Re: [time-nuts] GPS down converter question

Alex wrote: actually the 34MHz filter [Meinberg scheme] could be made at home, by using old 10,7MHz FM-IF filters magnetic material, once upon the time I made some 27MHz filters that way, for 70MHz is bit risky, since there is no salvageable out there Mix 67 toroid cores are what you need.

Re: [time-nuts] GPS down converter question

and use low capacitive coupling, for simple adjustment of the bandwidth the filter could be set up and tested with these HAM, stile network analyzers too, if somebody explains me how to post pictures I could show the whole process, since I am doing it often for professional designs also 73

[time-nuts] soldering QFN (was: GPS down converter question)

Salut, On Wed, 2 Dec 2015 18:39:55 -0500 paul swed wrote: > Just adding that this is home brew so no real boards. At the IF level thats > both large enough and easy enough to add to a ground plane. So its > reasonable to build the basics and add stuff as needed. > The LNA

Re: [time-nuts] GPS down converter question

On Wed, 2 Dec 2015 21:12:42 -0500 Ian Stirling wrote: > Here's a video of Dave Jones soldering a QFN chip. > http://www.eevblog.com/2013/01/08/eevblog-408-schmart-board-0-4mm-qfn-smd-soldering/ Unfortunately, this technique only works if you don't have a ground pad to

Re: [time-nuts] soldering QFN (was: GPS down converter question)

Attila sorry flipped some letters. On Thu, Dec 3, 2015 at 10:06 AM, paul swed wrote: > Atilla, > Thanks you have read what I have written and further your experience > aligns with mine for hacking these chips at least into the GHz range. I > suspect it really falls apart in

Re: [time-nuts] eLORAN on the air starting 8 Dec

Bill not so sure about that. I agree they do pop up sort of randomly. The note I get is for the longer tests. Curious how are you monitoring?? I can see some magical 100 KHz rcvr with alarm/squelch seems to be handy. Not that they exist. I will guess the SRs700 would relock also but I don't leave

Re: [time-nuts] soldering QFN (was: GPS down converter question)

Atilla, Thanks you have read what I have written and further your experience aligns with mine for hacking these chips at least into the GHz range. I suspect it really falls apart in the 2-3 GHz and above region. But I have built a lot in the 1.296 GHz region so have that experience at least.

Re: [time-nuts] eLORAN on the air starting 8 Dec

Bill, I don't hear anything up here. But I do have some interference every 7.5 KHz. Was just shutting things off around the house no luck. Frankly it actually sounds far away anyhow. But figured I would check. I speak with Steve and Andre and have had some good conversations on vlf. Few folks know

[time-nuts] soldering QFN (was: GPS down converter question)

These are a fairly nice and cheap hot air tool. The really nice thing is they have been reverse-engineered and an open-source firmware is available. I have one. Have also built a nice reflow oven out of a $40 Walmart toaster oven... I used the temperature control PID code out of Lady

Re: [time-nuts] GPS down converter question

On Thu, Dec 03, 2015 at 01:53:25PM +0100, Attila Kinali wrote: > On Wed, 2 Dec 2015 21:12:42 -0500 > Ian Stirling wrote: >> Here's a video of Dave Jones soldering a QFN chip. >> http://www.eevblog.com/2013/01/08/eevblog-408-schmart-board-0-4mm-qfn-smd-soldering/ >

[time-nuts] soldering QFN (was: GPS down converter question)

OSHSTENCILS.COM make excellent laser cut kapton solder paste stencils for dirt cheap. I have had stencils in the mail the same day I sent them gerber files. OSHPARK does good work for boards, but they can be expensive for larger boards or quantities. I usually use gojgo.com (in China, but I

Re: [time-nuts] soldering QFN (was: GPS down converter question)

Mark My thinking is to buy one from the guy who sold 2560 of them. Others have a far lower count. So figured he was the right one. Oh another project. Hack the solder station. Maybe I will wait a while on that. On Thu, Dec 3, 2015 at 2:55 PM, Mark Sims wrote: > These are a

Re: [time-nuts] eLORAN on the air starting 8 Dec

Hi Paul I am in contact with John, the tech at Wildwood and he gives me a heads up and I also get word from Steve at UrsaNav. I have a rx tuned to 100 khz with squelch and send him pics from our SA at times. Any ideas on what might be on 122.3 khz and 122.9 khz. 73, Bill, WA2DVU Cape May