Jleecy,

What model of portable handy ure use bro?Im using ft60r.thinking to get another one as backup.What do u think or comment of icom v85 or yaesu 3r?

I think it’s only a temporary setup otherwise very precarious option to use such DC supply in near proximity to the RF rigs. Switch Mode Power Supply System are notorious for their EMW. Even with proper shielding the performance of the RF rigs is no doubt still severely deteriorated by their close proximity the PSU.

Why would you want to learn such an easy setup anyway?

PC PowerSupply can be used but it is only producing 12 volts. Your rig will need and design around 13.8volts.

You’re not suggesting a design using the PSU as DC-DC Step Up from 12V to 13.8V, right??? Just for the minuscule increment of 1.8V is plain ridiculous to me…we are talking about the 12V input here.

Stick with the regulated Linear DC Supply if you want a design and using it with the RF rigs. Far more cheaper and accessible...minus the "noise" of course.

Thanks for the info bro... i thought mobile rig need 12v only equalvalent to car battery supply...

This post has been edited by Tanakwagu_noh: Dec 29 2008, 05:44 PM

Tana have you taken the RAE test? Move a step up to getting rigs lar.. No need banyak banyak handy..

[quote=NxNSquares,Dec 29 2008, 05:05 PM]
You’re not suggesting a design using the PSU as DC-DC Step Up from 12V to 13.8V, right??? Just for the minuscule increment of 1.8V is plain ridiculous to me…we are talking about the 12V input here.

No I am not, I am saying the normal PC PSU supplies 12Volts at around 8-15amps depending on which PSU you bought from PC shops. In reality all Mobile Radio are designed to work around 13.8volts min 12 amps on full power. One could get away with it when you use a car battery solely because car battery have high amperage. On the average 40-60 AH battery would not be much of a problem.
With 12volt PC PSU when you ram up the TX level to 10 or 25watts you will get extremely bad humming into the rig. With Icom you will even experience a dimming LCD or worse the rig reset itself.

Thats why commercially available power supply for amateur radio are powered at 13.8volts 35-60amp and not based on 12volts. Measure your car voltage when the engine is running is 13.8volts.

So is it concluded that we shall stay at low power tx when using pc psu then it should be okay?

Yes monitoring and TX below 10w would not be a problem. If you google, there are ham operators detailing how to mod the ATX power supply to go 13.8volts but that is way beyond me, some good technical people might attempt to do it but for me I am a chicken when dealing with switching power supplies that have a stored 40,000volts inside.

and here i am thinking of getting a mobile thn if i wana use it as a base, i'd get a psu hmm

i m using the ICOM v85 now...as the others said, since u have already got a handy, why not invest in a rig?

hehe already got icom ic2200 but thinking to get another one unit mobile rig yaesu budget below RM1000k.

anyone wana let go of a trunk mount wif cable? im looking for 1 pm me~!

buy a new one la. Trunk mount with cable not so much la. Compare to ur handy or rigs.

I can understand your quandaries if you expressed it solely from a RA perspective. But beyond that I don’t share the same view as to your reality for all mobile radio to “work around 13.8volts min 12 amps on full power” - any functional radio system can be designed with different power magnitudes in mind. Review back your Faraday’s Laws.



Audible hum at higher power doesn’t mean the cause for humming is absent at lower wattages - we just don’t hear them. And bluntly pointing to the 12V PC PSU as the source of humming into the rig isn’t well called for either. In most cases, humming – and its composite harmonics – is primary caused by bad ground loops between different circuits therefore not properly isolated into a common potential at “ground”.



You have lots of nerve to said that. Not knowing what was going on exactly in terms of proposed 12V PC PSU usage, etc. Foremost, ICOM and others branding would certainly never endorsed such practice.

You have lots of nerve to said that. Not knowing what was going on exactly in terms of proposed 12V PC PSU usage, etc. Foremost, ICOM and others branding would certainly never endorsed such practice.

[/quote]


Why dont you explain instead of barking?

[quote=santacruzer,Dec 30 2008, 08:35 PM]
You have lots of nerve to said that. Not knowing what was going on exactly in terms of proposed 12V PC PSU usage, etc. Foremost, ICOM and others branding would certainly never endorsed such practice.

[/quote]
Why dont you explain instead of barking?

[/quote]
Who's still barking for explanation now despite the known fact?

rilek rilek...

jangan gaduh2 geng...

lets be nice k...

if there is anything anyone don't agree with, please feel free to enlighten everyone else in this thread, explain it, or teach us....

i think it is safe to say that nobody can claim they know everything in this world right, unless he is God himself, so please teach those who may don't know bout it

chill guys...

hmmm u sure can get a lot with RM1000k