Hi Andy Problem there is it lasts , what seems to be the full duration of the data phase [ phase as a change from cw to data .. etc ] wspr via a ssb rig , overdriving usua
I don't think its stability Andy , could be step response and settling time , the new U3 kit uses a PLL and produces , what was thought to be key click's but is PLL settling
OK, I'm all confused now. The [HEF] 4013 is a dual Flip-Flop; how have you made it oscill with a crystal ? (Or have you hidden something under the board) Andy G4JNT On 14 July 2015 at 22:16, DK7FC
Yes, there's a JFET on the other side. So far a BF245A. It works well. But the circuit consumes 3.5 mA. I thought it could be less. It is running at 5V DC and the xtal frequency is 1.8432 MHz. I loo
I found this email in my spam box (I use GMail). The reason given, was that it had failed some test relating to AOL sources ( ?? ) I unspammed it, then forwarded to the "anti-spam team" as suggeste
That is interesting, and encouraging. I inserted your loop parameters into a spreadsheet I wrote many years ago in the early days of LF to calculate the properties of loop antennas. As the spreads
Yes there is. Or , are: several. Don't drive the MOSFET directly from the IC. Instead use a capacitor and DC restorer circuit. That guards against both the driver staying high permanently if driv
Forgot to mention, although I hope it is more than self-evident to readers here, the diode is orientated so it points 'upwards'; allowing a positive drive voltage to appear on the gate and clamping
Maybe also worth to mention: Capacitive coupling of the driver to the gate will reduce the peak voltage at the gate by half (assuming 50% duty cycle). The IC driver voltage should be at least 12V i
There is Miller feedback present, where the drain change of voltage is fed back to the gate via internal capacitiance. The effect is to magnify the Cdg value by the voltage gain, so its bound to giv
On the RSGBTech group recently G3RZP described his folded monopole topband antenna. he runs an insulated wire up the side of the lattice mast to which it is bonded at the top. The bottom of this wi
I believe it's neither 3dB nor 6dB increase for ERP. What is squared by doubling the effective height is is Rrad. The increase in ERP is by far not so high and depends much on Rloss (ground and matc
6dB per bit 'jnt On 16 August 2015 at 20:19, Graham <[email protected]> wrote: That's one of those urban things :) Sure the abs range is 3 dB per bit + 3 But the reference point is floa
A while ago I made a medium power (~ 50 watts) linear PA for use at LF to MF. Details are here http://www.g4jnt.com/linear_LF_PA3.pdf After a discussion about linearity on IMD in switching FET PAs on
Hi Stefan, a wspr -6dB sgnal is audible ? The question is this: with this condition and if necessary a bit more power it is possible a cw qso? 73, Fausto IK4NMF -- Original Message -- From:
EbAnut is a new one here - I hadn't heard of it. After Googling I found the page and read up / downloaded the software. Unfortunately, I see it is not standalone, and requires Spectrum lab to act
That gives me an idea ... For some time I've been toying with the idea of writing a utility that reads audio in blocks based on UTC timings and saves to a .WAV file . It woudl form part of a long te
Yessss... Hadn't appreciated that was what it was doing until I read the description in more detail. I suppose that if soundcards are going to be used as the interface some sort of locking will hav
No, this doesn't work as the sampling of the I and Q information must be simultaneous. Doing it your way, they are offset by a cycle of Fc In fact, I had this very discussion with G3PLX back in 199
