Yep, that S2 was a typo. I'm in the process of building a custom direct conversion Rx for narrowband. So far I've built a follow on digitiser for Softrock or QSD type receivers. Two identical opa
Why would you want to do that ? Andy On 1 October 2015 at 22:01, DK7FC <[email protected]> wrote: Hi all, Does someone of you know a time server program which allows to set a certain time offset
You might consider the packet format used by vlfrx-tools, which (correct me if I'm wrong Wolf) can also be read by Spectrum Lab. It has the fields you need and a magic number to sync on. Rummaging t
That's a lovely nice simple bit of software to use. Can I publicise it on a couple of other groups for users who need accurate timekeeping? I'm glad to see you make the source code freely available t
Continuing on this theme... Having abandonned my idea of a direct conversion Rx due to uncontrollable DC offsets, and not yet finished a locked clock for my SDR-IQ, I wondered about the next stage. T
Laurence, Chris & All: I did a test with my eprobe which is about 30 feet away from my HF elevated ground plane that has 65 ft radials a few years back. With 100W output on 40 meters. I was getting
You could use a latching relay, and pulse the supply with reverse polarity to set teh input short. (Suitably protecting the preamp electronics with a diode) 'jnt On 15 October 2015 at 18:14, John An
I have always intensely disliked tapped 'loading' coils such as that, for precisely the reason you mention - a tap at one turn. This is the sort of thing you'd expect with a high Q system. Tapped
The overload protection circuit used on the Decca transmitter is a rather clever technique involving an over-winding on the output tank, whose output is rectified and fed back into the power supply.
My 137kHz dual mode WSPR beacon is running. It randomly alternates between WSPR-2 and WSPR-15 mode (shifting frequency appropriately) Two callsigns are in use, G4JNT on -2 and G8IMR on -15, this
Need to ask the obvious - is the frequency recorded in Joe's spots the actual one you were transmitting on? Exactly, spot on, to the Hz ? When you say I and Q are "somewhat different", do you mean,
Can I warn against one feature shown in the circuit diagram The two 10uF electrolytics connected from the output of the first opamp to the supply rails should not be there. They cause instability
Actually, looking again at the circuit again, it is not necessary to use an opamp in that position to define the mid rail for the comparator reference. Just two equal; value resistors and one elec
Yes, Indeed Andy On 31 October 2015 at 17:00, Chris Wilson <[email protected]> wrote: Hello Andy, Saturday, October 31, 2015 Is this what you mean? http://www.chriswilson.tv/phase-driver.jpg Thank
It's primarily not a matter of efficieny but of flux density in the core What is the size of the core and your power level? Generally I would wind as much turns as feasible on the core to keep flux
I'm testing out a coherent receiver for LF and looking for something of air that WILL show an ionospheric effect from time to time. So looking for a station transmitting with an Rb or Cs controlled
Inline images 1 Hope this graphic passes though the two groups / reflectors... It shows a vectorscope plot of the 252kHz RTE broadcast carrier this afternoon. The mean phase of the carrier is sol
After posting that image I tuned in the signal on an AM receiver and realised what was causing the circle. There was audio another weaker transmission underneath it - in French I think. So the cir
