Power supply...

[W7XF]

So you're saying a car battery would power the radio, and the 1.75a power supply would recharge the battery?

Yes, it will. Just remember to turn off the PS before you play radio. 1.75A should keep the battery in fine shape if turned on before you go to your slave labour.
Best bet would be a deep cycle battery (marine or RV battery) which you can easily buy at Ghetto-Mart, O'Reilly's or AutoZone.

[kb2vxa]

They call me Mellow Yellow, quite rightly. But why turn off the power supply... at all? Mine ran 24/7/365 and trickle charged the battery, remember, any current in excess of what is supplied by the PSU comes from the battery. The bottom line is the supply will only put out so much, current is limited by resistance of the transformer secondary winding, battery output is limited by the resistance of the battery, considerably less. Being a trickle charger there's virtually no chance overcharging the battery, as terminal voltage rises charging current drops until it's down to a few milliamps. Eh, I used a car battery since I never deep cycled it, no need to spend so much money when the local junk yard is full of old car batteries. Lemme tell you something, the junkies down by Rahway (NJ) Prison were Ghetto Mart before Walton built his empire. Auto Zoned, what happens automatically when your stash falls in the campfire. (Cue Rocky Mountain High; John Denver.)

Yup, that's my honey hole, a treasure trove of used car parts for rock bottom prices, just bring your tool box. Before that a gold mine for tube type car radios great for BCB DXing back in the day. Now radios and the band suck, oh well.

[wa6mhz]

A Deep Cycle battery, when even slightly discharged, is going to draw more than 1.75 in recharge. High current will stress that pass transistor in the PS, which may endanger it. I SURE wouldn't have the radio even connected in an OFF state when trying that (Some circuits are still energized when the radio is off, thus they are vulnerable to Overvoltage)

I am really worried that the pass transistor on that PS is going to SHORT. Then it will be GAME OVER! Please don't have the radio anywhere NEAR that battery when U try and charge it with that PS. And monitor the battery with a voltmeter when U do.
73

[K9CCH]

I'm not doing anything with a battery. Or that power supply.

[N8YX]

That power supply is good for use as a memory backup power source for rigs or other equipment which requires external keep-alive voltage...or to run a TNC or similar low-draw shack accessories. I used one of those for years as a power source for a remote-controlled antenna polarity switch.

If you're worried about overcurrent conditions, install some form of passive (fuse) or active current limiting circuitry in series with the output of its pass transistor.

The ideal multi-multi shack power supply would consist of a 14v, 5000+ AH combination of deep-cycle and float-type batteries which are charged via at least two disparate methods (wind/solar, wind/mains, etc) through a charge controller-regulator-distribution bus arrangement. This takes a lot of space but you make up for it with greatly reduced EMI/QRN near-field levels. Of course, most of us are stuck using a mains-driven DC supply due to these constraints but if you have enough room for a bank of 4-8 100AH deep cycle batteries you can connect them to a supply through a charge controller (such as the unit offered by West Mountain Radio) and have yourself a nice little auto-failover DC setup.

[K9CCH]

That power supply is good for use as a memory backup power source for rigs or other equipment which requires external keep-alive voltage...or to run a TNC or similar low-draw shack accessories. I used one of those for years as a power source for a remote-controlled antenna polarity switch.

If you're worried about overcurrent conditions, install some form of passive (fuse) or active current limiting circuitry in series with the output of its pass transistor.

The ideal multi-multi shack power supply would consist of a 14v, 5000+ AH combination of deep-cycle and float-type batteries which are charged via at least two disparate methods (wind/solar, wind/mains, etc) through a charge controller-regulator-distribution bus arrangement. This takes a lot of space but you make up for it with greatly reduced EMI/QRN near-field levels. Of course, most of us are stuck using a mains-driven DC supply due to these constraints but if you have enough room for a bank of 4-8 100AH deep cycle batteries you can connect them to a supply through a charge controller (such as the unit offered by West Mountain Radio) and have yourself a nice little auto-failover DC setup.

I ran this through google translate, and I still dont understand a word you said....

[W7XF]

مرحبا.
يمكنني استخدام مترجم جوجل، أيضا.
أطير طائرة هليكوبتر الوردي بيل 47 مع وحدة الطاقة المساعدة.
وأنا لا تزال تريد تاكو!:-P

[K9CCH]

I got your taco....

[W7XF]

I got your taco....

Oh, you do??

[K9CCH]

Yeah. Her name is Shirley and she likes it rough.