_90 mit XPA_125B : PWR 2Watt, Mic-Gain 10, CMP > on *** ( mit Grundmann Electretmikrofon )

Lieferung nach Bestellung verlief völlig normal. Bei der Erstinbetriebnahme trat ein kleiner Fehler auf (Ein-Ausschalter reagierte nicht). Die anschließende Kommunikation mit dem Distri war sehr gut und Ergebnis-orientiert. Es wurde direkt auf mein Problemchen eingegangen und wir konnten zügig eine Lösung finden. Also 5 Punkte für das Produkt und auch 5 Punkte für den Distri und die Abwicklung im Fehlerfall.