When cordless tools came out, they were all Ni-Cad. I had to tape up the drill switch to fully discharge it before recharging. Im so thankful I dont need to use those anymore! Next were Nickel Metal Hydride batteries,so much better. Batteries have come a long way in 35 years!
Thank you John for asking the question and Dave for answering it. I'm doing something very similar by creating a portable repeater due to a recent electrical outage, and this helps. There are some differences in what I am using (e.g. using terminal connectors instead of anderson) but in the end, this still helps.
No, a Coulomb is 6.25e18 electrons if I recall. An amp is 1 Coulomb/second. This question came up in honors chem when I was 17. I learned it on my own from a healthkit training manual around age 11. And that's about when I decided public school was a complete waste of time. And that's why I'm a GED / Ph.D....
One thing you did not totally discuss that I think would really help with understanding of this topic is drawing more current than the battery's amp hour rating. You walk all around it and just briefly touched on it but did not spell it out. Not only will a 10 amp hour batter supply 10 amp for 1 hour it will also supply 20 amps for a half hour (30 minutes) or 40 amps for 1/4 hour (15 minutes), of course this is depended on the battery maximum discharge ratings which you did mentioned but didn't really drive home.
I have an FT-7800R in my shack. Great little radio. And it is set up exactly like the FT60r,. It programs the same way, has the same memory bank operation etc. The FT-7800R is getting hard to find as they are discontinued, but if you can grab one, Do it..
I think you were thinking of Avogadros number which is about 6e23 for how many molecular weight of something is required to have a mole of it... where 1 mole by definition is a gram. E.g. 1 ml of water weighs 1 gram... so that's a mole of O atoms and 2 moles of H atoms because water molecules are molecular weight 16+1+1 = 18. Unless there's deuterium or tritium in the water... hydrogen isotopes... ;). There's about 1.1 grams of deuterium in 1 m^3 of sea water btw...
A modern nuclear submarine has a fission reactor, a diesel engine, and batteries (in my day, lots of the lead-acid type). Under normal conditions, the reactor and its associated systems make high pressure steam -- yes, a nuclear sub's primary engines and primary electricity generation plants are steam powered. The diesel is for emergencies and can only be used safely when the crew can get an air intake above the surface of the water. Batteries are for when neither the reactor nor the diesel can be used.
@@keelieyohara7246 Not actually boiled in the reactors though. It's kept under such great pressure that it can't boil in the reactor itself, only in the steam generators. But yes, they are great at making heat.
@@ericdee6802 wow ! My father was officer on USS Blackfish 1943-45 in same area. He had enormous respect for the CW operators. The boat (that’s what he called it) was nearly sunk by depth charges off Formosa, mines near Hong Kong.
Good job as always on the video Dave except for one minor technical issue. The spec's for the 7800 quote 8.5 Amps current draw at Full TX power (50 Watts output). You suggested 25 Watts output and quoted 15 Amps current draw (15 Amps x 13.8 Volts = 207 Watts, Not very efficient!). Based on the 7800 spec's, 25 Watts RF output should draw approximately 4.25 amps. Take care Dave. 73 Gord. ve7uy.
Stay away from Anderson power connectors and alike. Do anything else to connect your equipment to power. Over time, these connectors do not form a solid connection. In a matter of weeks you will find voltage drops when drawing current from equipment that had originally appeared to have a reliable connection. My opinion has been formed by many years using these connectors for amateur radio equipment.
I really appreciate the detailed breakdown. Thanks, David!
Great video
Very helpful. Thanks Dave!
When cordless tools came out, they were all Ni-Cad. I had to tape up the drill switch to fully discharge it before recharging. Im so thankful I dont need to use those anymore! Next were Nickel Metal Hydride batteries,so much better. Batteries have come a long way in 35 years!
Nice............. ❤️
Thank you John for asking the question and Dave for answering it. I'm doing something very similar by creating a portable repeater due to a recent electrical outage, and this helps. There are some differences in what I am using (e.g. using terminal connectors instead of anderson) but in the end, this still helps.
No, a Coulomb is 6.25e18 electrons if I recall. An amp is 1 Coulomb/second. This question came up in honors chem when I was 17. I learned it on my own from a healthkit training manual around age 11. And that's about when I decided public school was a complete waste of time. And that's why I'm a GED / Ph.D....
One thing you did not totally discuss that I think would really help with understanding of this topic is drawing more current than the battery's amp hour rating. You walk all around it and just briefly touched on it but did not spell it out. Not only will a 10 amp hour batter supply 10 amp for 1 hour it will also supply 20 amps for a half hour (30 minutes) or 40 amps for 1/4 hour (15 minutes), of course this is depended on the battery maximum discharge ratings which you did mentioned but didn't really drive home.
Very helpful, thanks!
Yaesu is still using Ni-Cad in some radios like the ft-60 and 818.
You should included whatever you think you might need. Your "might need" probably isn't my "might need".
I have an FT-7800R in my shack. Great little radio. And it is set up exactly like the FT60r,. It programs the same way, has the same memory bank operation etc.
The FT-7800R is getting hard to find as they are discontinued, but if you can grab one, Do it..
My Ranger RCI 2970N4 uses those Anderson power connectors, very nice tight positive connection!
I think you were thinking of Avogadros number which is about 6e23 for how many molecular weight of something is required to have a mole of it... where 1 mole by definition is a gram. E.g. 1 ml of water weighs 1 gram... so that's a mole of O atoms and 2 moles of H atoms because water molecules are molecular weight 16+1+1 = 18. Unless there's deuterium or tritium in the water... hydrogen isotopes... ;). There's about 1.1 grams of deuterium in 1 m^3 of sea water btw...
A modern nuclear submarine has a fission reactor, a diesel engine, and batteries (in my day, lots of the lead-acid type). Under normal conditions, the reactor and its associated systems make high pressure steam -- yes, a nuclear sub's primary engines and primary electricity generation plants are steam powered. The diesel is for emergencies and can only be used safely when the crew can get an air intake above the surface of the water. Batteries are for when neither the reactor nor the diesel can be used.
My Father was deployed on the U.S.S.Redfin (Gato class) sub in the South Pacific 1942.🇺🇸
Nuclear reactors are a great way to boil water!
KE0ZMW
@@keelieyohara7246 Not actually boiled in the reactors though. It's kept under such great pressure that it can't boil in the reactor itself, only in the steam generators. But yes, they are great at making heat.
@@ericdee6802 wow ! My father was officer on USS Blackfish 1943-45 in same area. He had enormous respect for the CW operators. The boat (that’s what he called it) was nearly sunk by depth charges off Formosa, mines near Hong Kong.
when the fcc talks about the "art of radio", this is what theyre talking about. well done
Good job as always on the video Dave except for one minor technical issue. The spec's for the 7800 quote 8.5 Amps current draw at Full TX power (50 Watts output). You suggested 25 Watts output and quoted 15 Amps current draw (15 Amps x 13.8 Volts = 207 Watts, Not very efficient!).
Based on the 7800 spec's, 25 Watts RF output should draw approximately 4.25 amps.
Take care Dave. 73 Gord. ve7uy.
Iirc 6.02 x 10^23
Go Dave go. Love your content
Going gets you nowhere. Stay, stay and enjoy all you own instead of the little you can carry.
Stay away from Anderson power connectors and alike. Do anything else to connect your equipment to power. Over time, these connectors do not form a solid connection. In a matter of weeks you will find voltage drops when drawing current from equipment that had originally appeared to have a reliable connection. My opinion has been formed by many years using these connectors for amateur radio equipment.
Hello Stephen,
Please describe some of your experiences so I can better understand why to stay away from Anderson power connectors.
Great refresher Dave. Glad you are covering this. KE0ZMW
Thank you. N0QFT