Wave Bubble 2010

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Mictronics
 
Posts: 63
Joined: Sat Feb 20, 2010 3:16 pm

Re: Wave Bubble 2010

Post by Mictronics »

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.
Low band VCO, minimum frequency tuned, maximum sawtooth sweep
Low band VCO, minimum frequency tuned, maximum sawtooth sweep
ESPI-ESPI@2010-09-26_23-50-56.png (7.14 KiB) Viewed 3997 times
High band VCO, minimum frequency tuned, maximum sawtooth sweep
High band VCO, minimum frequency tuned, maximum sawtooth sweep
ESPI-ESPI@2010-09-26_23-35-01.png (6.46 KiB) Viewed 3997 times
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.

Mictronics
 
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Joined: Sat Feb 20, 2010 3:16 pm

Re: Wave Bubble 2010

Post by Mictronics »

Here are two plots of the output power over the full VCO frequency range.
Low band VCO, full span output power sweep
Low band VCO, full span output power sweep
ESPI-ESPI@2010-09-27_01-03-04.png (6.33 KiB) Viewed 3996 times
High band VCO, full span output power sweep
High band VCO, full span output power sweep
ESPI-ESPI@2010-09-27_01-25-13.png (6.28 KiB) Viewed 3996 times
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.

skygear
 
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Joined: Tue Sep 21, 2010 3:28 am

Re: Wave Bubble 2010

Post by skygear »

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

Mictronics
 
Posts: 63
Joined: Sat Feb 20, 2010 3:16 pm

Re: Wave Bubble 2010

Post by Mictronics »

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.
High Band, Max Power 1575MHz
High Band, Max Power 1575MHz
ESPI-ESPI@2010-10-18_03-27-54.png (8.6 KiB) Viewed 3873 times
High Band , Average Power 2450MHz
High Band , Average Power 2450MHz
ESPI-ESPI@2010-10-18_03-24-57.png (7.95 KiB) Viewed 3873 times
High Band, Max Power 2450MHz
High Band, Max Power 2450MHz
ESPI-ESPI@2010-10-18_03-29-07.png (8.61 KiB) Viewed 3873 times

Mictronics
 
Posts: 63
Joined: Sat Feb 20, 2010 3:16 pm

Re: Wave Bubble 2010

Post by Mictronics »

High Band, Average Power 1575MHz
High Band, Average Power 1575MHz
ESPI-ESPI@2010-10-18_03-27-23.png (8.25 KiB) Viewed 3873 times
Low Band, Average 350MHz
Low Band, Average 350MHz
ESPI-ESPI@2010-10-18_03-37-20.png (8.02 KiB) Viewed 3873 times
Low Band, Max Power 350MHz
Low Band, Max Power 350MHz
ESPI-ESPI@2010-10-18_03-37-36.png (8.69 KiB) Viewed 3873 times

Mictronics
 
Posts: 63
Joined: Sat Feb 20, 2010 3:16 pm

Re: Wave Bubble 2010

Post by Mictronics »

Low Band, Average Power 1280MHz
Low Band, Average Power 1280MHz
ESPI-ESPI@2010-10-18_03-40-28.png (8.52 KiB) Viewed 3873 times
Low Band, Average Power 1280MHz
Low Band, Average Power 1280MHz
ESPI-ESPI@2010-10-18_03-40-28.png (8.52 KiB) Viewed 3873 times
All in all the output power over the low band is around 10-14dBm average and 18-21dBm max power.
High band 7-14dBm averange and 14-20dBm max power.

Mictronics
 
Posts: 63
Joined: Sat Feb 20, 2010 3:16 pm

Re: Wave Bubble 2010

Post by Mictronics »

Forgot one plot, 100MHz sweep from 2400-2500MHz, max power:
100MHz sweep, 2400-2500MHz, max power
100MHz sweep, 2400-2500MHz, max power
ESPI-ESPI@2010-10-18_03-54-56.png (8.92 KiB) Viewed 3871 times

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aqisnotliquid
 
Posts: 117
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Re: Wave Bubble 2010

Post by aqisnotliquid »

The plots look great. I'm waiting for the final go ahead to put out a batch order.

losthorizonmba
 
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Joined: Wed Sep 15, 2010 11:41 pm

Re: Wave Bubble 2010

Post by losthorizonmba »

Please count me in when you order batch of boards. Can make deposit

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javajax
 
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Joined: Thu Aug 12, 2010 6:16 pm

Re: Wave Bubble 2010

Post by javajax »

Let me know when you are doing the batch order I'll go in on it.

akula169
 
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Joined: Tue Jan 17, 2006 10:36 pm

Re: Wave Bubble 2010

Post by akula169 »

Add me to the list as well

razorskiss1000
 
Posts: 1
Joined: Thu May 20, 2010 2:22 am

Re: Wave Bubble 2010

Post by razorskiss1000 »

I would be interested as well. So excited for this.

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jarsnah12
 
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Joined: Sun Nov 28, 2010 2:15 am

Re: Wave Bubble 2010

Post by jarsnah12 »

I too would be interested. Let me know what the final cost would be to add me to the order.

echomike
 
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Joined: Sun Aug 01, 2010 9:27 pm

Re: Wave Bubble 2010

Post by echomike »

also add me!

TheFallen
 
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Joined: Mon Feb 08, 2010 1:28 pm

Re: Wave Bubble 2010

Post by TheFallen »

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.

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