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 CW Tranceiver 
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Post CW Tranceiver
Spent a couple of hours starting the assembly on the QRPlabs CW tranceiver.

Bought the kit as 17m, thinking I can use the low pass filter on 20m and make it dual band.

Interesting at the price is low, and the specs are better than most other kits.

Now the time consuming part of the inductors, but that is for another week.

Attachment:
qrp17.jpg
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The kit is extremely good, as are the instructions. So far I have a 10k pot instead of 100k, but I will have to look at the website and see if that is intentional, ans one 1n capacitor missing.

I haven't put any controls and sockets on yet, as I haven't decided how it will be boxed, and maybe the sockets and controls will be on the box and not on the board.

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Sun Jan 14, 2018 5:08 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
I made the 40m one. World superbly.

D

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Sun Jan 14, 2018 5:48 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
i would be interested in a running build report, thks


Sat Jan 20, 2018 10:35 am
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 CW Tranceiver 
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Post Re: CW Tranceiver
Yes the 10k trimmer is for the contrast of the LCd display 100K was found to be too large making it difficult to set the level so 10K is better.
Also the inductors are 47uH now. you may want to fit L5 between pin 7 and 20 of the pic chip as it helps with the radio starting up or just a blank screen. I had this common problem sadly the original L5 died on desoldering luckily my spares box had a couple stock.
Im only getting 2 Watts at the moment on 20m which is probably down to my coil winding. Just waiting for my LCR meter to arrive so I can check them.
Overall it works well and has lots of features.

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Sat Jan 20, 2018 11:33 am
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 CW Tranceiver 
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Post Re: CW Tranceiver
Wound the coils today, tested it with current limiting on the PSU without ICs, then added the, then the CPU, and finally the display.
Only draws just over 100mA, not bad considering the display and CPU.

Still deciding how to box it, and how to switch between 17m and 20m, I don't like boxes with controls/connections on all sided, so haven't fitted the controls and sockets to the board yet.

I found the trimmer details on the FAQ, so far it has started up every time I have powered it up.

I think it is only L4 that would affect the power output much, unless the low pass filter was miles out.
I'm hoping that if I tune it to around 16MHz, it will give me about the same power on 14 and 18MHz, it shouldn't be too critical. Otherwise I will have to switch that too.

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Sat Jan 20, 2018 4:22 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
Getting 4W out on 20m and 17m, so happy with that. (on 12V)

Probably will do the switching of the RX input with a plain toggle switch.

Thinking of having all the plugs/sockets and controls on the front panel (ie where the display is), with the exception of the DC power lead, as that would be the best for portable use, which I should think would be its main or only use.

The whole design of this makes other similar project look very stone-age, very clever.

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Sun Jan 21, 2018 12:14 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
Here in Salisbury we have put them.in checknese silver metal boxes. They look good, switch, knobs, jacks etc. Look like proper rigs ha ha

D

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Sun Jan 21, 2018 1:08 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
G4YVM wrote:
Here in Salisbury we have put them.in checknese silver metal boxes. They look good, switch, knobs, jacks etc. Look like proper rigs ha ha

D


That is the other alternative, make the display at right angles to the board and all controls on the front, may be add an antenna tuner (very simple for just two bands). Would be nice for the shack, but not so good for portable.
Would also add an amp and speaker if I went that route.

Any way, not doing any more until I have decided. Only want to do it once.

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Sun Jan 21, 2018 1:20 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
G4YVM wrote:
Here in Salisbury we have put them.in checknese silver metal boxes. They look good, switch, knobs, jacks etc. Look like proper rigs ha ha

D


Hi David
Where do you get those boxes from?
ray G3XLG


Sun Jan 21, 2018 4:31 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
Sorry.not checknese. Chinese.

I'll find a link

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Sun Jan 21, 2018 5:26 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
https://m.ebay.com/itm/Split-body-Extru ... mwBanner=1

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Sun Jan 21, 2018 5:31 pm
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 CW Tranceiver 
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Post Re: CW Tranceiver
G4YVM wrote:
Steve,

Are you building one dual bander or one each for two bands?
If it's a dual bander how have you modded it,?

Or are you building that most violent of rigs, the duel bander???

D



Dual bander.

Not much to be done really, built the LPF for 17m, which will be fine for 20m

The only thing that needs a different value on transmit is L4, which works fine for 17&20 as is

On receive, it is only the input circuit that needs changing, I added five more turns to the 17m windings, then switch in a variable capacitor for 20m (which is about 10pf, so a 20pf trimmer works fine)
I was going to use a miniature relay but will probably just use a toggle switch. Saves 10mA on the relay.

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Wed Jan 24, 2018 8:59 am
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 CW Tranceiver 
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Post Re: CW Tranceiver
Ah very good. I look forward to reports

D

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Wed Jan 24, 2018 9:50 am
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 CW Tranceiver 
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Post Re: CW Tranceiver
Decided to make it straight forward, and put in a box as suggested earlier.
If I decide to keep it (seems though that most things like this, I build, try for a while, then get rid of) I can change the box later.

Now just got the cutout for the display to finish and the end panels.

Enclosures take longer than the building :) No wonder finished products cost so much more.

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Sun Feb 04, 2018 10:22 am
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 CW Tranceiver 
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Post Re: CW Tranceiver
Nearly there, just the band switch now.

Attachment:
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Sat Feb 10, 2018 9:46 am
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