ΜBITX: Difference between revisions
From FirespeakerWiki
Jump to navigationJump to search
Firespeaker (talk | contribs) Created page with "Notes on µBITX assembly and use. == Assembly == Used a cookie tin as a case. Mic assembly. == Antenna setup == Inverted V dipole made with Amateur Radio Supplies [https:..." |
Firespeaker (talk | contribs) No edit summary |
||
| Line 3: | Line 3: | ||
== Assembly == | == Assembly == | ||
Parts that took some time to decide on approach to: | |||
* Case: used a cookie tin as a case. | |||
* Mic assembly: TODO | |||
Still planned: | |||
* check power output on various bands | |||
* get on the air! | |||
== Antenna setup == | == Antenna setup == | ||
Inverted V dipole made with Amateur Radio Supplies [https://www.amateurradiosupplies.com/product-p/20405.htm 20m dipole antenna wire] (two 18' strands, trimmed, wrapped around insulators, strung up in attic) and 450Ω window line. | Inverted V dipole made with Amateur Radio Supplies [https://www.amateurradiosupplies.com/product-p/20405.htm 20m dipole antenna wire] (two 18' strands, trimmed, wrapped around insulators, strung up in attic) and 450Ω window line. | ||
* Originally was sent two 16ft strands, which is really too short. Customer service was great and sent me the 18ft strands and a prepaid return envelope for the 16ft strands. | |||
QRPGuys [https://qrpguys.com/multi-tuner Multi Z Tuner] | QRPGuys [https://qrpguys.com/multi-tuner Multi Z Tuner] | ||
* See my [[QRPGuys Multi Z Tuner|notes on assembly for the Multi Z Tuner]] | |||
QRPGuys [https://qrpguys.com/12w-dummy-load-power-meter 12W dummy load] | QRPGuys [https://qrpguys.com/12w-dummy-load-power-meter 12W dummy load] | ||
* Items from QRPGuys took about 2 weeks from date of order to arrive. | |||
== Mods == | == Mods == | ||
Applied during assembly: | Applied during assembly: | ||
* Added a fuse before diode (succeeded | * Added a fuse before diode (succeeded, afaict) | ||
Attempted after tested working: | Attempted after tested working: | ||
| Line 32: | Line 39: | ||
* Foot-pedal controlled TX | * Foot-pedal controlled TX | ||
* Some sort of audio pre-processing? | * Some sort of audio pre-processing? | ||
* Leveling out power? | |||
* Fix filters?? | |||
* Use CEC firmware | |||
[[Category:Amateur Radio]] | [[Category:Amateur Radio]] | ||
Revision as of 04:20, 13 August 2018
Notes on µBITX assembly and use.
Assembly
Parts that took some time to decide on approach to:
- Case: used a cookie tin as a case.
- Mic assembly: TODO
Still planned:
- check power output on various bands
- get on the air!
Antenna setup
Inverted V dipole made with Amateur Radio Supplies 20m dipole antenna wire (two 18' strands, trimmed, wrapped around insulators, strung up in attic) and 450Ω window line.
- Originally was sent two 16ft strands, which is really too short. Customer service was great and sent me the 18ft strands and a prepaid return envelope for the 16ft strands.
QRPGuys Multi Z Tuner
QRPGuys 12W dummy load
- Items from QRPGuys took about 2 weeks from date of order to arrive.
Mods
Applied during assembly:
- Added a fuse before diode (succeeded, afaict)
Attempted after tested working:
- Mitigating heat on LM7805:
- Added a small 5V switching power supply before LM7805 (failed; created too much noise)
- Relocation of LM7805 to case (succeeded, but got leads switched the first time and smoked the nano)
- Dim LCD (failed—no effect)
Plan to attempt at some point:
- TX LED
- SWR meter
- Red-on-black display (for night-time operation)
- Foot-pedal controlled TX
- Some sort of audio pre-processing?
- Leveling out power?
- Fix filters??
- Use CEC firmware
