QDX digital transceiver

This digital-only transceiver from QRP-Labs is really tiny. It can produce 5W, but I have added diodes in the power lead to ensure the RF PA is working without being stressed. This reduces the power out still further, but makes very little difference.

See https://shop.qrp-labs.com/qdx .

10m QRP FT8 (Friday)

Change of plan!

I think my SignaLink USB (or lead) has developed a fault after over 20 years. After a brief period on 10m WSPR with my beacon, I am on 10m QRP FT8 with the QDX.  At 1031z, I have been spotted by 91 stations. 

The QDX is about the size of a pack of cards i.e. tiny.

Also, I am having issues booting up my QMX+ rig today.  It  keeps coming up with a dim display and not initialising. 

Without the SignaLink interface or QMX+ I am unable to use FT8 at 8m or 6m, which is a pity. I suppose I could use the IC705 at 6m for FT8. At present I was using the QMX+ for 6m and the FT817ND (dealer modified) for 8m.

UPDATE 1415z: Spotted by 303 stations on 10m FT8 TX. See map.

10m QRP FT8 with the QDX (Sunday)

My gear was turned on at about 0845z. At 0912z spotted by 47 stations.

UPDATE 0922z: Puzzled why I was seeing no RX spots of mine on PSKreporter and the RX spectrum looked all "watery" and indistinct. I reset the QDX and PC and all was well again. Not sure if it was the QDX or PC. 49 spots on RX and 58 spots of my QRP FT8 on the QDX.

UPDATE  0952z:  79 spots of my QRP 10m FT8 so far, See map. Think I should QSY to 8m.

QDX and newer Windows 10 PC : all working

Stations spotting me on 10m QRP FT8 earlier with the QDX

Just now, I tried my QDX on FT8  with my "newer" Windows 10 PC.  Thankfully, all is working just fine. 

I may try Linux on the older PC, but on the one I am using I shall just leave well alone for now on the principle of "if it ain't broke don't fix it".

QDX and QMX+ issues

 With the "other" Windows 10 PC, everything seems to work on RX, but even though the QDX goes to TX there is no RF being sent. Also, I get a "rig control error" going to TX even though the CAT works and it is "seeing" the QDX. As far as I can see, everything is correctly set and I tried a power cycle on the QDX before starting the PC.  It should not be this hard.

Going back to the SignaLink USB and FT817ND I get no issues at all with the "old" PC. For now, I give up.

Friday plans

We have to go shopping, but I also want to find out if the PC or QDX is the source of my problem with the QDX not being recognised by the PC. As far as I know, everything is done in the correct order. 

It will be interesting to see if I get no problems with the FT817 and SignaLink USB. This has never given me problems in over 20 years . 

Assuming I can find a solution, my plan is to try 10m QRP FT8 later. We'll see!

UPDATE 1153z:  I shall be tackling the QDX and PC after lunch. Wish me luck!

UPDATE 1455z:  No luck. It is as if any external device is not recognised. Just to make sure the USB socket is OK (I think it is) I shall try a CF drive in it. For now, until I can fix this, I am confined to 10m WSPR. Somewhere I have another Windows PC that I must try without updating it just in case it is a Windows Update  that has screwed things.

UPDATE 1540z: I found the older Windows 10 PC. It is on charge. Later I shall give this a try.

Sorting out the QDX and PC

 As we are out later, I think working on the QDX and PC will have to wait until Thursday now.

Plans for Wednesday

 Later this afternoon I hope to sort out my PC and QDX. As you know I had planned to do this earlier in the week, but events overtook this. 

Assuming it all works and there is no thunder (!) I shall try 10m QRP FT8.

QDX videos

There are lots of videos on YouTube singing the praises of the tiny QDX digital transceiver from QRP Labs. This is just one as an example. It really is tiny and for many it will be all you ever need on HF.

Yesterday

Yesterday I planned to sort out my PC and QDX. Instead I helped someone else with their PC and service provider. Can you imagine someone who is more ignorant about PCs than me!!? They exist! Later today I hope to do what I hoped to do some days before. 

QDX or QMX+?

Both these QRPlabs products are excellent rigs and I have them both. 

QDX

Most of my operating is either WSPR or FT8 on either 15m or 10m. I cannot recall when I last used SSB on HF because of my poor voice. The QDX is much smaller than the QMX+, but has no display and does not include 6m. Later versions of QMX+ software promise SSB too.

Now, with my limited ability to use SSB, I am questioning if I should keep the QMX+ rig. I probably will for now, but really the QDX would do all I need in the size of a pack of cards.

UPDATE 1806z:   It has been such a long time since I used the QDX that I have forgotten the sequence in which things are connected. There is a known issue with Windows, but not with Linux. For some reason the QDX is not recognised at first.

HF QRP FT8

It is some months since I have given HF FT8 a try. I have a QDX which can give 5W FT8 from 20m to 10m. My end-fed Par antenna has a lowish SWR from 17m to 10m. 

Assuming I can get it working, one thing to try as the sunspots decline (not yet we hope!) will be to send FT8 in sequence on all bands from 17m to 10m.  I have no idea of the antenna pattern on various bands, but it might give me some indications of band openings. 

One of the things I have noticed in the past is people leave the higher HF bands. Maybe with FT8 now, some may stay around. Often it is a lack of activity and not poor conditions. On SSB an isolated call may be missed. Not so with FT8 with lots of people monitoring. 

Incidentally, I can highly recommend the QDX. It is tiny (about the size of a pack of cards) and can run all the modes on WSJT-X.

A very nice addition would be a QDX covering 10m, 8m, 6m, 4m and 2m. Even 10m-4m would be very useful.

See https://qrp-labs.com/qdx.html .

QDX digital QRP transceiver

This is a tiny 5W digital transceiver from QRP Labs. It is available in 2 versions covering the HF bands. I have had the 20-10m version for several months now, but used it little recently as 5W seems like high power! It really is small. It is about the size of a fist mic only.

If digital modes are your "thing" then this low cost transceiver is probably all you need. It is available as a kit or ready built.

See https://sites.google.com/view/g3xbm4/home/hf-mf-and-lf/homebrew/qdx

QDX QRP digital transceiver

 This tiny 5W digital transceiver is available from QRP labs. I was amazed how small it is. It is available in 2 versions covering the lower HF bands or the higher ones. Mine is the higher one. With WSJT-X and FT8, it has got me all over the world despite a low Par end-fed antenna. If you only want digital modes like FT8 and WSPR this really is all you need.

QDX reviews

The place to look for reviews of amateur gear is eham.net. I was quite surprised to see that the QRP labs QDX, which is a tiny 5W digital transceiver was only 4.2 out of 5. In my estimation, it is a 5 out of 5. It is truly tiny and if FT8 or WSPR are your "thing", you really need nothing else. I must write a review.

Some people have had trouble with PAs blowing. In my case I have 5 3A diodes to drop the voltage and always use it with an antenna with a low SWR.  I can see a problem with auto-ATUs which may present a bad match during tuning.

A 6m, 8m and 10m version would be good.

See https://www.eham.net/reviews/view-product?id=15155 .

UPDATE 0615z Monday:  Review written. 

Tomorrow 10m FT8 QRP

In view of the (low) activity levels on 8m this Es season, I propose to concentrate instead on 10m QRP FT8 using my little QDX transceiver.

QDX-M 630m - not yet!

Following a recent email from Hans it is clear they are concentrating on the 160m version first. The 630m version could be some time, as the toroids on the LPF will need lots of turns! Judging by the results of the higher band versions of the QDX, I have no doubt the 160m and 630m single band versions will be very good.

QDX transceiver

This is a tiny, digital only, HF transceiver that may be used with free software like WSJT-X or JTDX.  It is available in a version for the lower HF bands or 20-10m. Most people buy it as a kit, but I bought mine ready-made as my soldering skills are poor these days. Years ago my fine motor skills were very good. My wife once said that I could write the Lord's Prayer on a postage stamp. She was probably right!

It produces 5W and is very small.

With the popularity of digital modes, this is all most people really need. It works extremely well. Hans makes some excellent pieces of kit.

Mine is regularly copied all across the world on a very basic antenna.

See https://qrp-labs.com/qdx.html .

New page on website

For the last month or so, I have been having great fun using my tiny QDX digital transceiver from QRP Labs.  I am amazed that something this tiny works so well. If is so much smaller than my other rigs!  A webpage has been created. 

Mine is the version covering 20m to 10m. Other versions are available.

Just imagine a good multi-band transceiver with case with change for less than $100. Every amateur home should have one! If your soldering skills are normal this should be a straightforward build.

See https://sites.google.com/view/g3xbm4/home/hf-mf-and-lf/homebrew/qdx

10m QRP FT8 with the QDX

Since breakfast, I have been on 10m FT8 with the QDX QRP rig. 16 spots of me so far with the furthermost H44MS (14814km) in the Soloman Is in the Pacific. I think this genuine too.

UPDATE 1824z:  65 stations have spotted me so far today (see map).