external battery

Qsorder - Contest audio recording for N1MM. external "plug-in" which adds a QSO audio recording function.

LinPac packet radio terminal - Linpac is an extensible Linux packet terminal that supports easy access to concurrent connections (streams), PBBS/FBB forwarding, and support for adding external commands

Solar panels test - Solar panels test for portable battery charger by YO4HHP

Home Brew 9 Volt Battery Clip - Make your own battery clip by nj2x

ZL2PD CMOS Keyer - Two cheap CMOS ICs and a few transistors was all that was required to rebuild an elderly TTL automatic morse keyer into a low current lightweight battery powered iambic morse keyer.

Find RFI causes in mobile operations - Troubleshooting your power supply, in determinig connections to battery, alternator and regulator interference and checking power supply leads.