For the following two plots the VCOs were tuned to there minimum frequency.
The digital potentiometer were set to maximum sawtooth amplitude, with NE555 set to high freqeuncy sawtooth mode.
You can see the generated bandwidth of the VCO signal covers a few 100MHz on full sawtooth amplitude.
In my opinion this should be changed to cover maybe just 100MHz bandwidth at full amplidute.
Cause otherwise the bandwidth resolution which could be set by the digital potentiometer is quite low. A few KHz bandwidth per digit would be fine.
Wave Bubble 2010
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Please be positive and constructive with your questions and comments.
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Re: Wave Bubble 2010
Here are two plots of the output power over the full VCO frequency range.
Input level to PLL (with T-Attenuator between VCO and PLL):
Low band: -7dBm to -12dBm
High band: -8dBm to -20dBm
Next step will be testing the gain stage.
Input level to PLL (with T-Attenuator between VCO and PLL):
Low band: -7dBm to -12dBm
High band: -8dBm to -20dBm
Next step will be testing the gain stage.
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Re: Wave Bubble 2010
i'm getting very excited looks promising so far...
aqisnotliquid --->the black pcbs are a go for me by the way< if everything works out lets get a thread together for a bulk order
aqisnotliquid --->the black pcbs are a go for me by the way< if everything works out lets get a thread together for a bulk order
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Re: Wave Bubble 2010
So folks, here are the results from measurements with amplifier installed.
The amplifier is a BANNED-84. Bias resistor is 1 Ohm and Vcc 5.8V. Both amplifier stages drawing a bit more than 100mA.
The amplifier is a BANNED-84. Bias resistor is 1 Ohm and Vcc 5.8V. Both amplifier stages drawing a bit more than 100mA.
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Re: Wave Bubble 2010
High band 7-14dBm averange and 14-20dBm max power.
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Re: Wave Bubble 2010
Forgot one plot, 100MHz sweep from 2400-2500MHz, max power:
- aqisnotliquid
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Re: Wave Bubble 2010
The plots look great. I'm waiting for the final go ahead to put out a batch order.
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Re: Wave Bubble 2010
Please count me in when you order batch of boards. Can make deposit
- javajax
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Re: Wave Bubble 2010
Let me know when you are doing the batch order I'll go in on it.
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Re: Wave Bubble 2010
Add me to the list as well
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Re: Wave Bubble 2010
I would be interested as well. So excited for this.
- jarsnah12
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- Joined: Sun Nov 28, 2010 2:15 am
Re: Wave Bubble 2010
I too would be interested. Let me know what the final cost would be to add me to the order.
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- Joined: Mon Feb 08, 2010 1:28 pm
Re: Wave Bubble 2010
Just a thought an ATMega16u4 is a couple of quid cheaper than an FT232 and can do the sample function as a USB-serial converter, but then gives you a load of extra IO pins!!!!!!
See the Teensy for more inspiration.
See the Teensy for more inspiration.
Please be positive and constructive with your questions and comments.