Comments are moderated before they will appear on the website, this is a manual process and may take some time. Please be patient.
Author Name is a required field.
Email Address is optional, but without one I won't be able to contact you back. It is never shown or linked on the website. You can always just email me if you'd rather not post a public comment. I generally reply in-line with a comment rather than email you back, unless I want to discuss something in private or off topic. Please check back to see when I reply.
Website URL is optional, if supplied the Author Name will be hyperlinked to this URL.
You may use wikitext in the body, preview may be handy here. Don't worry if you can't figure them out, just give me a hint what you want linked to what and I'll do it during moderation. Wikitext is not BBcode!
Spammers: Please don't bother wasting your time scripting up posts to this form. Everything is moderated, your post will never be seen on the web even transiently, there is no way to even view it by its internal ID, it will never be indexed. I will simply delete your post in the moderation interface. If I'm your target audience you're really on the wrong track; I'll never click on a URL in your garbage. The post content is not emailed to me (and I don't use a Win32 mail client anyway), I view the posts in plain text in the moderation interface so no clever tricks of any kind will make anything you type be interpreted by anything other than me, a human. Just give up and go elsewhere please!
15th September 2011 13:11
Alan,
I built the receiver ugly style very similar to the picture you show. However, I can't get the oscillator running. I've double checked the wiring and it is correct. Any suggestions will be appreciated.
Also, I used a FT37-61 15:3 transformer for L2. I supposed that will be OK. I have a DTC 10 MHz bandpass filter I am going to put ahead of the input once I get the receiver running. I also used 2N3904s instead of the CA3046.
3rd July 2011 21:18
Bert,
It is not extremely sensitive, but for most signals on HF shortwave bands it is fine. It doesn't take too many components really, only a handful of transistors and passives.
Regards,
Alan
20th May 2011 00:27
Hi Alan,
This is quite an interesting and attractive receiver with an output for frequency counter. I am so tempted to build one too, but I can't waste my very-limited components on this, if it turns out to be a bad receiver(eg lack of sensitivity).
I have a question, is this receiver sensitive like all other regenerative receivers? I have never built receivers other than regenerative ones.
30th January 2008 13:25
Any old rectifier should be usable as a varactor in this circuit. I used the 1N4007 because I have hundreds of them, but even a LED should work fine.
You could use a real varactor, like the MV209 available from Kits and Parts, but a power rectifier is a whole bunch cheaper and more common. For this particular receiver you only need a bit of fine tuning, the trimmer does the bulk of the tuning.
30th January 2008 12:58
Again, thanks for publishing a review of this.
I am going to get the 1n4004 diodes for the varactor application.
thanks,
73 de va7aax
29th January 2008 16:29
Thanks for that information Nigel!
Do you happen to know if the ABC or other broadcasters use precision clocks for their TV and FM carriers?
29th January 2008 14:37
Radio Australia at Shepparton uses a rubidium standard to lock each tx's synthesizer. Within the limits imposed by hf propagation it should make a fairly good reference. 5995[14-18UT], 6020, 9580, 9590, 13690 & 15240 kHz are good choices for s-e Australia
The RA broadcasts from Brandon (5995 kHz[08-14UT], 9660 and 12080 kHz) run from TXCO synthesizers - not as good as a rubidium, but ok for checking the bench DFM.
20th March 2012 10:01
Chuck wrote...