SW-3B QRP CW transceiver

(16 customer reviews)

$188.00

 Note: Since current quality of SI5351 is not stable,we”ve changed the DDS chip from Si Lab’s to ADI’s,we have birdy issue on some frequencies with new design,we might change some diagram or make a new case to eliminate the birdies,stay tuned.

 

Three-band CW QRP transceiver

 

 

 

Download Manual here

Technical document complied by KL7KN

 

 

The radio comes with Power cord(4.0 x1.7mm DC jack) and SO239/BNC adaptor.

 

Clear
SKU: N/A Category:

Description

Dimensions: 104*71*25mm (excluding the protruding part such as knob)

Weight: 180g.

Operating voltage: 8-15VDC.

Operating current:

receiving: about 45mA(backlight on), and less than 40mA(backlight off).

transmitting: about 0.8A (at 12V voltage).

Frequency range: 5-8MHz, 8-11MHz, 11-16MHz (the receiving sensitivity peak is only 40m, 30m, 20m amateur band).

Transmitting: 7.0-7.2MHz, 10.1-10.15MHz, 14.0 -14.35MHz.

RF output: 5 watts @12V

1.8 – 2 watts @9V

 

(

We’ve been using DDS chip Si5351 in the SW-3B’s with good results,but recently we could not find any good quality Si5351’s on the market,many of the chips fails in short time operating.

 

Recently we’ve channged the DDS chip from Si5351 to AD9834,which seems good.Unfortunately,due to different MCU data format,it seems cause some birdies on the particular frequencies mostly on 40m.

 

And Si Lab informs they are manufacturing Si5351’s in October,so at this point,we are focusing the new SW-3C,which is also a 3 band QRP CW tranceiver with a bit more features and different case,we should have SW-3B back in October as well.  

)

 

Schematics for reference.

 

 

 

 

 

See more photos and talk to other owners by joining the group:

https://www.facebook.com/groups/2208133992821820/

 

 

Additional information

Weight 0.4 kg
SW-3B shipping method

Ship using DHL/FedEx, Ship using Post

16 reviews for SW-3B QRP CW transceiver

  1. alainf8feo (verified owner)

    Excellent small radio !
    I made several contacts today 17/11/2019 with a simple long wire (10 m) and a small tuner 15/40 m
    on 3 bands 599 : (Poland,Croatia,and Ukraine) from my garden in SE France
    I want try it in Sota and made a lot of qso !
    Alainf8feo

  2. José Gomes / CT7AFI (verified owner)

    Received it in 10 days from the manufacturer.
    Small and effective 3 Band QRP rig and very well built.
    Powered with 12 volts and coupled to an end fed antenna, made 3 QSOs with USA today.
    Nice price as well !
    Recommended !

  3. Don – WA2SWX (verified owner)

    Received it in good time. Attached it to an EFLW and worked several stateside and four european stations in short order. Sensitivity was good and power levels were on the mark. Control layout was clean and their use relatively simple. Great price point for what you receive. This will be going with me on the road.

  4. Yvon NU6I

    I had a MTR-3B that I loved but after receiving and operating the SW-3B I sold it.
    The MTR-3B is a great radio but the SW-3B is so much superior. Can be powered by more than 12v unlike the MTR-3B, selectivity is much better and has AF gain control, no need for an in line volume control. And it is more than $100 cheaper.
    This evening I was listening on 7114. Had a LSB station a little lower and a cw station slightly higher that sounded like a keyed oscillator from the 60’s. Still I was able to copy the cw station on 7114 I intended to work.
    I work mostly cw QRP and have many QRP radios including the KX2 but this is now my favored one.
    Support from Dale is outstanding.

  5. Ilya R3XA (verified owner)

    Nice little rig! Quick delivery & good packaging. Thanks Dale!

  6. Александр R0LHE

    Доброго всем дня!!!!!!…….я ещё только собираюсь приобрести данное QRP радио…..читаю отзывы аладельцев……и я уже понимаю, что я нахожусь на правильном пути!!!!!…… Всего хорошего!!!!!!!…..

  7. Alan Shapiro (verified owner)

    Beautiful rig for SOTA. I’ve had it out on 4 activations and am very pleased with it’s operation, controls, display, keying, and receiver.

  8. Lloyd K3ESE (verified owner)

    I really enjoy using this rig! it’s my favorite rig, ever, for portable QRP ops, and I’ve owned, and used, many.

    Delivery from China, pre-covid, took 19 days.

    Mine puts out 6W on both 20 and 40m, and 7W on 30m.

    Best DX so far was Australia, from Florida, USA, on 20m.

  9. Peter OE1OPW

    Made 310 QSO’s in the CQ WW WPX Contest during 7 hours with a SW-3B and an Endfed Antenna only 7m high. Nice rig with really 5W out. I use it with 13.8V. With this rig QRP operation make fun. Only the change of the CW speed is a little bit tricky.

  10. Mike WO9B (verified owner)

    Recieved my radio in late Feb. Been using it for QRP field ops weekly since, wx permitting. Been operating the CWops CWT’s so you know there is lots of activity. 400 hz bandpass works out fine. The AF/RF adjustments are a very nice feature. I power it with a small 1.1 Ah LiFe battery.

    This will be my radio for Field Day 2020. Heading out to a forest near Lake Superior. Looking forward to a wilderness Field Day.

  11. Wesley Matthews (verified owner)

    I second all the positive reviews above. My longest contact was France from Pennsylvania on 4.6 watts using 11.1 volts. Output is much higher than advertised. My power out at 13.8 volts was even higher than K3ESE stated above. 8 watts on 30m. I accidentally tuned for at least a minute without the antenna switch on the right rig and did zero damage to the radio. I wouldn’t test it again on purpose, but it’s very resilient and beginner friendly. Filter width is ideal. Paired with a resonant ended half wave, this is an unbeatable rig for portable ops. Just so capable for it’s tiny size and weight…and the cost….super budget friendly.

    I own or owned at least 10 small QRP rigs and this is by far my favorite.

    Wes
    W3KW

  12. Georges F6DFZ (verified owner)

    I just get my radio today. The service from Dale was perfect, many thanks !
    I decided to purchase it because its schematic diagram is similar to the proven Elecraft KX1 and because it possess a RF gain, a necessity with rigs using AF AGC.
    This rig is tiny and cute and construction is top notch.. MDS on all bands is about -127dBm, power with a 12V lead battery is 5W, frequency is accurate.
    Full break-in is smooth, ergonomics are good.
    First QSO’s were very pleasing.
    In brief, this is a very good QRP transceiver with well chosen bands and an attractive price.

    Georges F6DFZ

  13. Frank Leon

    It is my favourite trail rig ever. It is always in my backpack, wherever I go I take it with me. Quality is perfect, the receiver is sensitive enough and RF gain can reduce the strong signals.
    I also like the memories and the internal memory keyer. The power is enough for for most QSOs.
    Customer service is perfect, they answer very quickly.
    Overall I am so happy with this tiny “creature”. I truly recommend it.

  14. Terry (verified owner)

    When I, just by chance, discovered the ad for the SW-3B
    While giving up on obtaining a ‘MTR’, I was somewhat sceptical of its quality and support from (yet another) overseas supplier!

    Let me tell you that, so far, I have had better support and faster response than from many ‘domestic’ Companies!

    What appealed to me was the fact that it was TINY, had 4-5W TX, had a LCD Display and would run from a wide-range of DC options that I already had!

    My SW-3B arrived in about 3 Weeks after Order Confirmation from ‘Venus’ and I discovered that it is a ‘VERY CAPABLE’ (and TINY) CW Radio that you, like me, will want to take with you on POTA, SOTA or just simply outdoors enjoying ham-radio with ear-buds and a few feet of wire!

    The SW-3B will operate from an 8-15V DC Source, so that means that you can create a small battery pack from a few just about any Alkaline or Rechargeable Batteries.

    The TX Output is varied by the DC input, so you might want to use a ‘buck-convertor’ if you plan on using a larger battery (13.8VDC) and plan on running 3 or 4W or QRPp (or like the idea of saving your finals!).
    My SW-3B will happily run 5W with 12VDC!

    One of the nice features of the radio is that CW TX is capable even during USB/LSB reception and being ‘Wide-Band’ permits ‘cross-mode’ QSO’s.

    There are lots more features that are covered in the (well-written) Manual.

    Do I recommend buying this rig?

    For a Feature-Loaded 4-5W+ CW Transceiver for under $200 with excellent support…

    YES and YES!

  15. Gomes (verified owner)

    This transceiver has excellent features for portable operation. It is robust, small, light, consumes little, is simple to use, and has excellent performance.
    The support given by Dale is excellent!
    Test SW-3B vs Yaesu FT-817ND in:
    https://youtu.be/daUQAneYps8

  16. Stu W2PTH (verified owner)

    Great little radio! It works exactly as advertised, it’s extremely small…..and shipping from China to NJ took 2 day’s! (by DHL) Most importantly, however, is support and Dale is the best. All questions are answered VERY promptly. Definitely a good company to deal with! For the price of this radio, you won’t go wrong.

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