Yep, same here. It feels correct: I = COS, Q = SIN 'jnt On 10 December 2015 at 20:34, Paul Nicholson <[email protected]> wrote: In vlfrx-tools I use I = s(t) * cos( 2pi * Fo * t); Q = s(t) * sin
The PC decimation / FFT / file storage software needs a fine tune LO. That will allow the DC spikes to be removed from any plot s/ files , as well as allowing finer tuning resolution than the 0.01Hz
I'm am looking at 60kHz at the moment, MSF appears to be off air, but I am receiving a weak signal from what is clearly a time code signal as it pulses at one second, but its phase is a bit unstable.
Hi Andy, presumably the digital 1 kHz-to-baseband conversion is done in an FPGA or DSP in realtime. The associated periodic processing activity or register content could lead to a 1 kHz component r
I've just added a fine tune to the PC prog to shift teh input frequeny by any amount specified in a text box LOtheta = Val(Tuning.Text) / Fsample LocalOsc = LocalOsc + LOtheta
Hit send too soon on the last one On 12 December 2015 at 12:06, Andy Talbot <[email protected]> wrote: I've just added a fine tune to the PC prog to shift teh input frequeny by any amount specifie
The terms "leading" and "lagging" are the most confusing terms I've ever come across in AC. A waveform on a scope, to the right of another one looks as if its leading it. But it is later in time -
And, once again I managed to find a keyboard shortcut by mistake that sent the message too soon............ I always think only in terms of sin and cos. Real = = Inphase = COS Imag = Quadrature = SI
Looked at like that it makes good sense. On a vector scope plot, with I along the positive X axis and Y vertically upwards, a positive frequency rotates anti-clockwise, from I to Q, ie from right h
If there is anyone here who is also subscribed to a VLF forum, they may like to pass on my observation that the "Alpha" transmitter at Revda, which has been off-air for many years, has reappeared
There's also another issue with having a variometer in the shack, driving a length of transmission line then the loading coil / antenna. I discovered this by chance, and almost wrecked a 73kHz tran
SSB and especially CW - just tooooo boring for those not yet retired Killing amateur radio Where are the youngsters Embrace the 20th century now we're in the 21st Andy / G4JNT On 24 December 2015 at
Now Now , If there was no SSB tx/rx, how could you hope to send all those strange linear phase continuous multi frequency data systems ? G,) From: [email protected] Andy Talbot Sen
September RadCom, not August 'jnt # is the very same chap that designed the Airspy SDR. (Which I find to be a very nice unit, see the write up in August 2015 RadCom )
Dear All. I have recently purchased a Watson W-SDRX1 100kHz 2Ghz SDR RX. Has any one on the group had any experience of this SDR module especially downloading and installing the operating software?
Indeed, http://www.g4jnt.com/Melted_ATU_Cabin.JPG 'jnt On 30 December 2015 at 11:30, James Cowburn <[email protected]> wrote: Some even catch fire!!! --Original Message-- From: owner-rsgb_lf_g
I may have missed it at the time, but were any coherent tests / EbNaut type experiments done on 475kHz? And if so, what was the slowest baud rate that mostly-succeeded ? Andy G4JNT
This is a well known phenomena - surely you've seen it discussed on the LF groups over the years. All efficient communications schemes first of all remove all redundancy from a message, before adding
Hi Andy. Just like Marconi (?) the first TA contacts between 9/2000 and Jan 2001 on 137 were plain CW. 73 David --Original Message-- From: Andy Talbot [email protected] [rsgb_lf_group]
