uSDX+ | 8 Band SDR | SSB/CW QRP All Mode HAM Transceiver | Output Spectrum measurement | Tek 495P
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- เผยแพร่เมื่อ 1 ธ.ค. 2021
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uSDR uSDX+ Plus V2 Review 10/15/17/20/30/40/60/80m 8 Band SDR All Mode HF SSB QRP Transceiver + 4000mAh Battery
Hello Guys, thanks for tuning in to my channel!
Spectral purity check: This is an output power and spectrum measurement of the new 2nd version of the Chinese uSDX-plus - labelled as uSDX+ SOFTWARE DEFINED RADIO.
There are a few hardware and FW issues - as explained in the video.
It's probably a budget friendly trx for SOTA, POTA, or any other portable activities.
Please check out the original work of DL2MAN
Spectral Purity measurement - done with a supply of 13.8V DC, and 50 Ohm (50W) dummy load . Current was not measured.
Frequency | Power o/p | Reference (dBm) | Harmonics (dBm)
3.7MHz 3.9W -11.6dBm -50.4dBm
5.3MHz 4.9W -7.6dBm -50dBm
7.1MHz 5.1W -5.1dBm -51.2dBm -47.6dBm
10.136MHz 4.3W -3.2dBm -46.4dBm -48.4dBm
14.074MHz 5.1W 0.8dBm -40.4dBm -39.6dBm
18.1MHz 3.9W -0.8dBm -44(spur)dBm -38.4dBm
21.074MHz 5.3W -5.6dBm -54dBm -47.2dBm
28.074 4.5W -4.4dBm -48.2(spur)dBm -52dBm
Please check out the same measurements done using a TinySa:
Thanks for a useful test, power levels and harmonics better than I was expecting!
Thank you !
Thanks for the testIng. Nicely done. It is not a Yaesu 818ND which is over 5x the price. But for a $120 HF multi mode transceiver, this does not look all that bad.
I'm playing with another version of the same design & am suitably impressed. I had a previous "brick"/controls-on-top model that proved interesting but needed some, well, work. This uSDX+ looks interesting & I may yet spring for one once we get past the Gringo Christmas infatuation. Having the battery built in is a pretty spiffy idea. One less thing to drag to SOTA/POTA activations ;-) Thanks for the video. Looking foward to your videos on the spectral purity & whatever else you find interesting. 73 & stay safe & well de W8IJN
Hi Prem, Have you noticed voice distortion or carrier being transmitted just under the voice when using SSB? I currently have thw micro sdx and it makes my voice sound robotic. . Thanks for your video. Cheers
Would be very interesting to see this test repeated with the (tr)usdx rig. The SSB TX distortion is it seems a limitation of the design, not a flaw in Chinese units.
Wow very professional review thank you for sharing WP3VU
Prem.. thanks for the great video. Do you or anyone know what type cable is needed for CAT to USB PC? Any inro on a Manual? my 12 year old purchased one and heeds help Thanks 73..Greg
Would you recommend this radio to a new ham getting into HF? I'm interested in QRP digital modes specifically. Thanks!
I heard from Tech Minds that, at least on his unit, the received audio was terrible via some type of distortion or interference and that the carrier was not filtered out of SSB.
Not a bad radio for the price, Wonder if some of the problems you were seeing were "Software issues?"
They are shipping to US and Europe only these days. I placed orders with 3 suppliers, all got refunded. How do you find the TX audio, some people say it's scratchy.
Hi Prem, I'm from Canada too. I ordered mine today and I'm looking for manual/datasheet. Do you have any link from what I can get info? Thank you for your excellent video. -- 73
Well, unauthorized Chinese copies use to have such bugs… what was the span you used on the spectrum analyzer? I saw much worst results with other uSDX rigs from China, but I ran my test with at least 50MHz span
how did you do it can you share with me , thank you
how much duty you paid for this product Import ?
I have one and the max power I get is 1.8 watts and that’s when connected to 13.8 volts.
@Prem From where to Buy this Radio...wht is the cost.