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Old 22nd Dec 2019, 1:27 pm   #21
ORAWA01
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Default Re: Forgotten project - Sudden GQRP 40m receiver

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Originally Posted by MrBungle View Post
It’s definitely worth it. £6 a year and you get access to their shop full of cheap bits and a quarterly magazine full of glorious ideas

Found a picture of my current VFO creation. Mostly from aliexpress:

Attachment 195707
That's very nice. Of course, you get the benefit of freq. read out too from the DDS VFO.

Thanks for sharing.

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Old 22nd Dec 2019, 1:31 pm   #22
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Default Re: Forgotten project - Sudden GQRP 40m receiver

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The G-QRP club is a very friendly bunch. Completely free from all the politicking the RSGB seems to suffer from. I've been a member for about 36 years and know most of the active people. £6 is a no-brainer, you get a lot of value for it.

You'll find a G-QRP club stand at the Braehead rally every year, and I think at Galashiels.

David GM4ZNX
Yes, I shall definitely join G-QRP sooner or later, as recently my interest in ham radio is heading towards more of repair and restoration of old radios, and kit building stuff.

I have been to the Braehead rallies many times, but not the Galashiels yet.
Maybe see you in one of the rallies next year.

73 de Jay, GM0MOP

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Old 22nd Dec 2019, 1:57 pm   #23
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Default Re: Forgotten project - Sudden GQRP 40m receiver

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Originally Posted by Radio Wrangler View Post
The G-QRP club is a very friendly bunch. Completely free from all the politicking the RSGB seems to suffer from. I've been a member for about 36 years and know most of the active people. £6 is a no-brainer, you get a lot of value for it.

You'll find a G-QRP club stand at the Braehead rally every year, and I think at Galashiels.

David GM4ZNX
Totally agree. I’m not renewing RSGB this year. Plus I’m getting fed up of paying for ML&S and Siglent adverts once a month.
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Old 22nd Dec 2019, 2:43 pm   #24
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Let's not have a discussion about the RSGB here.

Back on topic please.
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Old 22nd Dec 2019, 3:00 pm   #25
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Yes good idea. Back on topic.

On transceiver kits I think the best bet these days is the QCX. A lot of transceiver for your money there https://www.qrp-labs.com/qcx.html . I just bought their 50W PA to go with mine for some QRO action.
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Old 22nd Dec 2019, 11:30 pm   #26
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Default Re: Forgotten project - Sudden GQRP 40m receiver

That 50W pa is astonishing value for money. Let me know how you get on with it.
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Old 23rd Dec 2019, 12:00 am   #27
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Totally agree. Especially with the solid state full QSK. I was just about to get mugged for the Elecraft KPA100 and this popped up!

It is somewhere between Turkey and here at the moment. I will post a new thread on it. I ordered another QCX as well (my filth built so far - mostly for other people) so I will probably build that first and do a thread on both that and the amplifier.
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Old 23rd Dec 2019, 6:22 pm   #28
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Managed to find a spare LC3 (26ULC) in the parts draws, and soldered it on. It works OK. Just decided to complete the kit with the rest of the panels sealed off.

https://www.youtube.com/watch?v=DxayONDoSGg

Thank you all for all the info, advice and support for this thread.
Will go for another project. But must work on the restoration of the old transceivers first.
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Old 23rd Dec 2019, 7:06 pm   #29
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Excellent result. Glad to hear you got it working
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Old 23rd Dec 2019, 7:22 pm   #30
ORAWA01
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Default Re: Forgotten project - Sudden GQRP 40m receiver

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Excellent result. Glad to hear you got it working
Thanks

40m band was really poor today. Even my Icom transceiver with outside antenna wasn't hearing much.
That Sudden 40m RX was hearing a lot more than the Icom. Quite surprised at its sensitivity.
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Old 23rd Dec 2019, 11:35 pm   #31
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Yeah they’re quite remarkable receivers considering the lack of parts. I added a 600Hz switchable audio filter to mine which cut the noise off. Well it started with 741 opamps and added more noise but was fixed later by using different ones. I can’t remember what I put in it.

Click image for larger version

Name:	FA0F3017-7193-405C-BEC5-86B684EFBFB8.jpeg
Views:	54
Size:	60.6 KB
ID:	195777

Schematic was from ARRL handbook.
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Old 27th Dec 2019, 12:13 am   #32
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Default Re: Forgotten project - Sudden GQRP 40m receiver

Yes, quite like this Sudden 40 kit RX. Very sensitive and nice audio.
Handy to do quick check on the band condition.

I am thinking of adding another variable cap. to make Band Spread function.
Tonight 40m band was in good shape, and was good fun RXing with the Sudden rig.
Also adding SEND button to mute when using it in real QSO with CW qrp transmitter.

https://www.youtube.com/watch?v=jZJWX-rtosQ
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