Open Roads Radio forum for Ham, Amateur Radio and RV camping


Reply
 
Thread Tools Display Modes
 
Old 09-25-2014, 10:51 AM   #1
w5sq
Junior Member
 
Join Date: Aug 2011
Posts: 3
Default Mobile HF Amp issues

Hello,

Does anybody have experience using an ALS-500 or any mobile HF amp in an RV? I have used my ALS-500 for yrs in my old 93 Dodge diesel pickup which does not have a computer operated engine. I now want to operate from my 2006 Air Stream Sprinter RV and do not want any problems from stray RF getting into the Sprinter diesel electronics. Any comments?
Joe
W5SQ
w5sq is offline   Reply With Quote
Old 09-25-2014, 11:51 AM   #2
wa8yxm
Senior Member
 
Join Date: Nov 2007
Location: Mobile, on the road
Posts: 1,125
Send a message via AIM to wa8yxm Send a message via Yahoo to wa8yxm Send a message via Skype™ to wa8yxm
Default

While I can not speak for Motor homes. I know car makers are now testing with high power radios.. In many cases they give a Ham Radio Operator Engineer a test car to drive, complete with a full gallon of radio..... The reason.. Well.. Imagine the following scenario.

Patrol officer is doing Speedlimit plus when IDIOT flys by so fast he does not even know he passed a patrol car.. Officer puts the pedal to the metal to catch this idiot before he kills someone ... Dispatch this is Adam Twelve (Ok so I picked a TV show for the car ID) I;M iIN (Sputter sputter cough engine dies), I was in pursuit of a speeder but my car died.

I actually know a trooper that sort of happened to.. Only .. Well major differences.
(1: He was trying to join in a chase)
(2: He put the pedal to the metal, then dropped it in Drive, and blew every seal in the tranny,, Engine kept running)

(We told him DRIVE FIRST, then floor it)
wa8yxm is offline   Reply With Quote
Old 09-25-2014, 01:59 PM   #3
w5sq
Junior Member
 
Join Date: Aug 2011
Posts: 3
Default hf Amp issues

Glad to hear the manufacturers are doing research. I had it in my 98 E300D and had a slight mis match at one time and got a bunch of garble de gook across the dashboard. Turned the car off and waited awhile and recycled the ignition a couple times and everything went back to normal. Was worried sick I was gonna have to take it into the Benz dealer and open up my wallet for re-programming or new computer or whatever....

Joe
w5sq is offline   Reply With Quote
Old 09-25-2014, 06:07 PM   #4
N3LYT
Senior Member
 
Join Date: Jun 2012
Location: Maine
Posts: 659
Default

Most manufactures set the limit at 100 watts for mobile operation. Yes I know those that use 500 but they are lucky. My old Audi's cruse control would drop out as soon as I transmitted on 6 meters at a 100 watts.The newer the vehicle the worse it gets every thing has to be hardened for RF just so many things the public demands in their living room on wheels.
N3LYT is offline   Reply With Quote
Old 09-25-2014, 09:33 PM   #5
Mr. Ham
Member
 
Join Date: Aug 2014
Posts: 95
Default

Radio 101

Amplifiers are only used when all other attempts at using a more efficient antenna has failed.
Amplifiers do not amplify the receive, only the transmit.
Even if you amplify the receive - there is so much noise, there is no benefit.

Where I come from, people uses amplifiers to make their signal appear louder.

This limits you to talking to other people that has made their signal louder, or someone that just happens to be in your range - that can hear you, that you can hear.

Keep both hands on the wheel and quit trying to be a CB'r.

The State Police here has a Falcon radar gun that is equipped with a vehicle shut down mode that selectively shuts down the electronics of the vehicle they are in pursuit of.
Unfortunately, if they press the trigger, there is no way to keep the RF from shutting down their own vehicle.

In todays world if you want to disable a persons vehicle, you run the VIN, call Onstar and let them shut it off for you.
This is the reason why I do not like new vehicles with factory equipped OnStar. Even if you have not paid the bill, it still is hard at work gathering information and selling it to those that are willing to pay for it.

Where you go, how frequent you go there. How fast you go, how many revolutions per a minute your engine turns etc..
If your vehicle is stolen, they can usually find it, or give you the last known location within about 3 minutes of when you call them.

Many new Ipods, Ipads, etc also have the same capability.
Mr. Ham is offline   Reply With Quote
Old 09-25-2014, 09:37 PM   #6
Mr. Ham
Member
 
Join Date: Aug 2014
Posts: 95
Default

If I had a all metallic vehicle and I wanted to operate HF, the very first thing I would do is call DX Engineering and buy about 100' of 3 inch copper strap and bond all the surfaces together to make the vehicle appear to the RF as being one solid object.

Unfortunately in today's world, everyone wants to be a CB'r and just stick a mag mount antenna on the roof and transmit.
The art of installing radios has been lost somewhere in the transition between the older generation and the newer.
40 years ago, vehicles were mostly steel, with very little plastic, today vehicles are plastic and exotic materials, and yet we still want our radios to work the same way.

There is very little that we can do about it except try to use Hamsticks or Tarheel antenna's and a antenna tuner...

If you are going to run 1KW on 40 or 80 meters and you do not have sufficient surface area, you are going to need one heck of a antenna tuner.
Mr. Ham is offline   Reply With Quote
Old 09-26-2014, 10:28 AM   #7
N3LYT
Senior Member
 
Join Date: Jun 2012
Location: Maine
Posts: 659
Default

Not a lot of chance in a pile up no problem hearing a big station with a big beam but a lot of problem hearing my little pw station on a 100 watts and a dipole with 15 others calling some times an amp is the only way to get a rare one. The Falcon radar units will not stop a car they are designed to defeat radar detectors they lock speed and stop transmitting. Data from a on board engine computer is read only there is no external input. On Star and your cell phone do have GPS TX data you can turn that off on the phone to 911 only that's up to you.
N3LYT is offline   Reply With Quote
Old 09-26-2014, 10:44 AM   #8
N3LYT
Senior Member
 
Join Date: Jun 2012
Location: Maine
Posts: 659
Default

You can weld the doors shut and bond the exhaust to the radio use a 100' of copper and you will still have all most worthless ground plane. Vehicles make very bad ground planes for HF. The bed of my pick is composite my HF still works. The key is a resonate antenna and not worrying about the fact you are working QRP with a 100 watts.
N3LYT is offline   Reply With Quote
Old 09-26-2014, 04:10 PM   #9
W5DOK
Old Member
 
W5DOK's Avatar
 
Join Date: Oct 2010
Location: In Gods country
Posts: 253
Default

Although cars were all steel 40 years ago, radios were also not nearly as sophisticated as todays radios. My motor coach is mostly fiberglass, yet my Tarheel 200 works great behind my Icom. The antenna is only bonded to the coach frame for a ground plane. Although the radio has a built in tuner, it's rarely used. I select a band and the radio tunes the antenna to that band.
I've never owned a cb radio, so I don't consider myself a cb'er. BTW the motor home is an electronic marvel and the Ham equipment has never given it any issues.
Doc
W5DOK is offline   Reply With Quote
Old 09-26-2014, 09:13 PM   #10
w5sq
Junior Member
 
Join Date: Aug 2011
Posts: 3
Default

I have operated an ALS-500 amp generally running about 400 watts for close to 20 years in an older 93 Dodge Cummins Diesel pickup with a triple mag mount on top of the cab and mfj hamsticks. The amp makes a big difference in maintaining regular contact with a group of guys I talk with frequently. A lot of the time they would hardly hear me with 100 watts, particularly on 75M, since the ant is so inefficient. I will get it worked out sooner or later, but just thought I would ask on here just in case someone had been there done that. CB radio would be new to me; I have been a ham since 1960, right after they took the 11 meter band from us. Thanks for all the feed back.
w5sq is offline   Reply With Quote
Reply

Tags
mobile hf amp issues

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 12:17 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.