The "Other" Eden Project : Under Way - 1
This "Eden Project" is an Eden Valley Radio Society project to construct from scratch a 70MHz QRP SSB transceiver.
The SSB is generated using the "filter method" with an IF of 11.0592MHz.
Ron Taylor G4GXO of Cumbria Designs has produced the design for us all to try to replicate and get going.
The three-way header plug nearest to the camera is for the receiver volume control pot.
No PCB has been produced, the objective is to build it from scratch using just PCB laminate.
This is a variation on the "Manhattan" method - IC's and associated components are built on small PCB "pads", with the remainder in a "point-to-point" style.
Some "dead bug" (also known as "Ugly") methodology is no doubt going to creep in here too.
The stages nearly completed so far are the RX product detector (short of its crystal at the moment), the AF pre-amp and the AF output stage.
When these stages are finished, it will be time to put the ICs in their sockets, power up, test and de-bug.
This is the first time I have used this method of construction, and I'm learning as I go - you certainly get very close to the circuit with this method!
Previously projects have used either PCB (pre-manufactured in the case of kits, or occasionally home-made) or Veroboard. I'm not the neatest worker in the world, as you can see!
The empty space at the top is to accommodate the TX modulator (left) and the Mic preamp (right)
There is a photo of Ron presenting his creation at the 2009 G-QRP Club Convention at Rishworth - Rishworth
The "Other" Eden Project : Under Way - 1
This "Eden Project" is an Eden Valley Radio Society project to construct from scratch a 70MHz QRP SSB transceiver.
The SSB is generated using the "filter method" with an IF of 11.0592MHz.
Ron Taylor G4GXO of Cumbria Designs has produced the design for us all to try to replicate and get going.
The three-way header plug nearest to the camera is for the receiver volume control pot.
No PCB has been produced, the objective is to build it from scratch using just PCB laminate.
This is a variation on the "Manhattan" method - IC's and associated components are built on small PCB "pads", with the remainder in a "point-to-point" style.
Some "dead bug" (also known as "Ugly") methodology is no doubt going to creep in here too.
The stages nearly completed so far are the RX product detector (short of its crystal at the moment), the AF pre-amp and the AF output stage.
When these stages are finished, it will be time to put the ICs in their sockets, power up, test and de-bug.
This is the first time I have used this method of construction, and I'm learning as I go - you certainly get very close to the circuit with this method!
Previously projects have used either PCB (pre-manufactured in the case of kits, or occasionally home-made) or Veroboard. I'm not the neatest worker in the world, as you can see!
The empty space at the top is to accommodate the TX modulator (left) and the Mic preamp (right)
There is a photo of Ron presenting his creation at the 2009 G-QRP Club Convention at Rishworth - Rishworth