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.

------------------------- **FMDXerDB - Report** Report Date: 04/07/2020 Report Time: 10:13:27 Freq / Name: 087.6MHz - TOTE SPORTS Site / Type: Abels Hill, Launceston Tasmania - LPON Notes: Logged

Recently I have purchased a large A/B audio switch box, this is being used for direct audio / signal testing of various radios. I have mounted this in a large case and have run two 3.5mm audio

Thanks Richard. It is something that I am really interested in and enjoying.-- Paul - Moderator UltralightDX

Anything with a digital display pretty much would. Paul -- Paul - Moderator UltralightDX

"Mostly" is pretty vague. The Tecsun line all seem to be built on the Silicon Labs, maybe better known as SiLabs, chips. Silicon Labs is a fine American company with operations all over. See the

Paul: Thanks for posting the article. I’ve been FM DXing since 2010 using barefoot Tecsun ULR, primarily a PL-606. To date I’ve logged 876 stations from across North America. I have tried using