Well, mostly conquered
Jim used a larger value variable capacitor, so his VFO has more frequency coverage ...
Jim has a capacitor that is way more than 50 PF. So it’s time to learn series and parallel capacitance, resonant circuits and probably something else. No, I’m not going to dive into it here, admitingly I have to learn that myself! However, there do seem to be some calculators out and about that should help.
As you can see in the picture his VFO covers a lot more than just the 20 meter band. For some that may be just fine. What it does, though, is limit the ‘resolution’ of your tuning dial. The radio does have a nice fine tune adjustment to compensate for that.
Another big breakthrough
This is the SD 'disk' that we used to update the Flash (U-Boot) on the NGW100. It's an older card that the older U-Boot could handle.
at the Party was the flashing of Das U-Boot. Yah, we have flashing Das U-Boot! Dave sucessfully formatted an SD card the way the NGW100 likes, we moved the Atmel Flash Upgrade Utility to the SD card, and told U-Boot to load the image. It was cool! Took seconds flat and now reports U-Boot 2010.8.
This is important to anyone who has an NGW100 as this upgrades the ‘bootloader’ in the board to be able to read 2GB cards. The U-Boot bootloader that ships preloaded in the card won’t read the cards with large blocks. We’ve been stuck with older cards, usually 64 and 128 MB. Dave had one card that was 1GB with the small block setup. That’s the card we ended up using to load the flash image.
Vern, Ralph and Roy doing what we do at the Tech Party!
We had quite the group for the first Wednesday of the month. Remember there are several other groups that meet the first Wednesday of the month so the Technet and Tech Party are usually kind of light. We did great this week though!
Remember EVERYONE is invited to our group – you don’t have to be involved in any of our current projects to attend. The social value of this group is immeasurable! From time to time the group leader does focus the attention of the group to a specific point, but other than that this is definitely a multitasking group.
Jim, Nate and Bert working on Jims VFO - conquored for the most part, it's on frequency but covers more than the 20 meter band because he used a larger variable capacitor. What we need to do next is calculate the new capacitors to set his bandwidth.
Roy and hbgrlop being entertained by some of the technical magic that happens at every Tech party!
Jims VFO with Vern and Dave in the back
Let the knowledge flow
It is absolutely the best thing in the world to have a room full of Elmers an aspiring techs. Here is Jims VFO showing the large range of coverage he has, with Vern and Dave in the background digging in to their projects.
Here is a closer view
Here's Nate working on Jims VFO. Note the neat setup Nate made with some protoboards and a neat 'laptop' type case he found at Skycraft. This week his creation sported individual switches for each of the power busses, 12, 5 and 3.3v regulators and a lot of spirit for the next run of mods!
of Jims setup and the frequency. Also note the power supply showing 80 mA current at 13.8v. Keep in mind the entire circuit is not powered, just the VFO and display.
See you next week!
Come out to next weeks Tech Party! Log in to the net on 147.120 Wednesday at 8pm if you can’t make it in person. There’s always something good going on and now n then there’s munchies! Never be afraid to bring munchies – you become an instant hero of the 147120 Tech Crew ;]