Thanks All,
i will add two more cells to the pack and look into the LDDA batteries. I have 10 eneloops so good for the moment
All advice much appreciated
cheers
Tony
|
I use LADDA cells too. They work well.
--
Mike G8GYW
|
Hi guys , I already talked (a few years ago)? about the LADDA 2450 mA from IKEA are also a good choice and cheaper than the? eneloop.?? Still ok? after 4 years of? use.? just took care about the sleep-stock charging level when not used.? 73. Patrice.
Your NiMh pack will work well. It's obviously limited by the capacity and quality of the cells but, for the length of time you're intending to operate, they'll be absolutely fine. The radio will default to a maximum of 2.5 Watts when the battery voltage drops but you can force it back to 5 Watts by cycling by through the power settings until the power output icon blinks.?
I have used the "LADDA" branded NiMh cells from IKEA. They're identical in performance to Eneloop Pro cells but cost considerably less. They're made in the same factory in Japan as the Eneloops.
|
Your NiMh pack will work well. It's obviously limited by the capacity and quality of the cells but, for the length of time you're intending to operate, they'll be absolutely fine. The radio will default to a maximum of 2.5 Watts when the battery voltage drops but you can force it back to 5 Watts by cycling by through the power settings until the power output icon blinks.?
I have used the "LADDA" branded NiMh cells from IKEA. They're identical in performance to Eneloop Pro cells but cost considerably less. They're made in the same factory in Japan as the Eneloops.
|
There should be no real difference between the NiMh Enloops and the 817 battery pack other than voltage.? The NiMh batteries have a very low internal resistance and thereby can have a very high discharge rate.? The Enloops I believe are about 2700mAh so other than the voltage of you pack being lower, it should work well.
toggle quoted message
Show quoted text
On Thu, Apr 11, 2024 at 10:23 AM, Tobias KK7BCO/2M0TFF <feltusfecit1@...> wrote: Tony,
I think the shortcoming of this solution may be the voltage and discharge current rate. Your battery pack will probably provide similar power to the original NiMh pack, which means you will be limited to the middle power setting (i.e. not 5w).?
I have a Windcamp battery in mine, which stays just above 11v for multiple 1h activations, and it permits full power output. It is worth noting that when you are below 12v the power icon will blink at 5w: this is normal. I read somewhere that 11.4v is what the ft-817 likes to run most efficiently, which is why the Windcamp pack is set for that voltage area. I have no idea if there is any truth in this.
So, if you were to add two more cells to your pack, you would get better performance. But you will still be limited by the current draw rate of those cells which are probably not designed to output much current. I have seen a lot of people use 3x 18650 cells, which kind of fit in the battery bay. Or the Windcamp setup is very tidy and works well. With 18650s you can buy a regulator from ebay or amazon for a 3 cell setup, which allows you to charge them from any 12v source... And the batteries can be bought new or taken from old tools or laptops. Usually a battery pack fails because one cell falls out of line, leaving the others in good shape.
73.
|
Tony,
I think the shortcoming of this solution may be the voltage and discharge current rate. Your battery pack will probably provide similar power to the original NiMh pack, which means you will be limited to the middle power setting (i.e. not 5w).?
I have a Windcamp battery in mine, which stays just above 11v for multiple 1h activations, and it permits full power output. It is worth noting that when you are below 12v the power icon will blink at 5w: this is normal. I read somewhere that 11.4v is what the ft-817 likes to run most efficiently, which is why the Windcamp pack is set for that voltage area. I have no idea if there is any truth in this.
So, if you were to add two more cells to your pack, you would get better performance. But you will still be limited by the current draw rate of those cells which are probably not designed to output much current. I have seen a lot of people use 3x 18650 cells, which kind of fit in the battery bay. Or the Windcamp setup is very tidy and works well. With 18650s you can buy a regulator from ebay or amazon for a 3 cell setup, which allows you to charge them from any 12v source... And the batteries can be bought new or taken from old tools or laptops. Usually a battery pack fails because one cell falls out of line, leaving the others in good shape.
73.
|
Re: Digital mode on FT-817
OK my thanks to Paul and Dave for their comments.
This has been a bit of a tour of the FT-817ND radio.
So as I explored:
- on LSB digital modes the filter was centered at 2000 Hz
- on USB digital modes, the filter was centered on 1000 Hz
As expected, to use the 6 pin mini-din for HF SSB I need ot be?in digital mode.
As Dave and paul noted I need to have NAR on.
So to fix this:
- menu 26, selected USER-U as digital mode
- menu 27, set digital shift to -500 Hz
- saved
Still had problem.
- menu 27 set to 0 Hz
- saved
issue?was resolved.
My perception is that a digital offset setting was in place but not visible for the menus and the setting?and resetting?the value fixed it.
My thanks to all Dave and Paul.
I have been doing some testing with FLDIGI.
I bought the unit used, and believe I have the 3 crystal filter set installed.
When the node is digital mode it looks like there is a 500 Hz filter centered at 2000 Hz.
Using ISB mode I still get 5 watts out, but it looks like there is 3000 bandwidth.
Any sense of what is going on?
Thanks!
|
Thanks for the clarification, I was wondering about the noise implications.
That helps,
cheers
Tony
|
Brilliant
Thank you very much
Andy
|
Just thought I would clarify. He is not using a power supply as you are referring to. If you read his question more thoroughly, he is referring to his Battery Pack as a external power supply. I have never heard of noise from a battery pack unless one uses a boost or bucking voltage converter in it. Which he has not mentioned. He is using 8 -1.2 volt Eneloop brand cells.
Clyde KC7BJE?
|
Hello,? here are the dimensions of the spring. Regards A.B.A Tecnhologies?
You might try the springs from a ball point pen. Ron, AA5NI.......
On Wednesday, April 10, 2024 at 07:01:43 AM CDT, Andy Kerrison < drewk101@...> wrote:
Anyone know what size ( diameter and length ) the two little springs for the battery compartment latch are?
I’ve lost mine and am looking to see if I can find some before calling Yaesu.
|
You might try the springs from a ball point pen. Ron, AA5NI.......
On Wednesday, April 10, 2024 at 07:01:43 AM CDT, Andy Kerrison <drewk101@...> wrote:
Anyone know what size ( diameter and length ) the two little springs for the battery compartment latch are?
I’ve lost mine and am looking to see if I can find some before calling Yaesu.
|
Hi,
Unfortunately, your signal may be heavily polluted with noise
from the power supply. I had something like this. Particularly
visible and easy to notice with digital mods. Sometimes it is
worth seeing what our signal looks like, for example by using
receivers available on the Internet. My problems were caused by
insufficient current capacity of the power supply. Good as a
charger, too weak for transmitting.
Another power supply may be a generator of impulse noise if it
has insufficient filtration. And so on...
73
Jacek SP5OSF
W dniu 10.04.2024 o?15:18, Tony - M7EUI
pisze:
toggle quoted message
Show quoted text
Hi,
Am enjoying goping through the many informative posts here.
Quick question:
I created an external power supply using an 8 X AA Tray and 8 1.2V
eneloop NiMH batteries. Max power is 5W on FM and SSB with the
tray plugged into the external DC input using the Yaseu power
cable.
I already had the charger and batteries so thought I would try
this before looking to buy anything else. My roving sessions are
usually only an hour or two at most.
Are there any potential issues with this external power supply
other than the relatively short life of the batteries - the
supplied cable has a fuse.
Am thinking of using the supplied rechargeable battery or a spare
set of eneloops.
cheers
Tony
|
Hi,
Am enjoying goping through the many informative posts here.
Quick question:
I created an external power supply using an 8 X AA Tray and 8 1.2V eneloop NiMH batteries. Max power is 5W on FM and SSB with the tray plugged into the external DC input using the Yaseu power cable.
I already had the charger and batteries so thought I would try this before looking to buy anything else. My roving sessions are usually only an hour or two at most.
Are there any potential issues with this external power supply other than the relatively short life of the batteries - the supplied cable has a fuse.
Am thinking of using the supplied rechargeable battery or a spare set of eneloops.
cheers
Tony
|
Anyone know what size ( diameter and length ) the two little springs for the battery compartment latch are?
I’ve lost mine and am looking to see if I can find some before calling Yaesu.
|
Re: Digital mode on FT-817
Possibly.
I will check.
Thanks!
toggle quoted message
Show quoted text
On Apr 8, 2024, at 11:31?AM, KM4JHK paul <paul2700work@...> wrote:
?
Similar to above? Could it be the NAR setting?
I have been doing some testing with FLDIGI.
I bought the unit used, and believe I have the 3 crystal filter set installed.
When the node is digital mode it looks like there is a 500 Hz filter centered at 2000 Hz.
Using ISB mode I still get 5 watts out, but it looks like there is 3000 bandwidth.
Any sense of what is going on?
Thanks!
|
Re: Digital mode on FT-817
Hi Don You have to select nar in CW in the menu, also open the radio and look to see what filters are fitted, just so yo do know, Dave 2E0DMB?
I have been doing some testing with FLDIGI.
I bought the unit used, and believe I have the 3 crystal filter set installed.
When the node is digital mode it looks like there is a 500 Hz filter centered at 2000 Hz.
Using ISB mode I still get 5 watts out, but it looks like there is 3000 bandwidth.
Any sense of what is going on?
Thanks!
|
Re: Digital mode on FT-817
Similar to above? Could it be the NAR setting?
I have been doing some testing with FLDIGI.
I bought the unit used, and believe I have the 3 crystal filter set installed.
When the node is digital mode it looks like there is a 500 Hz filter centered at 2000 Hz.
Using ISB mode I still get 5 watts out, but it looks like there is 3000 bandwidth.
Any sense of what is going on?
Thanks!
|
I have been doing some testing with FLDIGI.
I bought the unit used, and believe I have the 3 crystal filter set installed.
When the node is digital mode it looks like there is a 500 Hz filter centered at 2000 Hz.
Using ISB mode I still get 5 watts out, but it looks like there is 3000 bandwidth.
Any sense of what is going on?
Thanks!
|
|
|
Tony Murphy
Tobias KK7BCO/2M0TFF
Andy Kerrison
Clyde Lambert
Hb9ica
KM4JHK paul