Tecsun R-9700DX Radio Compared

I’ve hesitated to talk about the Tecsun R-9700DX radio much because while other reviewers like it, I was disappointed, and I didn’t want to bad mouth a radio unfairly. In this article, I’ll also refer also to my vintage Panasonic RF-085 receiver that I bought around 1985.

Panasonic RF-085 radio (left) and Tecsun R-9700DX (right)

I’ve been listening to shortwave radio for a very long time, and I have owned over 100 radios. What I expected from the R-9700DX was a good example of where analog technology had reached in the 21th century. I expected to be impressed but I wasn’t.

Let’s start with sensitivity specifications. Here are the values for two radios:

BandTecsun R-9700DXPanasonic RF-085
MW< 1 mV/m200 µV/m for 50 mW Output
FM< 10 µV 3 µV for 50 mW Output
SW110 µV for 50 mW Output
SW28 µV for 50 mW Output
SW35 µV for 50 mW Output
SW< 30 µV
Radio sensitivity specifications

That doesn’t help much because the Tecsun doesn’t specify a standard, and the Panasonic uses an uncommon one. I’ll assume the Tecsun is using S / N = 26dB, something quoted by Tecsun for other radios, and if so, the R-9700DX lags behind Tecsun’s DSP-based radios like the PL-330 and its digital display analog radios like the PL-660, both with 20 µV on SW and 3 µV on FM. MW is the same 1 mV. My personal observation is that the R-9700DX isn’t particularly sensitive. I get 7 MW daytime stations (weak signal area) on the R-9700DX, 12 on my Tecsun PL-660 and 20 on the Panasonic (that blows everything else away on MW). I mistakenly thought that a big heavy radio would have a big ferrite antenna and have good MW reception, but it really doesn’t. Shortwave performance was mediocre too.

Tuning range is a consideration. The Panasonic tunes from 2.3 to 18 mHz in 3 contiguous bands. The Tecsun covers 3.9 to 21.85 mHz in 10 non-contiguous bands; while the tuning range is larger, there are gaps between the bands on the Tecsun, so it’s a bummer that it can’t receive WWV on 10 and 15 mHz or CHU on 3330, 7850 and 14670 kHz, while all are there on the Panasonic. And what about MW? I can excuse the Panasonic for its limited MW band given its age, but how could a modern radio not cover 1620 – 1710 kHz?

I found the R-9700DX tuning knob stiff, but without noticeable backlash.

I told myself once that I would never buy another radio with an analog dial because it’s hard to identify a station with only an approximate frequency. This radio is not only analog (and approximate) but also inaccurate. A detailed test of all the bands (using a signal generator and frequency meter) found some of the frequencies were just wrong. The video following is a booming signal on 11930 kHz from Radio Marti (pretty much the strongest daytime SW station here) around 18:15 UTC with the Tecsun’s whip antenna. You can look for yourself, but I say the dial is not accurate (SW6 band) for that frequency. The dial pointer is above (lower frequency) than the 11.9 mark.

Radio Marti on 11930 kHz – Tecsun R-9700DX

On the plus side, the Tecsun has a “big radio” sound and is pleasing to listen to for music on FM. It has a nice warm vintage dial light. It has a Local/DX switch. It comes with a power supply, case, manual (half a sheet of paper printed on both sides), earbuds and an external antenna. Both the Tecsun and the Panasonic have connectors for an external antenna and both can use it on MW.

I went outdoors in mid afternoon and hooked my 20-foot wire up a tree (WUT) antenna to the radio’s external antenna jack. I switched to SW3 (49m) and tried to find CFRX, Toronto, on 6070 kHz. What I got was very strong SSB transmissions all over the band. CFRX was not to be found. Figuring the radio was overloaded because those signals were not really on those frequencies, I flipped the DX switch to Local and got basically nothing but noise, no CFRX. Then I disconnected the external antenna and tried the whip antenna alone. That got a decent signal from CFRX. Then I clipped on the long wire instead of using the antenna jack. The SSB overload was barely there and I could get CFRX.

Note: I didn’t have the overload problem (if that’s what it is) on higher-frequency bands.

[Update: I’ve been trying to receive an elusive signal from Germany, programming called “Music 4 Joy” that’s directed to Africa and the Middle East. I’ve had no success with several tries. I got it this morning, weakly, on my PL-660 and on a whim I tried the R-9700DX; surprisingly the station was there, not quite as audible as on the PL-660, but the weak station could be heard. This brings up a point about dial accuracy. If you are tuning the bands and trying to identify stations, accuracy is a big deal; however, if you know what the station you are looking for sounds like and generally where on the dial it is, finding it is not that difficult.]

For videos comparing the Tecsun R-9700DX to a bunch of other radios, check these out:

The Tecsun R-9700DX is an OK radio, but I was expecting something special. Its performance is lackluster, but I suppose reasonable for a $45 radio ($60 on Amazon). Some have suggested that the Chinese version (which I have) may not be subject to the same quality controls as the English version and perhaps uses cheaper components; this is just speculation as far as I’m concerned. Maybe I just got a bad one, but everything works, just not as well as I’d hoped. The radio was introduced 21 years ago, so who knows how many versions it has gone through in that time.

I couldn’t find a manual online, so here is a photocopied manual for the Tecsun R-9700DX, such as it is, for posterity, and for reference here’s the manual for the Panasonic RF-085.

Performance hint: the Local/DX switch applies to both the external and internal antenna.

About Kevin

Just an old guy with opinions that I like to bounce off other people.
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3 Responses to Tecsun R-9700DX Radio Compared

  1. Paul Taylor says:

    My 9700 does exactly what you said. Clip the wire to the whip and it picks things up. Plug it into the socket, and as it goes in and first makes contact, it picks things up, but once the plug is all the way in, reception drops off to basically nothing. It must surely be an error in the circuit design?

  2. Kevin says:

    I’ve certainly enjoyed the PL-660 that I’ve had for 11 years.

  3. Manish says:

    Glad to read such an accurate description of this radio. I thought I had a bad copy of the radio. The calibration of the frequency on my copy is off on the higher side. So it’s all guess work that I may be in that frequency range to catch a station.

    Agree with the sensitivity too. It’s a great radio for FM and targeted A?/SW stations.

    On my PL 330 I can just about catch 1800 UTC BBC AM 1413 MHz roadcast targeted at iran and Afghanistan from its Oman transmitters. I am in Mumbai across the Arabian Sea and hence 1000 nautical miles of sea makes it a fine catch. The 9700DX doesn’t register this even faintly..

    Same for booming China Radio International English or local region languages of South Asia. There is nothing DX about this radio and the noise floor is way too high.

    I’ve kept it for nostalgia reasons only that it is an analogue dial and analogue inside radio.

    My tecsun 880 and xhdata 808 and the humble nifty 219 perform way better.

    I think I’ll get a 660 for a digital analogue experience.

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