Quansheng HF Mod Testing

[@jeffs555cc]

The unmodified radio has a 1uh inductor from the antenna input to ground. For VHF/UHF, this has a high impedance so very little signal is shunted to ground. For HF however, the impedance is lower and more signal is shunted to ground. The 1st gen mod comes with a larger inductor(looks like a resistor) which replaces the 1uh inductor to shunt less HF to ground. The 2nd gen doesn't usually come with the larger inductor and if you add the second antenna socket it is not needed. However, if you use the 2nd gen with the single antenna, replacing the 1uh inductor with a larger inductor(470uH?) like in the 1st gen mod should give better sensitivity.

[@m7frs272]

Thanks for the information and thanks for watching 👍

[@ScottReeder-on7kz]

Nice call sigh light bud and nice video as always

[@m7frs272]

Cheers Scott, and thanks again for the callsign light 👍😉

[@gtretroworld]

Excellent comparison video Ben , similar findings myself but i didn’t notice the Gen 2 board was off frequency. Saying that haven’t bothered really listening to anything other than 11m on mine..haha

[@m7frs272]

Cheers Neil! To be honest, it may just be my V2 board that's slightly off. Have a great weekend mate 👍

[@gtretroworld]

@@m7frs272 Unsure I’ll have a great weekend as i am on gardening duties lol, thanks all the same and you have a great weekend too.

[@rrl2849]

I replicated your test except on 14.074mhz 30% AM Modulation and with a TinySA Ultra. The V2 board still had its ears at ~ -120dbm and the V1 board dropped off at about 93dbm. Your results may vary :) I've ordered a few V2.5 boards, we'll see how they work. The last radio I modded has dual antenna's and I've tested that one at -124dbm. The 2nd antenna goes right into the daughter board bypassing the built in amp. I'm not sure if my Tint SA is hot, or what but those are my results.

[@m7frs272]

Thanks for the information & Thanks for watching 👍

[@lmantuano6986]

G'day, vk3ola here, you mention V2.5 boards, is that actually available?

[@acestudioscouk-Ace-G0ACE]

Nicely done Ben. I wonder if the V2 (brown) will be more sensitive when you do the 2nd antenna mod?

[@m7frs272]

Thanks. Yes that will be interested to see. I'll have to do the same test once I've added the external antenna. Thanks for watching 👍

[@richardevans5921]

Great informative content as usual Ben, I bet you ruffle a few feathers using 555 as a demo frequency lol lol. Will be interested in V2 board with the aerial mod, cos from the video 2 seems better.

[@m7frs272]

Thanks as always Richard! Yeah I aim to cater for all my viewers, hams , cb'ers & SWL's lol. Yes it will be interested to see if it improves it at all. 👍

[@hawkinsdaniel7144]

Thanks for this!

[@m7frs272]

Thanks for watching, hope you enjoyed it and it was worth the wait 😉

[@hawkinsdaniel7144]

@@m7frs272 It was, thank you!

[@edwardvanderbosch]

Ben could you do an install of the ver 2.5 board with ipx connector?

[@personalunderstanding7055]

Have you made a video showing how to inject into the HT using the Nano VNA. If not would you made such a video please

[@teslar1]

Looks like the green pcb version is the better mod in this comparison. At least when not installing the second antenna, if It did, that would resolve the sensitivity issue on the brown pcb. So for me it will be the green board mod I think

[@m7frs272]

Yes, despite the lower volume it certainly appears more sensitive. Thanks for watching and glad you found it helpful. 👍

[@Elaba83]

You should have a look into the Fagci Reborn Firmware for this HF modification. And use it on the v1 Board as this firmware doesn't need the Pre-Amp like the v2 board has.

[@m7frs272]

Thanks for the info, I'll certainly try it out. Thanks for watching 👍

[@ugsisr]

Very interesting... Have you seen the New UV-K5 99 ?

[@m7frs272]

Yes, I've got a video coming our soon featuring the UV-K5 (99) Thanks for watching 👍

[@heinerrambold8889]

Guess you can adjust the sensitivity on the second mod version. Thanks Ben!

[@m7frs272]

The firmware is the same for both mods, and I had the settings the same as well. Not really sure if there's anything that can be physically changed on the board. Thanks for watching 👍

[@nikf9702]

My v2 has excellent sensitivity, tested with professional test set generator. Something is wrong with yours. You should try to generate low signal levels, it's not clear with the instrument.

[@m7frs272]

Thanks, yeah I don't think the build quality is all that good on my board. Thanks for watching 👍

[@dons8365]

Which modification are you using on these radios? Egzumer or IJV ? Thx

[@m7frs272]

CEC_0.5HF Thanks for watching 👍

[@chriscollisonmanager5195]

This is a Hardware MOD and custom firmware MOD Sir!

[@petercarter9034]

Excellent post, very interesting, in the orange version did you swap the insides for a UV5R(8) or just change the display ?

[@m7frs272]

​@@petercarter9034 I had to replace the display as I damaged the original one and the one I ordered was orange. Thanks for watching, glad you enjoyed it. The link is here for the display replacement video if you're interested: kzbin.info/www/bejne/oIPXinWlgNmsZ9Usi=dd3u3NSkoX6SWPE9

[@Ni5ei]

I didn't know there's a 5R+ with amber backlight.

[@m7frs272]

There isn't officially! I broke a screen and the replacement was orange 😉 kzbin.info/www/bejne/oIPXinWlgNmsZ9Usi=IYxOqI5oYxoklxaM

[@richardingram3517]

Is this actually the UVK5? I thought UV5R is a baofeng.

[@m7frs272]

For what ever reason, Quansheng also named this model the UV-5R Plus, not to be confused with the original Baofeng UV-5R as you mentioned. Check out this video for more info: kzbin.info/www/bejne/rH2YqpeJo9dsg7ssi=34vF8kYcdWtArS1Q Thanks for watching 👍

[@CodySmiley]

Totally useless mod. I spent 6 hours yesterday installing to receive unclear sound. I don't know what the purpose of this project is.