Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

t: Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set -- From: "Bruce Griffiths" <bruce.griffi...@xtra.co.nz> > You actually need to measure the filter > response. OK. It is here (the frequency span is 2..1

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

-- From: "Bruce Griffiths" You actually need to measure the filter response. OK. It is here (the frequency span is 2..102MHz, the amplitude axis is 10dB/div): http://skydan.in.ua/PNTestSet/PN_LPF1.jpg Sorry, the

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

amplifiers on the mixer / phase detector input ports is one way of ensuring that injection locking doesn't occur. Bruce From: Gerhard Hoffmann <dk...@arcor.de> To: time-nuts@febo.com Sent: Thursday, 31 March 2016 12:12 PM Subject: Re: [time-nuts] Oleg' s PN test Re: A new member &

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Am 30.03.2016 um 21:20 schrieb Bruce Griffiths: Conical inductors are available that are effectively resonance free to 40GHz but the largest value is around 10uH. In principle one could wind one's own conical inductor with a larger value, However an iron powder (carbonyl iron - available from

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

On Thursday, March 31, 2016 08:20:19 AM Bruce Griffiths wrote: > The first inductor self resonance is much lower than it need be. EPCOS have > a range of inductors which have a much higher first self resonance > frequency. > > The other problem is that inductors have several resonances

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

t; <bruce.griffi...@xtra.co.nz> > Sent: Wednesday, March 30, 2016 7:29 AM > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Subject: Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set > > > One hidden

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

-- From: "Bruce Griffiths" <bruce.griffi...@xtra.co.nz> Sent: Wednesday, March 30, 2016 7:29 AM To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Subject: Re: [time-nuts] Oleg' s PN

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

One hidden issue you don't address is that operation of the 40uH inductor at frequencies above its parallel resonance may allow substantial RF at the sum of the LO and RF frequencies to appear at the opamp input. 120MHz at the 797 input will likely lead to RF rectification effects in the opamp

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi Oleg Le 29/03/2016 07:18, Oleg Skydan a écrit : I also tried DL4YHF Spectrum Lab - it works, but lacks of logarithmic frequency scale (or I just did not find how to enable it). Just right-click on the frequency scale, then click on "more ...", and then tick on "logarithmic" in the

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

NIST indicate in several early papers that using 50 ohm in series with a capacitor increases the noise over that achieved by capacitively terminating the IF port at the sum frequency (LO + RF) as you have done. NB the RF and LO port match will be improved somewhat with suitable low value series

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi Magnus, Would not GNUradio be a good platform to encode the calibration stuff a little more gift-wrapped? I never used the GNUradio. Basically you can use any SA software/hardware which has the necessary capabilities. What spectrum-analyzer software do you use? (Just curious) It is an

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi, Bruce, Thank you for the comments and useful link. Probably you did not understand the goal and positioning of this "project" and I did not tell the history of how it was build :) So, the solely goal of making this "test set" was to assist with the design of the synthesizer unit for my

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Inversion of gain isn't required, the system will just lock on the opposite slope of the phase detector output. Level shifting to accommodate different EFC ranges nay be useful however. Bruce On Tuesday, 29 March 2016 1:12 PM, Magnus Danielson wrote: Hi

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi Oleg, I like the simplicity here. Would not GNUradio be a good platform to encode the calibration stuff a little more gift-wrapped? What spectrum-analyzer software do you use? (Just curious) This simple setup would be useful for many purposes. Depending on the oscillator, the EFC can

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

That's probably a good example of how not to do it well. 1) The chosen mixer isnt as low noise as the various Minicircuits phase detectors. 2) The 50 ohm load after the filter merely serves to halve the phase detector gain. The IF port is terminated by a 15nF capacitor at RF and LO frequencies

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi, everybody! OK. Let's start. Here is the schematics of the "test set" http://skydan.in.ua/PNTestSet/PN%20Test%20set.pdf . It consists of three small boards: 1. Mixer board - a simple mixer (500MHz ADE-1+) with 200kHz pi-LPF at the mixer output. 2. LNA board - a non-inverting low noise AF