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@@danishnative9555 Hi Paul, expensive you say? I think not. When I was looking around for an E bike the cheapest from any shop round here was £2000! This one cost £750. Big risk buying it on Amazon without being able to try it, but I've been quite happy with it overall. Not sure about the display issue, its been out in fairly hot weather and the coldest was probably around 32 F! Don't know why the new ones blue but hey at least I got it working. I worked out it costs me about half a pence a mile to run, so it's probably paid for itself in the unused diesel I would have used in the car. I would think its great riding territory out in UT, but yes the extreme temperatures would be off-putting. 73 Nick

@@ptronix Big diff tween' exchange rate USD vs. Britain pound. Happy travails, and protect your noggin' always. (Esp when imbibing) Cheers.

@@matambale thanks for your encouragement Joe, just watched it on my TV and its not as bad as I feared. 73

@@tristancan yes I love it! It makes cycling up hills a pleasure. And as you know there's a hell of a lot of them round here. Of course I know Minch well, lovely place to live. Best wishes Nick

@@LouWild-kn4zi after nearly 3000 miles mechanically it's still fine, but I've got issues now with the display turning off randomly although this doesn't seem to affect the operation of the bike! I'm plucking up the courage when it finally fails to install a new display. I'd say that price sounds good. Fair bit cheaper than what I paid.

@@ptronix thanks for the reply.

What do you expect from me, I'm virtually illiterate and getting worse the further I get from being at school!

@@ptronix I have been out of school since 1978 and I’m not using that excuse?😳

It actually says duplexer on it, so put that in your pipe and smoke it!

@@ptronix So if your car says elephant on it, do you feed it ot put gas inn it?

If I knew what I know now when I built this 35 years ago I wouldn't put the transformer so near to the boards. I've got the noise level down significantly and the owner seems happy with it. Thanks for the comment

No, my impression is as its quite old now it would be difficult to find anyone who's actually has knowledge of these radios now. But a good suggestion none the less

The staff are very knowledgeable re the 8500

@@raybokor2 thanks I'll bare that in mind. Its faulty again now. Randomly makes a rude noise, flashes the display and burning smell. Traced it to a 5 volt rail going short and causing the resistors before the regulator to overheat. I've measured as low as 0.6 ohms on that rail with respect to earth. But this is such a random event its driving me nuts trying to find the cause! It will work fine for a few days then suddenly dies. If it went permanently faulty of course it would be easier to fix

That's rather odd behaviour. I've never noticed any of the ones I have do that. Quite an achievement to get within 100 Hz. Maybe you have too much capacitance and that's upsetting the chip? Did it behave like that before you did the mod? On the ones I worked on I thought to get it within 1 kHz was more than good enough on the wide bandwidth of stereo FM. Most of the ones I've used are not transmitting stereo, they're used to relay various pieces of ham radio gear. In that case there's often a link on the board to set to mono. Thanks for the comment

@@ptronix Yes, it did not transmit stereo on initial power up before I added the xtal load caps. I thought maybe the center frequency was too far off for the tuner to lock in the stereo pilot signal. I also tried jumping out the mono link momentarily after power up to see if that forced it into stereo, but that didn't work. I only had 15 pf surface mount caps, so getting the frequency so close was just luck.

@@ptronix Hello again. After some more experimenting with the FM TX module from Amazon, I found that I can force stereo mode on power up by placing a 330 MF capacitor across the MONO jumper pads located on the PCB. This causes the jumper pads to be "shorted" until the capacitor becomes charged a few seconds after power is applied. I also discovered that simply plugging a 3.5mm plug into the audio in jack will force stereo mode on a module that's already powered. However, leaving the plug in place during power up does not force stereo mode. This module has a small microphone onboard and I think the firmware forces MONO mode unless something changes after power is applied. That makes sense since the mic is monophonic. Changing the transmit frequency or plugging something into the audio in jack are 2 things that work to force STEREO mode after power is applied.

@@ctbcubed ah yes now I remember, when I used one in a DAB radio that I wanted to listen to on an FM tuner, I removed the jack socket and hard wired it. I found I had to link a couple of the pads where the socket was connected to make it transmitt in stereo. But it always did after that. So that doesn't explain why yours doesn't. But at the end of the day I've been quite impressed with the audio quality, just a shame about all the spurious crap it produces through the FM band.

Hi, I've completely forgotten what happened in that video, I'll have to rewatch some time. Glad it helped you anyway

Maybe so but a bit big, mine are made to measure

@@ptronix They are that. I know how much work goes into these filters

It's a nice idea, but one problem I don't know what they do! Other than the fact that they are involved in the matching process to 50 ohm. I understand simple antenna theory like how a J pole works as an end fed half wave and how you match it. But this is somewhat more complicated especially as its a two band antenna. Also I don't want to take it down and apart again. Its been happily working for several years now and that's where it will stay unless it went faulty. Thanks for watching.

Glad the video helped you, always remember to let the thing temperature stabilise when adjusting bias. It will drift up and down so may need readjustment several times. Better to blow fuses than the output transistors! Thanks for watching

This is an old video now Joe. Although the symptoms are much the same with flashing display etc. But then it wasn't cooking the regulator and of course it fixed itself for two and a half years!

@@ptronix I saw the date on it and wondered exactly that, if the regulator issue occurred back then, too Guess not. Rig is possessed.

Hi there, glad you found it useful. The only handheld radios I have are the various Chinese ones and to be fair to them they're all fairly good for the cheap price. If you want something significantly better I'd be looking at either Icom or Yeasu but at a much higher cost. Thanks for watching

As you can understand, its impossible to diagnose a fault at a distance. If it was in front of me I could tell you. Could be many things. Check the fuses. But if they're blown they've probably blown for a reason

@ptronix I checked and the fuses are OK. I was surprised to see this happened out of a sudden.. yesterday was working fine and today when I turn on the unit... no power🤡

Shame they can't fix the display issue that radiates RF noise

Can't really help you with that problem. Difficult to diagnose at a distance. My advice is contact Hyuhome, they're very good at responding to enquiries

The button in the battery is just to show the charge level. To turn the actual bike on you press and home the MODE (M) button on the controls that are on the handlebars

Thanks for the kind words. I'd do more radio testing if I had more radios to test. My channel is to small to attract companies to send me stuff.

Yes they work well, good audio quality as well. But watch out for the spurious signals they put out across the FM band.

​​@@ptronixI developed a coil less 100mW amplifier for this module using 2N3904/3906 transistors but the spurious signals from this module extend well beyond 108MHz. The module gives me the highest power output on 92.7MHz (6.5mW). Measured with a 50ohm dummy load and 1N4148 and 100n connected to it to read the peak voltage and it's 0.28V + 0.5V diode loss squared / 100 = 6mW approx. My coil less amp boosts it to 110mW but the dirty signal is not suitable for amplification.

@@dare-er7sw thanks for your comment. The signal purity on these is so poor I wouldn't dare stick an amplifier on it. The only way would be to filter it severely. All the ones I've used have a peak output at 108 Mhz of around +7 dbm and around +3 dbm at 88 Mhz, regards Nick

@@ptronix What's your email? I would like to send you the schematic of my three transistor amplifier.

@@dare-er7sw email is ptronix1@gmail.com

No bugs in this one. Maybe you have an earlier one? Except of course for the colour display which radiates noise degrading the receiver performance. But I've fixed that as I show in the next video. I suspect the H3 will have the same issue.

Thanks for your comment. That's praise indeed! Not many say they love my videos. Like them maybe. If you build a filter for 446 Mhz obviously you will need a lot less turns on the coils and smaller capacitors. Hope you have a spectrum analyzer and tracking generator to adjust it, or maybe use a nano vna? Wow you certainly got some good stuff, that's a once in a lifetime event. I used to work for the government doing electronics so had access to the best test equipment and components. My bosses didn't mind me doing my own projects as it was a sign of having an interest in learning, as long as I got my work done on time. That's where I learned most of what I know now. We don't see a lot of Russian equipment over here and it's sad the way things are now between Russia and the west. Bloody politicians to blame as usual. Thanks for offer of equipment, but I think it would be difficult to get it here at the moment and also probably expensive. Best regards Nick

A lot of radio for not a lot of money. Very decent transmitter, shame about the receiver. Used to use the acoustic sig gen for opening repeaters in the days of 1750 Hz tone busts. thanks for watching Joe

I'd thought along the same lines, but what's the conductivity over its surface? Needs to be low resistance for maximum shielding and how would you connect an earth to it?

I'm pretty sure that's called kapton tape and it's pretty nonconductive to say the least. You pretty much need some sort of micro mesh like used in vfd displays maybe 🤔

But it's not an LCD display. Its colour LED which I suspect needs a higher drive level. Typically this will be some sort of square wave, maybe in the 10s of kHz. And as we all know square waves have harmonics up to VHF in this case. Its definitely radiating off the front of the display. I can hold a spectrum analyzer probe near it and see the noise level increase by 20 db on 145 Mhz. If you put a different antenna on the radio that's not near it of course this problem goes away.

​@@ptronix Absolutely correct my friend! Radiating from the front obviously! I was originally thinking along the lines of fjs1111 but that would only be correct if it was a fluorescent backlit LCD. Even the Baofeng, QUANSHENG, etc. radios have LCD displays backlit by LED with no interference issues at all. Including full color LCD displays like on my Baofeng 5RM! Much better engineered radios than tidradio obviously. What a fail tidradio and I almost considered buying one of their radios recently! Sure glad I came across your other video first (watched it till the end 😉) before buying such a flawed designed tidradio 🙄 oye 🤦🏻‍♂️

Thanks, not the best solution, looking for a better one someday

​@@ptronix Pretty sure that's the best and only solution! Just need to find some micro mesh 👍

As we all know Paul a pretty colour display makes everything work better. Or go this case worse! give me an LCD anytime. At least I got a free radio out of it.

@@ptronix I agree. Let's be practical and apply some Sense and Sensibility to the unit under test.

Sarcastically minor detail 😅 Devil's in the details as the saying goes. Makes a minor detail a BIG deal!

Too true Timothy, surely they noticed this problem before I informed them. I've being trying to find 'EMI' shielding on ebay but it's either not suitable or too expensive. But I hope I can find a better solution one day.

Well said 👍

Must be joking Bob, can hardly see it let alone paint it! And Yes it would make it thicker and obscure the display more. I'm not entirely happy with what I've done and will continue to look for a better solution. Thanks for watching

Thanks dave. I will send a link to the video to my friends in China, but as I said I don't expect they'll do anything to fix the radio.

Thanks Joe for watching, my No1 fan! One day you're getting bored with my videos. I will send a link to this video to my friends in China, but I don't expect they will do anything to fix this problem. I was going to measure a hair to see if it was thinner than the wire. It did drive me nuts, as it beaks so easily. Best wishes Nick

Thanks, not entirely happy with this fix, but its the best I can do at the moment.

Hope it works well for you. Must admit I still prefer 'chirp' for programming radios

At least I got it for free! If I'd bought it with that problem I'd be demanding a refund! Its not an Lcd display its LED and herein lies the problem. They obviously need more drive current for the multiplexing. And that is causing the noise. There is absolutely no advantage in this display apart from looking pretty. Their technical department says thats normal with that display but it's certainly not acceptable! I'm working on a fix, some sort of screening to stop it radiating. Its on operating table at the moment. But there's so little space in there it's touch and go whether the patient will survive. Thanks for watching

@@ptronix Yeah still a cool little radio for a freebie 👍 interesting that it's an all out LED display 🤔 good to know. A regular lcd dot matrix display with a little led backlight would have looked just fine and way more functional especially in sunlight. Well, if you can work out some sort of shielding for the display... that's definitely worth another video... 😀

​@@ptronix BTW- just thought of this! Maybe you should take the part of this video about the display and post a separate video about that on RUclips. You'll probably get a million views! This may also affect the td-h3 or any other td models that share this display. Just an idea 💡

@@Alchemist39 no chance of me getting a million views! My most popular video has about 40 K. I'm one step ahead of you there, I've been videoing the progress on this fix. I've finished modifying the radio and it's a massive success but a fairly ugly one! Not sure when the video will be uploaded, maybe latter

Thanks for such a positive comment. I've had so many negative ones on this video and I don't understand why. All I'm trying to do is inform and educate people. But it won't put me off doing more videos. Best regards Nick

@@ptronix Welcome! Glad I found your channel and thanks for taking the time to reply. Some people are just plain mean on RUclips because they have nothing better to do 🙄 I just ignore them and delete their stupid comments. Anyway, I can tell you have a lot of experience and knowledge with electronics in general. I just subscribed and plan to watch and share more of your videos! Keep it up 👍 -David

Thanks Rog, I hope to do a follow up video fixing the display noise. Had an email from the company saying this it normal in a colour display! In other words they aren't going to fix it! 73

Don't know what they were doing, shouldn't have got through the R & D with this problem. I've told them and sent them a short video showing the problem. They've not responded with anything useful. This display noise makes the radio virtually useless to me. But I'm working on a way to cure the problem. Some sort of screening over the display. But that will probably make it less visible. All this nonsense for having a colour display, which means nothing to me. Thanks for watching. Best wishes nick

Needs to be wrapped up in tin foil Joe that would sort it! But then of course wouldn't be able to see the display!

F the law who's going to know? If you see police you just pedal. They're not going to pull you over an inspect it unless your flying around on it at stupid speeds