Replacement battery for YAESU FT-817

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Indeed so, but if you do have protected cells, why bother with the green wire? Why not leave it out, and let the FT-817 charge the battery if it wants to? As soon as one cell reaches the fully charged state, it will stop safely. Thanks Andy, and others for confirming my reading or suggesting alternatives. I was particularly interested if anyone was using a 3 cell LiFePo4 battery, giving 9.9v? Does this set up work reliably with an FT817? With protected 18650 cells, it should be all OK, shouldn’t it? I’ve seen “chargers” for these things that just connect the cell straight across some fairly random voltage (e.g. one cell straight across the output of a nominal 12V supply). They must be pretty robust to survive that.

FT-817ND | Used Amateur Radios | THUNDERPOLE Yaesu FT-817ND | Used Amateur Radios | THUNDERPOLE

can decode (and who decodes you). Or if you wish to send pictures slow scan TV has mobile phone apps that you can use in conjunction with an FT-817/FT-818. No ATU. The FT-817 has no internal ATU. Originally I thought that this was a reasonable design compromise. However, having experienced how hard it is to get small portable antennas to match in the varying environments in which they may be used, I began to realize that an ATU would be very desirable. Most ATUs are the size of the FT-817 or larger, which negates a lot of the benefits of the radio's small size. However, Elecraft has recently introduced a tiny portable QRP auto-ATU, the T1. Read my review of it. you are right - I had blindly assumed that a modern LiPo can be charged at 0.5 - 1 C, but Panasonic seems to play safe and restrict the charge current to 0.9 A according to the datasheet. But still a nice solution, and since it’s based on cells with internal protection, it also looks like a much safer approach than the many RC model LiPo approaches used in the community - the RC batteries typically have no discharge protection and can thus catch fire or explode more easily. temperature compensated crystal oscillator) can greatly improve stability. Both the Yaesu TCXO-9 and aftermarket versions are available. I can't comment on the genuine Yaesu one but even the cheaper version gives a goodMy FT-817 sits quite happily on top of my Maplin 3A power supply and looks as if it was made for it. Unfortunately, the magnetic field from the mains transformer affects the 817's VFO, giving a "dirty" note to signals. The power supply is also twice as high and about 4 times as heavy as the FT-817, making it not something you really want to carry around on trips. I thought I would try to find something smaller and lighter. The good news is that when operating on the 2.5W mode (the default for battery power) the FT-817 appears to deliver the full 2.5W regardless of SWR. I guess this applies to the lower power modes too.

Yaesu FT-817 Battery Replacement FNB-72, FNB-85 - subtel

It seems that LiFePo4 are the better solution nowadays (more charging cycles and more stable) but I own a cheaper LiPo 3 cell 11,1 Volt 2,2Ah and it keeps running all right with me since 3 years now. I can run my 817 during 2 hours full activation without an issue. The design calls for protected 18650s to be used. These have a circuit in them that isolates them if you try to draw current when the cell is discharged to its minimum voltage. i.e. you can’t over discharge them. It also disconnects them if the voltage applied to the cell exceeds 4.2V. With that type of 18650 and the green wire in place, the whole system looks to be fine and dandy. I have 2 of the Zippy LiFePO4 4200mAh and find them pretty good. I get about 5-6 hours out of 1 on my 817 and weigh 480gm each and a decent size (you can fit 3 or 4 lengthways on an 817).preferred as some of the earlier '817s blew their final amplifiers. You can recognise an ND model by its choice of Overall I give Yaesu only 7 out of 10 for this radio, with the comment "could do better." But there's nothing else quite like it on the market at the moment. If you want a very small all mode HF and VHF radio, better get an FT-817! I've had good results from sealed lead acid (cheap but heavy), NiMH and, more recently, LiFePO4 battery types. Note that the latter is quite critical with charging and if you leave it for a while its voltage Hi Colin - I know that - that’s why I questioned whether the cable was there. With my LIPO, I have a simple voltage divider (2 100k resistors) across the output to provide the sense voltage on the green wire to tell the 817 not to allow charging from an external source. The same principal used as when the AA container is installed in the rig. I don’t think the 817 achieves full power on 9.9V Colwyn. ISTR it needs nearer 10.5V. There is some variation between 817s and also it depends on the band in use. That is why the 3S LiPO was so popular, even though the voltage varied from about 12.6v down during operation, there was enough to give full output until the battery was discharged. Other sets are much less forgiving, the 857 likes more volts.

FT-817 Cheat Sheet - RadioManual FT-817 Cheat Sheet - RadioManual

So have you used the 3D Printed, 18650-filled version that is featured at the top of this forum? I did see that I could buy like a windcamp lipo that fits there fine, but I like the idea of using 18650s because I have a pile of them. Summer can turn often dead bands into active segments with massive signals. The cause is sporadic-E propagation, a phenomenon most noted in mid summer, and, to a lesser extent, mid-winter.RX Frequency Coverage: 100 kHz - 56 MHz; 76 - 154 MHz; 420 - 470 MHz. (Exact frequency range may be slightly different) Can I ask if you have considered an internal LIPO rather than external ones? There is a flat 2.5Ah 11v 3S lipo that sits nicely in the battery bay in the FT817 and by my experience will give a good two hours activation on 5W SSB output. TX Frequency Coverage: 160 - 10 Meters, 50 MHz, 144 MHz, 430-450 MHz, plus Alaska Emergency Channel (5167.5 kHz). Bob K6XX identified the problem early and suggests a small changes to the carrier level setting. I made the adjustment as suggested and can confirm it You can add to or update/edit your existing review's content including the Rating and Time Owned with the Edit button on the right side of the review text body. Edits will go thru the review Approval process.