MY QO100 SETUP

Hi,

This is some info regarding my QO100 setup for RX & TX.

George SV1BDS

This is the LO based on an eBay PCB and a ATTINY13A that has a modifided source code from vhfdesign.com to include

309 MHz for RX Lo. For TX it produce 2831 MHz and 1969,5 MHz. If any wants the source code I can post it.

Hi,

By current block diagram.

LO MMIC amplifier based on W1GHZ PCB using a SGA6389

Hi,

I use some interdigital filters originaly for 2.5-2.7 GHz tuned to 2.3-2.5 Ghz. I also test some 28 mm pipe cups (13 mm probe length) that are more narrow but more sensitive to drift due to mechanical reasons. I plan to use some SMD filters from Farnell Link

Hi,

My feeder based in a surplus 3 turn LHCP antenna. A brass triangle is used to drop SWR to -20 dB at 2.4 GHz. It produce 30 dB over noise signal and only 3 dB down from CW beacon using the 80 cm dish and about 3W.

Hi,

This is a lab step attenuator based on a eBay PCB PE4302 with 31.5 dB max attenuation with 0.5 dB step up to 4 GHz. Thanks to SV1EED for writing the source code to a ATMEGA8.

The MURATA BPF is build. i2NDT if you need more info tell me.

It must be shielded ...

Hi, this is a SBB5089 MMIC amplifier giving 19 dB gain 20 dBm output @ 2.4 GHz. PCB personally designed based on W1GHZ PCB.

BPF & SBB5089 placed at roof box

Bias tee, working from 100 MHz to 3GHz at least. L= 82 nH , 2*C = 10 nF

These are the init values. It is based on a personally based PCB so I create 2 of them for the moment. One low freq version with 10 uH & 10 nF which is usable from 1 MHz to 1 GHz without loss and loose 5 dB at 3 GHz. The second with 100pF and 82 nH usable from 100 MHz to 3 Ghz.

DC-block, personally designed PCB, with 10 nF capacitor.

UPconverter mixer with MAX2671 is working !!! Now with -5 dBm instead of -20 dBm with the previous mixer and the most importand with USB & 1970 MHz LO.

Some links that may be interesting:

Dummy load 50 ohm 6 GHz 0.5W

250W 30dB 2 GHz attenuator

Directional coupler 1.2 - 6 GHz

SMD dummy load 6 GHz

Attenuator 250mW 6 GHz

ADF4351 microwave generator

i2NDT the Murata LFB2H2G45SG7C093 needs decoupling capacitors at both input and output as it has low resistance, to ensure that no short circuit will occur.

Mixer shielded, may be must go to the jokes section ... Hi Hi !!!

But it works ...

Hi,

A AD8302 dB diff & phase is build based on a eBay ready PCB which display also SWR. A ATMEGA8 displays on a 2*16 LCD.