12v 7ah / yaesu 817nd

[stanwendy]

Hi lads , Lots of different answers online and as with radio RX and TX it will only be a Rough guess, I have a yuasa 12v 7ah battery and linked it up to my yaesu 817nd and it was on for quite a few hours , Mixture of rx and tx , Anyway in the near future I'll be doing some portable use , How long roughly will the above battery last , Do I need to sort maybe a different type of battery , Jusf a rough guess would be fine, Thanks,

[Buick Mackane]

I went portable with exactly the same setup a few weeks ago and managed 24 hours run time this was using mostly the 2.5 watt setting. But i ran the battery well below 12 volts which you shouldn't really do as it can damage the battery. A freshly charged battery should read 12.6 volts and you should stop using it when it reaches 12 volts as thats roughly half of its capacity used up

[stanwendy]

Funny enough it was on 12.7v and finished off around 11.7v, It was however on the 5 watts but I will bear that in mind next time, I may take a multimeter with me so I can check how it's going, Next now is another homebase antenna to take portable , Thanks for the above.

[Buick Mackane]

Funny enough it was on 12.7v and finished off around 11.7v, It was however on the 5 watts but I will bear that in mind next time, I may take a multimeter with me so I can check how it's going, Next now is another homebase antenna to take portable , Thanks for the above.

The 817 has a built in voltage meter. When charging your 7ah battery do so at no more than round about one amp, A normal 4 amp (Or above) car battery charger will quickly kill your battery

[Buick Mackane]

Next now is another homebase antenna to take portable , Thanks for the above.

My portable antenna is a EFHW ran through a homebrew tuner, See link below for details, Works a treat.


viewtopic.php?p=553854#p553854

[Ant]

Next now is another homebase antenna to take portable , Thanks for the above.

My portable antenna is a EFHW ran through a homebrew tuner, See link below for details, Works a treat.


viewtopic.php?p=553854#p553854

If it's HW, why the tuner?

[Buick Mackane]

Next now is another homebase antenna to take portable , Thanks for the above.

My portable antenna is a EFHW ran through a homebrew tuner, See link below for details, Works a treat.


viewtopic.php?p=553854#p553854

If it's HW, why the tuner?

Your right if it's the correct length then a tuner isn't needed, But it's good to have it when portable just to iron out any SWR problems caused by near by objects etc