Hi Ray. The Rcvr seems to work well with either regulator. Small glitch this morning, found an untight power connector screw, fixed now.
LIstening post -update
- Thread starter VK3EB
- Start date
If there was space in the case, maybe we could piggy back a usb connection board on the back? as per bellow pdf it looks, there is not much too it, i could make this with suitable mounting holes.
Attachments
It might be good to have input and output terminals at opposite ends of the board, just an idea.
Hi Ray. The strong spur on 3616 appears to be a component of a harmonic series radiating from the modem. I cannot at this stage find the fundamental. The same spur can be found on the following freq. 1718,1750,2066,2583,3099,3616,4133,5166,5683,6717,7233,7751,8784,9301. I am sure that would continue. When calculations are made the following numbers pop out. 32, 316, 517,1033. The modem radiates quite strongly and when testing the range with a portable receiver the harmonics fall to a reasonably low level at about 50 meters. The fence which runs alongside even though it is grounded by all the steel posts picks up and re radiates the harmonics. The receiver is still very good to use generally, Cheers.
The cellular modem will have several of its own internal dc dc stages, as it has quite a wide input voltage. It is probably worth adding ferrites on its dc input as well if they are not there already. (this goes for just about everything these days as the processor voltage are so low.)
The cellular modem need not be local to the sdr. you could place it up to 100m away(if you had power), the shielded ethernet cable I made up is certainly not long enough for that. I can keep an eye out for a roll of cat 6 ethernet cable you can give that a try too to see if it is worth it.
The cellular modem need not be local to the sdr. you could place it up to 100m away(if you had power), the shielded ethernet cable I made up is certainly not long enough for that. I can keep an eye out for a roll of cat 6 ethernet cable you can give that a try too to see if it is worth it.
VK3EB
Active member
Thanks Josh, some good tips. no ferrites on DC just across the battery, we can move the modem and see what happens.
Finished the Anderson power board, rack frame made (thanks Kevin 3KFM for parts) will paint it black, and a 5v LM323 reg supply -quick homebrew half finished will attach a few USB sockets for quick connections
Finished the Anderson power board, rack frame made (thanks Kevin 3KFM for parts) will paint it black, and a 5v LM323 reg supply -quick homebrew half finished will attach a few USB sockets for quick connections
maybe add this usb port controller. I've got a few. can be left un populated.
VK3EB
Active member
Bill, have a new 90Ah battery should be good when the sun don't shine, moded already with terminals
and a fuse.
Also have found the perfect float charger in my junk box.
GV batteries gave me a 10% discount when I told him it was for a Shepp radio club
I've received 2 emails today reporting how great the SDR is performing.
and a fuse.
Also have found the perfect float charger in my junk box.
GV batteries gave me a 10% discount when I told him it was for a Shepp radio club
I've received 2 emails today reporting how great the SDR is performing.
Hi Dallas. The battery looks to be a good one. We will fit the solar panel and regulator as soon as we get the chance. One day soon? let me know, cheers.Bill, have a new 90Ah battery should be good when the sun don't shine, moded already with terminals
and a fuse.
Also have found the perfect float charger in my junk box.
GV batteries gave me a 10% discount when I told him it was for a Shepp radio club
I've received 2 emails today reporting how great the SDR is performing.
View attachment 3250
Even if it runs out of the 20G Data Allowance it will drop the rate down to 1Mbit which is still more than fast enough to operate normally.
VK3EB
Active member
Few changes on the Fly Dog.
- ADC clock adjustment, frequency display now accurate
- loaded a json file (courtesy of Paul VK3KHZ) - thanks Paul. Icon/bookmarks now display call sign on AM MW band, clicking an icon takes you to the station.
- Interesting station on 909kHz for those into MW DX (China ?)
- did you know that 3630kHz is the VK/ZL slow scan TV calling channel?
- ADC clock adjustment, frequency display now accurate
- loaded a json file (courtesy of Paul VK3KHZ) - thanks Paul. Icon/bookmarks now display call sign on AM MW band, clicking an icon takes you to the station.
- Interesting station on 909kHz for those into MW DX (China ?)
- did you know that 3630kHz is the VK/ZL slow scan TV calling channel?