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7 votes

Are there any cons of running shack on battery?

I don't mean to talk you out of the idea, but I suspect the advantages are not nearly so great as you imagine. Cheaper than a dedicated RF-grade power supply (USD30 for 40 Ah car battery) I don't ...
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6 votes

Coax braid acting as power supply ground between radio and amplifier connected to the same supply, is this a problem?

If I understand the description correctly: simulate this circuit – Schematic created using CircuitLab If that's all it is, I wouldn't say it's any big deal. Whenever you have multiple paths to ...
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6 votes

What advantages does SLA have over a Lithium chemistry battery for a Go Box?

SLA cells are dead easy to recharge, improvising a charger may be as easy as a set of jumper cables. Lithium ion's require active charging circuitry and the failure mode can be catastrophic. That ...
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5 votes
Accepted

Does scanning take much more battery than listening on one channel?

There are a few states of listening that you should think about: listening with the squelch closed, the receiver is probably off for 95% of the time, turned on a couple of times a second to check for ...
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  • 7,817
5 votes
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What is the socket for on this Baofeng BL-5L battery?

That's for charging a 3800mAh battery using the side jack. To charge the BL-5L 3800mAh battery you must purchase a: - TYT TH-UVF9 battery charger for 110VAC or - TYT TH-UVF9D for 12VDC. These are ...
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5 votes
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How to figure out my car battery's capacity?

There are many ways to do this. My favorite and I would assume you have these items in your shack. Most inverters have an automatic low-voltage disconnect feature. It makes a beeping sound and stops ...
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  • 216
5 votes

Are there any cons of running shack on battery?

Possibly an issue with your HF CB rig is that the output power will be lower at 12.1 than at 13.8 or 14.0 volts. I've seen on 100 watt ham rigs that the final amplifier runs directly from the DC ...
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  • 7,817
4 votes
Accepted

How can I replace the NiMH battery in an old RigExpert AA230 Antenna Analyzer?

With the battery case detached from the device, look at the side with the copper terminals. You should see several seams that can be exploited with a sufficiently thin shim. I carefully used a box ...
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  • 1,445
4 votes

Coax braid acting as power supply ground between radio and amplifier connected to the same supply, is this a problem?

An anecdote: I had problems with my station which included computer-radio interconnections; some of my devices (RTL-SDRs) would lock up when I powered on my Yaesu FT-897. I eventually tracked this ...
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  • 22.9k
4 votes

Are there any cons of running shack on battery?

In addition to the points raised in the other fine answers, I'd like to add a few: A good three-stage battery charger for lead-acid batteries may cost more than a power supply. Many chargers make ...
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  • 8,922
4 votes
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Deep-cycle marine battery life question

When you parallel batteries, the combined reliability generally becomes less than the least reliable battery. In reliability engineering, this follows the equation: $$R_S=R_1*R_2*R_3 \tag 1$$ where $...
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  • 18.1k
4 votes
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Yaesu FT-60 Battery Life

The FT-60 manual says the battery pack is a NiMH pack ("FNB-83 (7.2 V, 1400 mAh)"); so, as we usually use 1.2V as the nominal voltage of a single NiMH cell, a pack of 6 cells in series. You'd usually ...
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4 votes

Power supply for shortwave portables

I wouldn't risk directly connecting a 9.6v battery to a radio that expects 5-6v. The simplest solution would probably be the diodes mentioned in the comment to your question, but as the battery ...
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  • 716
4 votes
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Storage of a Baofeng UV-5R

Battery University has some general information on storing batteries. Relevant points: Storing a Li-ion battery in a discharged state will permanently damage it Storing a Li-ion battery at 100% ...
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4 votes

Can I use new 14500 batteries instead of AA with Yaesu VX-8DR?

The email from Yaesu's tech support was probably talking about non-rechargeable 1.5 V lithium (not lithium-ion) AA batteries, rather than rechargeable lithium-ion batteries with a nominal voltage of 3....
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  • 8,922
3 votes

How do I replace the Li-ion battery in a Kenwood TM-741A?

I found the TM-741A service manual. As shown on page 106, the battery can be seen looking into the case from the front after the display panel is removed. Luckily, the spare batteries from my dive ...
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  • 7,685
3 votes

What is the socket for on this Baofeng BL-5L battery?

Check point no 6.7 on this page - http://www.miklor.com/uv5r/UV5R-FAQ.php#Batteries It talks about an extended battery like you have shown here. Also says that it uses a side jack. The port you see ...
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2 votes
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Will I harm batteries by only trickle charging them, or connecting them to a power supply?

You're not getting answers for multiple reasons. 1) Batteries are a science but its surrounded by marketing and astrological tradition (concrete floors, blah blah) 2) If something bad happens they ...
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2 votes

Storage of a Baofeng UV-5R

It should be fine as long as you don't have it plugged in. If you have it plugged in it makes a lot of noise and it is hard to listen to.
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  • 75
2 votes

How can I counter DC-DC inverter noise / ground noise in an electric-vehicle mobile setup?

Allow me to refer you to Alan Applegate K0BG's excellent page about mobile radio wiring and grounding. That page recommends that you power the radio with a fused negative lead connected to the ...
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  • 8,922
2 votes

Baofeng UV82-HX charger problem

Try reducing the power and see if that helps. If it lets you transmit longer then the battery needs to be replaced. If it shuts off right away at low power then you may have a bad final or other ...
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2 votes

Deep-cycle marine battery life question

I'll bet those old batteries are just plain worthless. Based on our experience with many deep-cycle golf cart and automotive batteries, those 10- and 20-year-old batteries almost certainly are not ...
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  • 7,495
2 votes

FD Battery Stations... How Do You Log?

You can get an inverter that will run a 35W, or even a 65W 120V laptop charger from a 12V source for around $25 at any auto parts store. That won't get you internet, but it will get you all-day ...
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  • 3,881
2 votes

Does scanning take much more battery than listening on one channel?

I would not be surprised if the audio amp used more power than the rf front, tuner osc, and signal detect combined. Thus listening at some reasonable speaker volume, and using energy to vibrate a ...
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  • 12.4k
2 votes

Can I use new 14500 batteries instead of AA with Yaesu VX-8DR?

This would very much depend on how the device is wired internally. Is it possible that this will work? Yes. Is it possible that you can destroy your device? Yes. The current that can be delivered ...
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  • 789
2 votes

How to figure out my car battery's capacity?

Is there a good way to find out [a battery's] real remaining capacity except draining it by a known current and measuring time? While I'm curious to this myself and would love to see other answers, ...
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2 votes

Are there any cons of running shack on battery?

Add portable. You aren't stuck operating where there's an AC outlet. That's why most POTA and SOTA operators run off batteries, even when carrying solar panels or in an RV. Also possible ground ...
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  • 12.4k
1 vote

Can I use new 14500 batteries instead of AA with Yaesu VX-8DR?

The answer to this is likely no. Even the internal lithium battery pack maxes out at 8.4v.
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  • 4,203
1 vote

Coax braid acting as power supply ground between radio and amplifier connected to the same supply, is this a problem?

Should a 'a not so good contact' at the HT's external jack/plug be ruled out as a contributory factor, the only way to avoid DC current in the coax braid would be to have a separate battery pack for ...
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  • 727
1 vote

FD Battery Stations... How Do You Log?

I built a voltage booster using a LT1270A for this purpose: https://www.qsl.net/ve3lny/booster.html
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