Thanks for posting this link and information, I have downloaded this and will have a play around with it. Paul -- Paul - Moderator UltralightDX

Thanks Andy, Yes, I have been bitten by the forged chip syndrome. I bought what I thought were two seven band audio spectrum chips but, for the life of me, could not get them to work properly. They

Thanks Guys, Photos on the FaceBook show exactly what I am looking for. The problem is that the product seems to be discontinued from the usual sources but, at least, I now know that it exists. I

Hi Max, You have opened an Aladdin's cave for me. I have not studied each sheet (yet) but have scanned a few and found the KT0936m to be quite interesting because of its sensitivity. I will put

For those getting serious about "wire" antennas there is some free antenna simulating software that I have used and found to be quite good. It will calculate rabbit-ears, beverages, yagis, whips,

Hi Ray, Andy -- Ray, there an active Facebook group called "Si47xx For Radio Experimenters". Several guys already sharing their buildings and tests. I'm sure you can ask questions there and the member

Here i uploaded some datasheets for radio ic with mechanical tuning (do not need to program a MCU). http://maximradio.altervista.org/datasheets/ They are from KTmicro, AKC Technology and Silicon

Hi Ray, I can't find my notes right now to give you speficis, but be aware that many of the chips shipping from china are old versions, and many of the breakout boards and modules don't bring all of

Hi All, I would like to try my hand at using a MCU such as an Arduino to control a Si4735. Si4735's are available on eBay Australia 5 for $US7.14 ($AU11.55), but they are SSOP packages. My old eyes

Thanks for the reply Kevin. I aim to undertake some more testing of this when I can get outside. -- Paul - Moderator UltralightDX

i tend to prefer rabbit ears myself as they are easy to rotate as well as position the antenna elements at different angles to aid reception - either flavor, HD or non-HD for those that care about

If you are in DIY RF and Arduino, you may look at this project: https://github.com/pu2clr/SI4735/blob/master/README.md There's a list of receivers using the SiLabs Si4735. Si4735 is a formidable chip,

https://ultralightradiodxing.blogspot.com/2020/04/an-introduction-to-ultralight-fm.html -- Paul - Moderator UltralightDX

Over the past few days, I have been testing a few different low cost / simple aerials for use on the FM broadcast band (87.5-108MHz). All these aerials have a cost of under $10, the idea of this

Thanks Peter, I've had a quick read of the AN400 document and couldn't see an external varicap listed on the BOM's. I'm guessing the varicap might well be on-board the chip, which may be another

hi all, just curious, what group is this? i'm in lockdown like many others, and am looking for groups like this wonderful one hence my question :) Majid -- kind regards, Majid Hussain

The radio is on a chip. You put power in, RF in, get audio out. Everything is done by the chip. Your only job is to tell the chip what you

Hi Lamont, I have just ordered 10 x 500pf varicaps via ebay.co.uk to use in (I hope!) a varicap tuned indoor frame loop. They only cost 1GBP from China, of course. There were many other vendors

Maybe I need to refine my question a bit. The discuss was about if a radio is designed today, will it incorporate a receive chip.  It all started with someone saying Varicap availability is

All digital radios use DSP chips, but Tecsun's analog radio's also use an Integrated Circuit. Specifically, that I know, are the R-911 and R-9012. These use a CXA-1622B chip IIRC designed by SONY.