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Well, the GPS derived 1PPS is the cheapest way to get a pretty well long term stable timing signal. But, my concern is that the 1PPS output jitter will be badly effected by weather and other factors, which could not be well controlled.
See this:
PPS Quality Estimation From Different...
Hello guys,
The question comes from evaluate two rubidium clock sources, one is bought as used clock with nice price, another is disassembled from an old basestation. I don't know the detailed spec of two clocks. After reading some material on time source measurement, I found the methods on the...
Hi guys,
The question comes from installing a rod antenna to homebrew wideband receiver(20Mhz-1Ghz).
I built this receiver with spectrum analysis ability. so, I could see anything in the band.
In initial phase of work, I use an used signal source from R&S to test the receiver. The spectrum...
Hi chuckey,
Your idea and suggestion give me the direction to figure out why we need bias to positive voltage. I didn't notice that the duty cycle matters in this way. And, your suggestion on diode also helps much.
Thanks a lot! Also, my thanks to FvM and Brian!
Nice day,
Jeff
Hi guys,
I'm trying to buffer and transfer high quality 10Mhz clock to external device. With the requirement of external device, I need to amplify this clock signal by Gain of 2. After reading a article from analog device, see link below...
Hi guys,
I'm using Mini-Circuit's Gain block amplifier, Gali-4F as receiver's IF amplifier. I used a very simple bias circuit, with a combination with resistor and RF choke. The bias resistor is selected by calculation and experiment. See attachment.
However, the question comes from the bias...
Folks,
Here's a bandpass filter with upper/lower corner frequency around 30Mhz/3Mhz. Because the bandwidth is much wider than center
frequency, it actually constructs by cascading a 30Mhz lowpass with 3Mhz highpass. The simulated response meets my expectation.
However, when trying to...
Hello,
I attempted to place a bead in clock line with small cap 100pF in Shunt. The clock spur is reduced greatly. However, the noise floor is still higher than expected.
In further experiment, I found the path, where the clock spur is picked into receiver, is an short line buried in the middle...
Hello folks,
I'm trying to build a homebrew RF receiver board. The receiver is of 2 stage down-converter schema. The first IF SAW filter of that receiver is selected to 190Mhz center frequency. In actual measurement the 2IF output, I found a Spur in middle of receiver passband. With some...
Why u state 'take a 3 to 4 dB increase by using a PLL at the higher frequency'? For PLL direct synthesis, the close-in phase noise is dominated by PLL's FOM, which you double the frequency, the increment of close-in phase noise should also increase 6dB.
Hi Biff44 and above,
Thanks for your information and comment on this.
The context forcing me to use the mixer as upconverter is higher IF frequency than RF input. So, I have to route the RF input signal into mixer's IF port, then up-convert to higher IF frequency. My current plan is to drive...
Hello,
I notice there once was a similar post on this topic. Based on the suggestion in that post, it seems to be Okay to use mixer 'IF' as input, 'Rf' as Output.
However, I reviewed the simplified schematic of the selected mixer. Still a bit of concern on this usage. You could see in...
Hello,
I am newbie to Rf mixer. When I select a mixer from minicircuit, the datasheet informs the IM3 performance as 'ip3 at center band'. It's really confused for me. Because, I don't know the ip3 under this context means for iip3 or oip3. Does anyone know the definition?
Below is the link...
Hi guys,
I'm trying to build a homebrew VHF receiver. When I build the first prototype, I divide the system into three board, power supply, baseband receiver, and RF receiver. The power supply is legacy board, which is designed for another circuit. The analog power supply and digital power...
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