Mobile Amp

[w6pea]

Okay
Here goes I want to get an amp to run behind my IC-706-MKIIG, I am using a Side kick antenna. Works good but people say I have a low signal.

I was thinking about getting an Mobile Amp but don't know which one to use.
Thanks
Pat w6pea

[Richard Stouffer]

A friend with a 706 MII has been experimenting with two difference tuners for mobile operation into to a Hi-Q antenna. He tried the Ameritron 500, buy it doesn't fine tune well. He switched to the LDG 1000PRO and seems to have pretty good luck with it. If you're not famaliar with it, the Hi-Q has a remotely tunable coil.

[w6pea]

Thanks Rich.

I had experience with Hi-Q Antenna's. They are pieces of JUNK as far as I am concerned. I wouldn't wish one of them on Osama Bin Laudin

I have the High Sierra sidekick. And am very pleased with it.
73 w6pea

P.S. When I bought my Hi-Q I was only a Tech. I complained to Charlie about the antenna and the install he did. He said because I was only a Tech I did not deserve to own one of his creations as he put it. bottom line I gave it the old heave ho. I gave it to a friend and he could never get it to work either. and he was an Extra at the time he's now SK N6ALA was his call.

[w7wv]

I ran HF mobile for a time with IC-706 series radios and High Sierra screwdrivers. I never had a problem but we were not at the bottom of the solar cycle at the time either.
I had both the 1500 and 1800 series of antennas and have not personally used the SideKick.
Are you running this rig in an RV? If so I would think DC power requirements are going to be a concern. Even a smaller amp will draw lots of DC power as you most likely know. I would not personally want to put that kid of a draw on my RV batteries.
Most people I know who ran amps HF used the solid state amps. And many of those kept the transmissions short or ran additional means of supplying current to the amps.
This is from the manual on the Ameritron ALS-500~~

The ALS-500M uses two pairs of 2SC2879 transistors operating at 13.8 volts nominal in a push-pull output configuration.
High quality RF components combine with load fault sensing, temperature protection, and one switch frequency selection to
make this one of the simplest and easiest to operate amplifiers today. The ALS-500M operates on 13.8 Vdc electrical systems
and draws a peak current of 80 amperes at full output.

That kind of current draw is very hard on batteries in an RV if that's the way you are set up. For the amount of signal level you will gain with 500 watts I am not sure it's worth all the trouble.

I have run a number of amps at home but having 120v or 220v available makes a big difference. And at the price of gas today I would not want to think about running a genset for a couple of "S" units.

Not trying to tell you what to do, but to me for the overall expense and what you will get out of it the whole thing mobile is just not worth it to me.

Now as to your low signal the other parties are reporting. I assume your mic gain is set and you are observing your ALC? I always pushed the ALC on the meter on ICOMs I had in the past pretty hard without a reported problem.

I assume your tuning indication is good after tuning the screwdriver to your desired freq?
Is your antenna mounted up so that the element is not along side the coach (again assuming RV here). I have run into a number of RVers that mount screwdrivers and other antennas on the side of their coaches and then find the performance is not what they expected.
I have been told "but the coach is fiberglass" only to find and show the owner that the coach has metal framing like mine does under that fiberglass causing problems for the antenna.
And is your antenna ground properly bonded to the ground on your RV? I know High Sierra recommends their braid but I have used plain old plumber's tape as a great substitute. You know, the stuff they used to hang pipes with? If you look you can even find it in hardware stores copper plated steel which I prefer. I learned that trick from a 52 year ham friend that is now an SK.
Not an expert here, but I did work an antenna shop and on radio gear for the Navy as a civilian and been playing with this stuff for awhile.
Just trying to give you some ideas for improving your signal.
Semper Fi in your sig? I was Army 66-72. Radio operator and instructor.

[Manual Garcia O'Kely]

Yep, you have the ALS-500 the SGC Smart Cube and the Tokyo Hi-Power 400 watt offering.

Most guys who mobile with amps use a rather large battery AT the amplifer, in addition to heavy gauge cables from the primary auto battery - This allows the battery to compensate somewhat for the voltage drop.

From what I've read, the SGC is pretty robust and will take lower voltages fairly well, but most of them will draw a max of 80 amps or so - SGC says 40 average on SSB.

Your main concern when running on storage batteries alone is the voltage drop - it's going to take a fair sized battery bank to give you an average of 40 amps for very long.

I don't have any good advice but it would not surprise me if 200+ amp/hour capacity is needed to give a couple of hours of amp operation - although when receiving obviously the draw is much less.

So then the operative question is 'how big IS your house battery?'

[Richard Stouffer]

I have a Power Cube and it is robust. I've tried with limited success to use it as a base station unit, but the power supply requirements can be an issue. I have been using a 50 amp continuous, 70 amp unit peak with limited success, but a 90 amp peak is recommended. I will eventually try to rig it for my mobile operation and that, in my estimation, is going to require another battery, and the closer that battery is to the amp, the better.

Here's a link that does a very good job of detailing mobile installations for the Power Cube:


http://www.sgcworld.com/Publications...Mobilebook.pdf

By the way, the Power Cube is a lot of bucks for 500 watts, but it is built like a tank.

[Richard Stouffer]

I forgot to mention, the pdf link I provided does a very thorough of explaning mobile power requirements and the sizes of batteries and alternator that you can get by with.

[w7wv]

I think he either chickened out or is trying to figure out just how long he can key down with 2 house batteries!

[w6pea]

No
I have 8 house battery's. And 2 chassis battery's and 2 alternators, just like in an ambulance.

I had 2 coach batterys and added 6 more.

[w6pea]

Also a good mobile amp is a little more than I want to spend. Any way I don't spend a lot of time on HF any way. I need to do a little more experimenting

[w7wv]

Yes cost for the gain is expensive.
You will find that improving your antenna may just give you what you want assuming you have a problem at all.