Customer repair - Wolfy's Ham Jumbo

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Customer repair - Wolfy's Ham Jumbo

[@kenwood8665]

Another fantastic video

[@MicroChipz]

Glad you enjoyed it

[@RafaKowalskiego]

Jestem zachwycony twoją pracą, szacunek za wykonaną pracę,

[@MicroChipz]

Dziękuję bardzo

[@RafaKowalskiego]

Czy zmodyfikujesz mojego concorda 2

[@MicroChipz]

Hi , its going to cost too much money to send it from Poland.

[@RafaKowalskiego]

Nie dbam o pieniądze,mieszkam w UK

[@RafaKowalskiego]

Koszty nie są dla mnie przeszkodą

[@andyward7272]

It’s had a regulator change on the psu The old way of doing the FM audio as described in the midnight express which did work quite well back in the day The eprom is a spectrum one I’d of bolted that to the chassis and never understood why they cut all the tracks when the selector is off the main board and runs back on wires You’d only need to cut one track then Much neater with the microchipz boards installed Great work as always

[@MicroChipz]

Thanks Andy , i presume thats a 2n3055 in the psu, i did think it was a replacement, its a good jumbo now :)

[@michaelmilenkoclewes572]

Been to see wolfy tonight he cant wait get it back ...to be honest im quite exited to try it out at his

[@MicroChipz]

Nice :)

[@Alan-Dawson]

Had one of these early 90's was a great set. Lots of banks of 40 channels, alphas and I had an ES 880 echo chamber sitting on the top of it. Don't think It had the modulation mod done so was low base sounding but the tinniness of the chamber balanced it out. Everyone said It sounded great....happy times! oh and mine had handles on the front??

[@MicroChipz]

Coincidence I have a 880 on top of mine .

[@Alan-Dawson]

@@MicroChipz favourite rig? I was a big fan of Ham International the Concorde 2 was my fave for mobile but I did have thing for Hygain V ...Never owned a Uniden thought they were deaf, Have a Fidelity 1000 somewhere, used that as a heated foot-stool. Great vids mate 🙌

[@MicroChipz]

Thanks. I do like the cybernet bases radios , always had a thing for the jumbo or the marko excalibur mk2. i have concordes and mm2's. i am liking the mm2 more these days , they are a cracking radio when setup right .

[@gtretroworld]

The use of Blu Tack in a radio was a first for me and looking at the pad size I’m surprised it fell off!😂Out of interest where did you source those bulbs?.Ace video as usual.👍

[@MicroChipz]

The LED's are from eBay. search for filament led or COB led 3v.

[@gtretroworld]

@@MicroChipz It was more the 12v Grain bulbs that i was interested in.

[@MicroChipz]

www.ebay.co.uk/itm/134470418787?var=433941550248 ebay again

[@gtretroworld]

@@MicroChipz Cheers Buddy you’re a star👍

[@Alessioalessio-qv1ff]

So what was that eeprom for? And was was programmed inside and where was it connected to ?

[@MicroChipz]

It’s for giving the uk40 readout it just changes the pll codes , it sits in between the channel change and pll , and would have to programmed in a special programmer.

[@carlb6939]

Hi - the jumbo are good radios when set up correctly- I have a mk1 that’s had the fm audio mod done ,only issue is with a power mic it’s wide as a barn door Any idea how to solve that issue Carl

[@MicroChipz]

I suppose alter the dev to suit a power mic . I find they work just nice with the standard mic.

[@carlb6939]

@@MicroChipz Thanks for the reply - will give that a go which one is the fm Dev adjustment vr?

[@MicroChipz]

@@carlb6939 rv3 near the front of the board is fm dev

[@M0XFXUK]

I don't understand why people think that playing with the slug in the VCO block will improve things as the PLL circuit in these rigs are pretty poor at best and it is already tuned for best performance at the factory. I really do think that trying to get more bandwidth from this PLL stage is like trying to get blood out of a stone. Just Saying🤔

[@MicroChipz]

A expanded VCO squeezes a little more out of the circuit, its the RX and TX stages that let it down after that.

[@M0XFXUK]

@@MicroChipz I'm currently playing with the SI5351A which is producing a cleaner waveform in a COX board with out the need for the PLL, VCO or band crystals but I can't modulate FM TX. But I'm working on the FM problem and think I may have cracked it.

[@MicroChipz]

Shouldn't be too hard to modulate the FM signal i think ? Keep us posted on your findings. You are more than welcome to share your project in my Facebook group if you have that social media.