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Re: Power bank questions
开云体育Hi Ron,My caution is to not confuse watts with watt-hours.? Getting a 300w unit only tells you the maximum instantaneous AC power that the unit will deliver, but provides no information on how long that delivery can be maintained.? So saying "A 300W unit can last a long time" does not make sense.? Watts has no concept of time; it's watt-hours that matters. There can be a rough correlation between the higher power (higher watts) with larger batteries (more watt-hours), but that's only cursory.? When choosing a unit, one needs to understand both the maximum output needed (watts), and total capacity (watt-hours).? Marketing-savvy manufacturers may couple a large cheap (modified sine wave) inverter with the smaller battery, preying on this confusion, with the ad copy focusing on the former and ignoring the later.? The general public often doesn't think about the difference, and because of the lower cost may get a unit that won't meet their needs. Interestingly, you will very often find units that offer 88 watt-hours of total capacity or slightly less; I believe that's the maximum for some international shipping and airline travel reasons. Greg? KO6TH Ron Wright via groups.io wrote:
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Re: Power bank questions
Greg, Obviously one would not get one of these power packs to run like a refrig or heater.? I got a 300W unit to run my soldering gun for events like putting together Field Day.? Works great. Yes, one needs to look at the capacity for your needs.? And many can power a rig like a FT817 and also charge for a long time ones cell phone.? A 300W unit can last a long time. The point is there are power packs for many portable use that will supply needed power.? Some of these power packs even have wireless charges on top.
On Tuesday, March 11, 2025 at 09:04:48 PM EDT, Greg D via groups.io <ko6th.greg@...> wrote:
Mmmm, careful.? At 88 watt-hours, that's barely more than 7ah at
12v, not counting internal conversion losses.? The inverter may be
able to source 100 or 300 watts, but not for long.? 300 watts from
an 88 watt-hour battery will drain it in something like 15 minutes.?
Of course the FT-817/818 draws considerably less - you'd likely get
5+ hours of use - but there's no Tardis-derived magic here.? Start
plugging other stuff in, and the run time can drop very quickly. When looking at these "Solar generators", the important spec to look at is the watt-hour rating of the battery.? The AC output spec is just for the inverter; it's a limit for how much (peak) power can be drawn, not for how long. Greg? KO6TH Ron Wright via groups.io wrote:
Martin,
Yes there a lots of power
banks that put out USB power and 12VDC power and also 120VAC
power, all in one battery box.? I have 2 with 120VAC output
along with USB and 12VDC outlets.? They come in a verity of
power levels, mine are 100 & 300W.
There are other that can
power a FT817 for hours that put out USB and 12VDC.
Here is one on Amazon.? No
tsure if you need 120 or 240VAC.
On Tuesday, March 11, 2025 at 08:05:32 PM EDT, Kevin -
K5KTM via groups.io <ktmullens@...>
wrote:
Nice that it’s multi-use but that thing is huge.?
Kevin -K5KTM
On Mar 11, 2025, at 13:52, Martin HB3YDM via groups.io <hb3ydm@...> wrote:
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Re: Power bank questions
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Re: Power bank questions
Am using this with some success
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Using the usb-c pd output it maintains a pretty steady 12v through most of its discharge cycle.
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I wanted a 5 amp rated 12V cable so use this?
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I actually butchered it to put an anderson connector on it instead of the 5.5 mm barrel plug. Have an Anderson connector on the back of my 818ND.
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Has a torch, charges a phone and solidly built.....actually a pretty good safety device to have in the bush.
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Might also try one of these for emergency back up which should be up to the job though smaller capacity.
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https://sandberg.world/en-gb/product/survivor-powerbank-10000-pd30w
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B
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Re: Power bank questions
I really like the RoyPow. I chased one down refurbishes then my brother, who is also a ham, apparently ran into them independently and got me another one for christmas to use with my FT817 and other handheld gear. It has one USB-C in or out (used to charge or can be connected?to a device while not charging) and two high capacity standard USB ports, a 12v/5a coaxial output and a 12v/10a accessory style plug output. rated at 86Wh I used one in the deer blind this year to occasionally power my 12v electric blanket.? SW On Tue, Mar 11, 2025 at 9:48?AM Daniel Vianna via <py2tdb=[email protected]> wrote:
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Re: Power bank questions
开云体育Mmmm, careful.? At 88 watt-hours, that's barely more than 7ah at 12v, not counting internal conversion losses.? The inverter may be able to source 100 or 300 watts, but not for long.? 300 watts from an 88 watt-hour battery will drain it in something like 15 minutes.? Of course the FT-817/818 draws considerably less - you'd likely get 5+ hours of use - but there's no Tardis-derived magic here.? Start plugging other stuff in, and the run time can drop very quickly.When looking at these "Solar generators", the important spec to look at is the watt-hour rating of the battery.? The AC output spec is just for the inverter; it's a limit for how much (peak) power can be drawn, not for how long. Greg? KO6TH Ron Wright via groups.io wrote:
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Re: Power bank questions
Martin, Yes there a lots of power banks that put out USB power and 12VDC power and also 120VAC power, all in one battery box.? I have 2 with 120VAC output along with USB and 12VDC outlets.? They come in a verity of power levels, mine are 100 & 300W. There are other that can power a FT817 for hours that put out USB and 12VDC. Here is one on Amazon.? No tsure if you need 120 or 240VAC.
On Tuesday, March 11, 2025 at 08:05:32 PM EDT, Kevin - K5KTM via groups.io <ktmullens@...> wrote:
Nice that it’s multi-use but that thing is huge.? Kevin -K5KTM On Mar 11, 2025, at 13:52, Martin HB3YDM via groups.io <hb3ydm@...> wrote:
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Re: Power bank questions
开云体育Nice that it’s multi-use but that thing is huge.?Kevin -K5KTM On Mar 11, 2025, at 13:52, Martin HB3YDM via groups.io <hb3ydm@...> wrote:
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Re: Power bank questions
Two ordinary 5 volt power banks of sufficient ah ratings wired in series creates 10 volts which is about the ideal voltage for the radio.
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Joe n1khb?
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Re: Power bank questions
There is USB-C, the connector standard, and USB-C PD which supports higher voltages and current ratings (like charging laptop batteries).
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If I understand the OP's desire, he wants a power bank that outputs proper voltages for both their cellphone and their FT-817.
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TalentCell has some interesting power banks, like this:
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But this particular model lacks a high-current/high-voltage USB-C PD port...
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Personally I'd prefer something like this:
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- A Bioenno 9 Amp LiFePO4 battery & charger (still on BOGO at $115 plus shipping for TWO batteries and TWO chargers)
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- This PowerWerx USB-C QC adapter: $30
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- A powerpole panel mount to power the FT-817
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- A small Harbor Freight case, like this:
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Yes, that takes you to $200, but if you can find a friend to split the BOGO deal on the battery, you're now under $150 for a great, robust power solution.
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Hope this helps,
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Ken, N2VIP
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Ken
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Re: Power bank questions
What modes you use? Does the power bank or the cable heat up? Em ter., 11 de mar. de 2025, 11:03, sharudin senapi via <aidiesha=[email protected]> escreveu:
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Re: Power bank questions
Hi
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I am using Power Delivered USB C that can produce 12v to my 817 73 9w2d On Tuesday, March 11, 2025, 9:59 PM, NE1AM - Ryan via groups.io <ryan.ruby@...> wrote:
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Power bank questions
I was wondering if it is possible to have a power bank?to charge my phone (while hiking) and also to have it as a backup power source for the?Yaesu. Not only voltage and current ratings on websites like Amazon are confusing (and probably wrong),?but I'm also insecure if a USB-C to DC cable would?handle the?~2.6 A current the?Yaesu uses to TX?(I use a lot of FT8).? Is it possible to have a power bank to meet my needs? What kind of criteria should I look for? Daniel PY2TDB. |
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Re: Antenna question
Wow..I didn't know it was so lossy! Out of curiosity: the case of one radiator, where does the 2/3 of the power go? Daniel PY2TDB. Em dom., 9 de mar. de 2025, 17:06, James Todd via <toddjam=[email protected]> escreveu:
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Re: Antenna question
Daniel:
If black is the radio, which is about 20 cm, they are functionally equivalent. ?Neither is optimal, however due to the radiator of the antenna you described being shortened by about 1/3 relative to a 1/4-wave radiator and there being only one radial. A few more radials in this configuration could add a few more dB to your signal. Basically, with one radial, you're cutting effective power to less than a third. I'm assuming a vertical radiator and 1/4 wave radial at 90 degrees.? ?
Number of 1/4λ Radials and approximate?ERP?
Jim
WB0KWJ
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Kevin - K5KTM
Martin HB3YDM
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