MY QO100 SETUP

Quote from SV1BDS

Hi, anyone try this 1W amplifier ?

Hi,

The amplifier was lab tested. I get +28 dBm (640 mW) that is the maximum output power. It needs a heat sink under the PCB for operation. It seems it has about 30 dB gain with good linearity. You have to put +5V at EN pin to operate as was mentioned. It seems a nice solution for directly driven by Pluto.

Quote from iw5bsf

Hi interesting George, a question that I have to check with my tx's ptt if the 144MHz tx transverter then in sequence the 500 milliwatts to drive the amplifier andrews and what voltage should be sent in tx 28v or polarization bias irq?

73 de Roberto

Sorry I can not understand you.

iw5bsf you can use a simple circuit with a mosfet to control amplifier voltage via PTT. There are circuits available at the forum.

My proposal (not tested):

Hi,

A VOX circuit to provide PTT from 1W SSB UHF without power supply.

Hi,

A 4 way 25 MHz splitter is build to drive the ADF4351 and SI5351A LAB generators except the two existing ADF4350 for QO100.

iw5bsf what is the total current of all these stages?

Hi,

This is a LAB version of a 10 MHz to 40 MHz (*4) multiplier for using it to clock the Pluto. It is passive.It is a multiplier by 2 using a bifilar bead and two BAT85 , a 2 * 20 MHz xtal filter and one more similar by 2 multiplier. It was not tested for driving Pluto yet.

Hi,

The circuit diagram of the optimized design. With 15 dBm input -10 dBm is produced.

Quote from SV1BDS

Hi, a pluto question. I try to setup a USB2.0 Ethernet AX88772 adapter but it does work. I try the adapter to my PC and it works. I also use a tested OTG adapter. Power is feeding the Ethernet adapter. The problem is that it does not light the ethernet link led at my switch. I put this config :

[USB_ETHERNET]

ipaddr_eth = 192.168.1.99

netmask_eth = 255.255.255.0

Any ideas - proposals ?

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Hi

After a lot of tests, a reflow on the Ethernet adapter IC solved the problem.

Hi,

A USB GNURadio tranceiver is build for QO100 using Pluto via LAN. Feutures:

- direct frequency entry from 2* waterfall

- imidiate frequency change

- RIT

- PPM corection

- PTT switch (no Tx power controll...)

- full band waterfall

- 16 KHz waterfall @ received frequency

- audio FFT

Quote from iw5bsf

ok 3.5 Amper

The IRF4905 circuit must be OK if you use a heatsink for it and a 7808 or similar solution for 8V.

Hi,

Helix antenna is updated adding ground as it was small. A few (2-3) dB is gained.

Quote from iw5bsf

thank George

73 de Roberto

iw5bsf if you try it tell me the results.

Hi,

Pluto modified for external clock using the UFL method. At -33 dBm with 40 MHz clock, it is stop working.