PA4DAN

@olegkutkov I think it’s this Wurth TVS: we-online.com/components/pro…

@marunmagesh @travisgoodspeed If 'below $10' is cheap enough, try searching 'Holyiot nrf5340' on Ali. They have a module based on the 5340.

@travisgoodspeed it's annoying hard to find a nrf5340 module which is cheap enough to buy like 4 - 5 units to experiment with glitching.

Just wondering, who has a working voltage glitch for extracting firmware from the nRF5340?

@Marco_Langbroek Reuze bedankt voor de tip. Schitterend tegen strak heldere lucht gezien vanuit een zolderraam net onder Eindhoven.

Nu de lancering van Landsat 9 op tijd heeft plaatsgevonden, een herinnering dat (als het opklaart) later vanavond aan de noordelijke horizon mogelijk de deorbit burn van de Centaur bovenste rakettrap zichtbaar is:

@Marco_Langbroek Net onder Eindhoven ook goed zichtbaar.

Ik kan het mis hebben, maar ik heb de indruk dat er achter de lagere bewolking, vrij hoog aan de hemel op dit moment Lichtende Nachtwolken zichtbaar worden #NLC

Guess the Gain Contest - Baguette Antenna. Win everlasting notoriety 😎 by estimating the gain, frequency, ect of this tasty antenna. Re-tweet, and get closest to the measured results ... your picture will be on our website forever! Enter HERE antennatestlab.com/silly-antennas

LongMynd - un récepteur logiciel DVB-S/S2 sous linux pilotant le MiniTiouner de Jean-Pierre F6DZP. Merci à Heather M0HMO pour ce développement ! Tous les détails dans CQ-TV 265 et sur github.com/myorangedragon…. Photos des 1er tests sous ubuntu.

@ZhaoFen37759626 Calculating the impedances for 2.5GHz from the table with that gives +3.169+j5.190 Ohm for the input impedance and 14.225-j4.469 Ohm for the output. So my guess for the real part of S11 was a bit too high, the other values almost spot on.

@ZhaoFen37759626 complex_impedance = (1 + reflection_coefficient_S) / (1 - reflection_coefficient_S) * normalized_impedance Where: normalized_impedance = 50 angle_in_radians = angle_in_degrees / 180 * pi

For FLL357, what is the input and output impedance of the transistor? Can you see this Smith circle diagram? Who can tell me...

@remcodenbesten @eb4fbz @uhf_satcom Sorry for not being more clear. What I meant was that the document you post (for the TFF1015) does go into detail, where the app note for the TFF1044 that I read earlier didn't. The app note for the TFF1015 indeed clearly states that balanced signals should work better.

@PA4DAN @eb4fbz @uhf_satcom Enough to support my initial posting ; -)

The Red Extend submitted for a novel ext REF injection method, suggested by a friend of mine. Symmetrical injection reduces PLL noise, he said. Just tested the modified LNB and it works excellent. AL of FB = 470 nH and 4 wdg (XL = ca. 1.2 kΩ. Xfrmr is 1:1 (not bifilar). #qo100

@remcodenbesten @eb4fbz @uhf_satcom Thanks for the pointer. The TFF1044's application note doesn't go into that much detail about its reference inputs.

@PA4DAN @eb4fbz @uhf_satcom NXP has an application note concerning balanced injection and phase noise. This is the link: nxp.com/docs/en/applic… Indeed, the Inverto Red Extend LNB contains a TFF1015.

@eb4fbz @remcodenbesten @uhf_satcom On my PCB I have AC grounded one pin and only connected a reference signal to the other. The thought of feeding it a balanced signal to reduce phase noise hadn't crossed my mind yet. When I get back to working on the LNB I'll do some measurements on this to see if it helps.

@eb4fbz @remcodenbesten @uhf_satcom AC grouding one pin and measuring the minimum required external reference signal on the other showed that it accepts exactly the same level on either of the two pins. At least the TFF1044HN seems to have a fully balanced crystal oscillator inside.

@F5OEOEvariste @LimeMicro @natsfr (In case it could be of any help: I still have the code to e.g. calculate the LUTs etc. around somewhere, but seeing that you're already successfully transmitting with your code I think you're not going to need help there. 🙃 )

@F5OEOEvariste @LimeMicro @natsfr Great work! This was on my TODO-list as well. Years ago I created a PCB with 2x XC9572, 2x 10ns SRAMs and a TX DAC. With a bit of creativity, a 128KB lookup table allowed me to create near-perfect DVB-S signals with DAC rates upto 100Msmps and 16x oversampling.

DATV with @LimeMicro custom FPGA firmware is just released. Improving rate(up to 39MS) and MER (upsampling) supporting DVBS and S2 (QPSK only). @natsfr firmware github.com/natsfr/LimeSDR…. Easy integrated in github.com/F5OEO/dvbsdr.