Архив за 15.07.2018

Using the Garmin RINO GPS/FRS Radio in APRS

Using the Garmin RINO GPS/FRS Radio in APRS submitted by /u/sanjurjo
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NOAA 18 and Meteor M2 positioning seems to be purposeful

I'm thinking that the russians are purposefully positioning their M2 sat on a similar orbit/timing to interfere with our NOAA 18. They could change it back to their previously used freq, I think it was 137.100 Mhz and stop this if this wasn't on purpose. JMHO

submitted by /u/rigdowntex
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Comment on A Tutorial on using SDRAngel for DMR, D-Star and Fusion Reception with an RTL-SDR by Ken Dorsey — KA8OAD

I can’t get SDRAngel to open my HackRF One. I am able to select it as a sampling device but when I click the play button I receive a message “Could not start sample source”. I do have the Zadig drivers installed and it works using SDR#. I am running Windows 10 64 bit on a 64 bit CPU. Does anyone have any ideas or suggestions, I’d really like to get this working for its TX capabilities.

Comment on Testing out the New Airspy HF+ Preselector by Timmy

Looking at the above image I’m seeing components that look like what I’m tallied up the price for below using mouser/digikey, I’m guessing most of the components so take everything with a grain of salt.

Nice thick layer of cream:
~52x 20% tolerance passive components: ~14 inductors, ~27 capacitors, ~11 resistors
inductors ~4 cents each ($0.56 for 14)
capacitors ~3 cents each ($0.81 for 27)
resistors ~ 1 cents each ($0.11 for 11)

Thick layer of cream:
~52x 1% tolerance passive components: ~14 inductors, ~27 capacitors, ~11 resistors
inductors ~15 cents each ($2.1 for 14)
capacitors ~2 cents each ($0.54 for 27)
resistors ~0.3 cents each ($0.04 for 11)

Going bust:
~52x 0.1% tolerance passive components: ~14 inductors, ~27 capacitors, ~11 resistors
inductors ~50 cents each ($7 for 14)
capacitors ~25 cents each ($6.75 for 27)
resistors ~6 cents each ($0.66 for 11)

2x pe42641 SP4T RF switch ~$1 each
2x ?TVS diodes? ~2 cents each
1x PCB $1 maybe $2 – the PCB is small and looks like a two sided PCB with vias.
1x EMI metal shielding ~$1

assembly and testing $1 to $2 each

Typically you multiply the BOM by 3 to get the approximate price, because there is usually a 30% profit margin to creators and a 30-40% profit margin to the distributors.

If they are using 0.1% components, which is total overkill, the numbers look like they would be out of business soon.
If they are using 1% passives, they are probably making an extra $20 on each sale, which they will need to help cover people who, think they can install the board but can’t and, destroy their HF+.
If they are using 20% tolerance components. That would be a BOM of ~$7.5 and an extra $27 cream on top of the usual profit margins.

I’m not seeing 10x profit margins, but maybe my maths is not as good as yours. Oh and all of the above prices assumed that you were buying components in bulk, shipments of 10k each, so if you were making a one off, you could not make it that cheap, you would pay over $50 to make your own board.

RTL-SDR Discussion • Re: RTL-SDR dongle over Ethernet

Thanks for sharing.

With my Wifi network, only the spyservers work. I haven't got enough bandwidth for RTL_TCP or Virtualhere. It was worth a try anyway.
Maybe it could work with LAN over power line ?

Regards,

James

Statistics: Posted by James_from_France — Sun Jul 15, 2018 2:06 pm


Troubleshooting Help • SDR# + Windows 10 Pro + gr-dect2?

Is it possible to install gr-dect2 into SDR# on a laptop running Windows 10 Pro? Here is a link to gr-dect2:
https://github.com/pavelyazev/gr-dect2
I'm knowing its possible to have an Ubuntu command prompt up and running on Windows 10 Pro. I'm not knowing how to put it all together. :?:

Statistics: Posted by OKCarl — Sun Jul 15, 2018 1:36 pm


Comment on Testing out the New Airspy HF+ Preselector by Truth

With a 1000% recharge over the bill of materials + assembly we can easily undestand why this cm. 3×1.5 filter bank, essential in any respectable SDR receiver, was not inserted in the main pcb.

New RTL-SDR Dipole Antenna Performance Question

Does anyone have one of the newer dipoles that rtl-sdr.com is selling instead of the old stock antennaes? How are they compared to the older ones? Improvement?

Anyone else have any recommended antennas that fit the rtl-sdr?

submitted by /u/musashisamurai
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Question about double cross antenna

I finally have all the parts together for a double cross antenna. I'm following these two guides:

http://www.qsl.net/py4zbz/DCA.pdf

https://imgur.com/a/TiZ41

I understand nearly everything except this: at page 3/3 of the DCA.pdf it shows 4 coax going to a dipole each, but the core going to one and the braid/shield going to another. But on page 2 the dipole length should be 38.25 inches. Should I cut this in half and put the copper core to one and the braid to the other half?

Here's a quick paint job I did with my question that is much easier to understand.

https://i.imgur.com/QehU8F4.png

Should it be A or B?

submitted by /u/Patq911
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Military ACC

Thumbing around and I came across a strong digital signal at 11.016 USB. Found some sites that say this is "ACC". Other than the basketball conference, what would ACC mean?

http://johngaltfla.com/wordpress/voice-of-galt-shortwave-radio-central/military-shortwave-frequencies/

submitted by /u/lroux315
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