Have you found a way to use the R820T device yet?Mike
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A smart person might use a pigtail to reduce stress on the connector
body for the dongle. 1 foot or so of that little "stuff" won't hurt as
much as a cracked circuit board. Then you can use LMR400 to the antenna
if you want to get silly.
{o.o}
On 2012/08/31 04:56, R Wall wrote:
Hi,
If it's a MCX connector, then there are a lot of adaptors for sale on ebay.
http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=MCX+adaptor&_sacat=0
Roderick.
-----Original Message----- From: jdow
Sent: Friday, August 31, 2012 1:40 PM
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Hi,
Always I read about connectors, I ask-me, whats is problem to cut
provided, useless, antenna cable, and put a more standard connector?
Making a type of pig tail.
I done it, I cut one of antenna cable and soldered a BNC-F connector.
To use direct conversion to listen HF, need to solder an tiny wires on
PCB, it is not easy task even for experienced persons.
And, the CT1FFU kit is very expensive.
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Paulino
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You might want to check your device is working correctly. Mine works extremely well for the frequencies it was sold for (88-108MHz wide-band FM), so much so that with the gain turned up I can even see FM signals all over the various bands ;-)A search turned up a few open design schematics for HF upconverter. Some not
as well received as others ;-) So maybe it's worth designing one from the
bottom upwards. It would be nice to have it SMD for low-cost and simple
assembly. First things first though, the dongle scarcely works with the
existing antenna at the radio frequencies it was sold for !
There have been a few people who received 'deaf' devices, so make sure you haven't gotten one of those.
Cheers,
Adam.
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Schematics for the 3.1 versions of the CT1FFU kit: http://www.ct1ffu.com/site/hf-convertor-manual3.1.pdf
Schematics of the ver. 4 are also available at the same page but you have to read the values of components from the 3.1 version.
As for the 4$ kit, hardly. Try to calculate the BOM cost for lets say 500 kits.
If you are doing it in the house and ordering components from 2-3 vendors just the shipping is going to be substantial.
Anyway everyone forgets the amount of work required just to pack and ship items.
I guess the new mantra is something for nothing these days.
http://www.youtube.com/watch?v=jy6ennSQGbs
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I placed an order for an e4000 based dongle but the seller said that it was no longer available (no more e4000 chips!). He suggested a dongle with an R820T tuner. Has anybody ever heard of this tuner? A different seller on ebay lists the R820T as 'Latest Chip Better Quality' :)
JP
They also said they have been getting lots of questions about SDR :-)
It does seem faulty. However, it did pick up an FM radio station. Just the one, though. And that was only outside. Hmm :(
The datasheet appears to be password protected.
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Nevermind. Missed the passwd in the email -- even after reading it 3 times
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It *will* be far easier to get the proper datasheet out of the manufacturer.
As my understanding that is just the Linux Driver of (R820T and others tuner + RTL2832U)
But it doesn’t seem to fit for you, right ?
So that, could you tell me clearly what the document you need.
List of I2C commands and configuration registers.
FYI - there was over 70 registers on Elonics E4000 tuner, see pages 17-23 and especially "Example of Frequency synthesizer configuration" on page 27 there: http://erewhon.superkuh.com/gnuradio/Elonics-E4000-Low-Power-CMOS-Multi-Band-Tunner-Datasheet.pdf
That's what we need.
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Also as a side note, it would be better if you listed which bits in each byte affect the values. You have (for example) "Current AND 0x60 OR 0x0B" means something. But you don't say whether you do the AND first or the OR first, and doing this in the wrong order gives you the wrong value. AND also turns bits on or off, but OR always turns them on, so you need to know which bits are being changed and why. In order to be able to work off the spreadsheet, it would need to say - like a datasheet does - that register 0x0B bit 4 controls the AGC, 0=on, 1=off, for example. But again this goes back to being unable to figure out what each number means, because it's not documented in the code.
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I placed an order for an e4000 based dongle but the seller said that it was no longer available (no more e4000 chips!). He suggested a dongle with an R820T tuner. Has anybody ever heard of this tuner? A different seller on ebay lists the R820T as 'Latest Chip Better Quality' :)
JP
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I have got the R820T chip dongle working fine now with SDR#. All that was needed was a free install of the Automatic install package (the batch file and auto download script). Selected the dongle in Zadig and RTL-SDR / USB option.I tried it on a NetBook first with Win7 Starter edition, and it's OK but for running at 100% CPU (Atom N450). Also running fine with Win7 64bit on a desktop with Dual Core 2Ghz CPU. Interestingly I get better results in received RF and demodulation on the Netbook, as with the Desktop the noise floor is much higher and there are a lot of birdie signals visible across the spectrum. This is regardless of antenna position. looks like interference from the PC itself right now.Martin
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