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BradtheRad,
Thanks for your suggestion.
Maybe many tunnel diodes are lying in a attic as they were once very popular. A club or maybe HAM is a good idea.
There are several tunnel diodes on eBay, expensive or rare parts，all not local.
1637829819
Thanks. We do not ultilize its negative...
I need general tunnel diodes when designing a random oscillator.（Tunnel diode is one of some old components that are attracting new attentions). After some searching, I found most tunnel diodes are too old and were discontinued, such as 1N3716, 2BS4, 1N2927 and etc. I also failed to search some...
Alternately, you can build a LC vco from 500Mhz to 600MHz and mixed with 500Mhz down to 0~100MHz. You can use ADF4360-7 if you do not want to tune. However you have to set the ADF4360's frequency resolution to 1KHz to get the min 1KHz frequency and need isolation between 2 vcos. You can also...
Some VCOs' varactor is added between Vcc and Vtune pin rather than between Vtune pin and Ground pin.You can check the VCO VDD between cases.The noise between Vp and Vdd_VCO should be filtered out.
It is strange for the VCO to get a single freqency with 4.3/4.7V vtune. One case should be unlocked. You can try to tune the Charge pump current register to observe and optimize the phase noise. ADF4157 has best performance when VTUner is btween 0.5V and Vp-0.5V. The Vp should be clean.
I think the size is not a big problem but it may be a big challenge to keep both transmitter and receiver in low power consuming. There are 2 schemes from google:
1. Based on wirelss remote control(such as used in a RC car toy): The transmitter sends out a coded FSK/ASK signal when buttons...
It looks quite interesting. I guess you have tried to bypass the DC/DC or even the big capacitors and power the board externally but the sound remains unchanged.Is the board soldered or connected to some mother board? The small board should be resonating. I noticed that the board is quite hot...
Hi, All,
From Shannon's equation. C=Wlog2(1+S/N), S/N requirement can be decreased infinitely by decreasing the bit rate while keep the band width, or in another way, by keeping S and decreasing bandwidth, bit rate and noise. In some zigbee application, we do need a slow (such 10 bps), low...
I guess port extension is not accurate enough and the tip length is not included.In your case, port extension when "short" may be more accurate. But the calibration error should not bring much trouble in your antenna test except the phase should be included.
Generally the following steps can be considered:
1. Increase mess to check convergence.
2. Increase the space between antenna and boundary to check boundary sets are ok.
3. tune antenna size to get a return loss better than -6dB
4. Change the dielectric and metal to loss less to check...
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