nrg kits 4w kit, parasitic oscillation at 93 - 94mhz

[nrgkits.nz]

Is anyone who has an original pll pro iii 4w kitform they built up or obtained from somewhere able to test the power out at 93 and 94 mhz, or preferably look at the output on a spec-an if possible and see if theres a powerdrop and multiple spurs at said freqs. Note this is with kitform boards only, they contain a 4427 for the driver. The boxed units had a different driver and different matching to go with it. The boxed units ive tested dont exhibit this problem, however the kit boards with 4427 drivers do. Note this is with the 4w version only, not the 1w version. The 1w version still uses a 4427 but has different matching again and is clean at said freqs. From testing, the problem can be solved by replacing the bf199 transistor pairs with mpsh10's. Note the HFE also has to be matched to within +/-1. Im interested to see if anyone has noticed this?

[MiXiN]

I recall that some guy on one of the other forums built one of them recently and noticed a drop in power at about 93 Mhz, but I can't remember where I've seen the post now.

[sinus trouble]

Hello NRG.Nz
ive never noticed this problem? I have the original 'Steve Moss' 1watt and 4watt version!
The PCB itself looks identical apart from a few changes in the output section?
Im sure that NRG would have spotted a problem like this during testing?
I dont believe the problem is with the oscilator section? because of the nature of how it works!
And the 2N4427 is used in both configurations! It runs at a very small output (150mw approx)
The output transistor of the 1watt version is the 2N3553!
and the 4watt uses a 2SC1947!
if you have the PCB layout and components correct? you should have no problems?

[teckniqs]

Sounds to me like cheap Chinese devices may be the cause...? ?

[nrgkits.nz]

Sounds to me like cheap Chinese devices may be the cause...? ?

Not cheap Chinese devices, they are from Christine. Anyway the problem is solved by substituting the BF199's for MPSH10's.

[teckniqs]

Cheap BF199 devices from China via Christine.

[sinus trouble]

LOL You couldnt be more right Mr Teck!!
NRG used original motorola transistors!! CENs are ok? but still dont compare!! Parasitic spurs are a sign of a F*ckup!!! back to to the drawing board bruvs!!!

[sinus trouble]

Sounds to me like cheap Chinese devices may be the cause...? ?

Not cheap Chinese devices, they are from Christine. Anyway the problem is solved by substituting the BF199's for MPSH10's.

Why are you changing the oscillator section?? with the right transistors it produces 50mw easily on all frequencies???

[MiXiN]

Knew I'd seen a post about this somewhere.

There's a guy here who has had the exact same problem with one of the New Zealand pro IV kits http://radio-anoraks.com/forum/viewtopi ... 0&start=60

[hereclit]

Hi , I think that the problem is L2, it's critical.
@Sinus Trouble can you tell us information about L2 . Have you "Steve Moss" genuine L2 on pcb ?
regards

[shorty]

L2 on the original nrg boards was 6 turns of ecw wound on a small former with a drop of superglue, the former was the sheath stripped from 2.5mm twin&earth cable.

[nrgkits.nz]

Knew I'd seen a post about this somewhere.

There's a guy here who has had the exact same problem with one of the New Zealand pro IV kits http://radio-anoraks.com/forum/viewtopi ... 0&start=60

This guy used copied pro4 boards not from me.

[nrgkits.nz]

L2 was wound on a piece of hollow insulation stripped off mains wire used to connect up power supplies in the boxed units. The kits with 4427 had 6 turns and the boxed units with different driver/matching had 8 turns.

[hereclit]

This topic is very interesting. I have 5W between 93-94 Mhz. Not bad ! I used CEN 2N4427 transistor and genuine 2SC1947.

[fmraider]

Cheap Chinese Copies - now where have we heard that before.

Love it !!

Now we know Christine has ripped off N.Z as well, or did Christine tell Gareth which factory to visit on his trip to China ??

[MiXiN]

If you go to page 8 on that anorak forum that Zeroex guy mentions that his genuine original pro III also had a power drop, so it looks like the kanga guy who I think it was from and New Zealand guy are both using cheap Chinese parts were some OEM parts should be used.

Looks like Christine has taken them both for a ride.

There is no other explanation especially since the original pro III has been out for years and tested by many and this problem is only just showing.

[fmraider]

I have always said Christine ripped off Kanga in actual fact she still owes Kanga a load of gear. Then sold it to Gareth - Very Naughty.

Kanga does not come on here anymore as he was fed up with the lies and comments he got from Albert and Christine, although she did not say it was herself that was making the comments. So maybe Kanga was saved from the nasty stuff which is now in NZ kits .

Regards to Kanga's components unless he has been sold duff from major suppliers then all should be genuine components and if proved otherwise will exchange the offending item. Kanga Has always held his customer service in high regards so if somebody has purchased a kit from him and was not happy they should have made a comment or complaint at the time not 6 months down the line.

Regards to Zeroex Guy if he bought a Pll 3 from him it would have been a Part Kit as Kanga only sold Part Kits and PCB's only. Unless it was 1 watt Mono/Stereo. Just spoke to him and he is checking who bought PLL 3 Part Kits.

But at the end of the day, this comment was just made for these situations - I TOLD YOU SO !!

[MiXiN]

One of that zeroex guys comments on the other forum looks like he's sticking up for Kanga saying he thinks the kanga parts are original, but I see others saying they might not be in reply to the problem.

Who knows, it could be Kanga or Joe next door, it's all so confusing, and the Chinese are great at making things look original?

[fmraider]

I have just spoken to the guy at Kanga and his reply was:

"If the guy who has purchased a Kit or Part Kit from Kanga contacts him, he will sort out with him the defective part"

He has also explained all parts contained within his kits either NRG or otherwise are all bought from genuine suppliers. If it is proved that a part supplied is duff etc. He will take it up with up with the supplier.

[andrew_kits]

Please use genuine semiconductors , otherwise you will have problems.
BF199 and Bf245c from Fairchild
2N4427 - Motorola or CEN
2sc1947 from Mitsubishi (I found a suplier in Germany)

Cheers and Happy broadcasting !