Absolutely perfect copy of the GPS locked BPSK signal from Jim at the low power setting. Although, at this power the signal can still just about be detected by ear, so I'll be more convinced when the
A bit later than intended, I'm now in a position to receive GPS locked phase coded transmissions without the need for any lock up or clock recovery. So I am looking for anyone who can transmit BPSK o
I was on the verge of cancelling this EMail account because of the amount of spam. But on BBC Breakfast this morning they mentioned the MailWasher software. Look at WWW.MAILWASHER.NET This lets you g
At the moment that is basically all that I'm using. An analogue vectorscope made by multiplying two quadrature 1kHz waveforms by the output fom the Rx after passing though a 1kHz bandpass filter. The
You can't possibly mean -5dBm. Even if propagation were line of sight, at 200km distance (near enough between you ?) Free space loss = 32.4+20LOG(f.d) [MHz, km] = 61dB. EIRP max 30dBm so max power re
Yes. it is undergoing its maintenance period and will be on and off for a few more days. Look at the NPL website www.npl.co.uk and follow the links to time and frequency measurement. During the perio
OK, Thanks to all for replies on the noise generator calculations. I'm now quite convinced its a simple SQRT(2*BW / Fclock) power division from the total calculated from peak waveform voltage. The la
Yes please, do that. My feeling is that there 'has' to be a pi in there somewhere, Errors in H&H aren't unknown... I dislike SIN(X)/X calculations, they always involve PIs in strange places and never
Right, think I have an answer now, thanks to Stewart and Stewart... If the total integral = pi watts (Ok, volts squared over an arbitrary impedance, but call them watts for now :-) this is what my 2.
Yes, the power spectrum of a SIN(X) / X pattern. To Brian 'GVB, the limits will be (theoretically at least) - infinity to infinity, but in practice a few lobes will be sufficient, say about +/- 5 And
Is there anyone who can answer this... I want to make a calibrator to enable accurate (better than 0.5%) absolute audio measurements using a soundcard - ie. at audio frequencies to 20kHz. Generating
Farnell will have them. www.farnellinone.co.uk Andy G4JNT Hello all, I am wondering where I can get (one of) the following components: TC4421 TC4422 TC4426 MUR1660CT A google search didn't deliver a
Basically, correct - if you transmit 10B/s PSK on 137kHz without any bandwidth filtering people get a bit upset. We did look at turning it into some phase continuous mode - CPM - but there seemed to
I thought Al values was a meaningless term for pure ferrite materials and is only published as a guideline as it changes dramatically with temperature and B - for a true/ideal transformer it would id
