Go Back   WorldwideDX Amateur Radio Forums > Citizens Band Related > Export Radios


Amateur Callsign Lookup
Enter Callsign:

MAGNUM 257 HP Review

Like Tree40Likes

Reply
 
LinkBack Thread Tools Display Modes
  #209  
Old 03-20-2012, 05:42 PM
Tucker442's Avatar
Senior Member
iTrader: (1)
 
Join Date: Oct 2010
Location: Jamesburg NJ
Posts: 824
Tucker442 is on a distinguished road
Default


Quote:
Originally Posted by AdrianofromBrazil View Post
Hello, Tucker442
I live far away, please help me solve this problem with Sam Lewis.
I bought the radios in Gijoes email and they do not respond, the site went off the air Gijoes
I can not stay with this prejudice, for I am poor and bought radios to resell here
Talk to Sam for me
My English and bad
thank you very much
Adriano I got an email from Sam Lewis today about your problem, if you can give me your email address I can put you in touch with Sam about your problems, send me your email to tucker4422@verizon.net and I will foward it to Sam Lewis, is is very concerned about your problems

Reply With Quote
  #210  
Old 04-08-2012, 05:32 PM
Junior Member
iTrader: (0)
 
Join Date: May 2010
Posts: 15
hp1kpn is on a distinguished road
Default 257HP Distorted TX SSB Audio

My 257HP has bad SSB TX audio brand new out of the box. The SSB TX audio sounds distorted and raspy. It sounds alot like RF getting into the modulation. However, I don't think it's an RF problem. Even reducing the RF output to only a few watts still produces the probllem. The SWR into the IMAX 2000 antenna is 1.1 @ 28.450MHz. Swapping in another HF radio into the antenna connection does not have the problem; so that removes the RF as the cause of the problem.

I did a google search on "Magnum 257HP Poor SSB TX audio" and found that I'm not only one having this issue. Some people think the top-gun modulator is the culprit because the previous version of the 257 did not have this problem and the AM TX audio of the 257HP is excellent.

I'm open to any suggestions, otherwise I have no other choice than replacing my 257HP with a different 10 meter rig.

Reply With Quote
  #211  
Old 04-08-2012, 06:03 PM
Tucker442's Avatar
Senior Member
iTrader: (1)
 
Join Date: Oct 2010
Location: Jamesburg NJ
Posts: 824
Tucker442 is on a distinguished road
Default

send it to Chris at the Radio Shop in Ontairo Ca. he is the warranty guy and a great radio tech for magnum radios, if it's new the repair will probably be free if not then his prices are very good and not a lot of down time. If that doesn't work just list in on Ebay for like an hundred bucks someone will buy it even with an issue for that money

Reply With Quote
  #212  
Old 04-08-2012, 06:46 PM
Senior Member
iTrader: (2)
 
Join Date: Aug 2008
Posts: 2,330
9C1Driver is on a distinguished road
Default

Quote:
Originally Posted by hp1kpn View Post
My 257HP has bad SSB TX audio brand new out of the box. The SSB TX audio sounds distorted and raspy. It sounds alot like RF getting into the modulation. However, I don't think it's an RF problem. Even reducing the RF output to only a few watts still produces the probllem. The SWR into the IMAX 2000 antenna is 1.1 @ 28.450MHz. Swapping in another HF radio into the antenna connection does not have the problem; so that removes the RF as the cause of the problem.

I did a google search on "Magnum 257HP Poor SSB TX audio" and found that I'm not only one having this issue. Some people think the top-gun modulator is the culprit because the previous version of the 257 did not have this problem and the AM TX audio of the 257HP is excellent.

I'm open to any suggestions, otherwise I have no other choice than replacing my 257HP with a different 10 meter rig.

The blue display non-RFX-75 radio's had the Top Guns for several years with little or no problems. To be honest you hardly ever heard of a 257 go bad until this newest version with the RFX-75, which is the HP version.

That said it's not the RFX units but rather, I think, some kind of a production or quality control issue. I have never seen a firestorm if problems with Magnum radio's until this newest 257. I wish I knew what the deal was.

Reply With Quote
  #213  
Old 04-08-2012, 07:01 PM
Tucker442's Avatar
Senior Member
iTrader: (1)
 
Join Date: Oct 2010
Location: Jamesburg NJ
Posts: 824
Tucker442 is on a distinguished road
Default

it always amazies me how many people have a 1.1 to 1 swr, either everybody had a crummy meter or they just have no output power. I am creeping up on 58 yrs old, have had almost any antenna made that is under 100 dollars and have never ever had a 1.1 to 1 swr. My best has been like a 1.2 and a little bit meaning like 1.25 or more most of them have been 1.3 to 1.5 with different coax configs or just different coax at different lengths but never had a 1.1 so why don't you 1.1 guys either get a better meter or just go around the band to see it get higher on other channels that you have cuz ALL bs ASIDE not all these people have a 1.1 swr antenna unless they are like doing 2 watts

Reply With Quote
  #214  
Old 04-08-2012, 07:14 PM
Robb's Avatar
Yup
iTrader: (3)
 
Join Date: Dec 2008
Location: Silicon Valley CA, Storm Lake IA
Posts: 8,069
Robb is on a distinguished road
Default

Quote:
I did a google search on "Magnum 257HP Poor SSB TX audio" and found that I'm not only one having this issue. Some people think the top-gun modulator is the culprit because the previous version of the 257 did not have this problem and the AM TX audio of the 257HP is excellent.
There is NO TopGun Modulator in a Magnum 257HP!
lol!
__________________
BASE: Kenwood TS-2000, GAP Titan DX, Diamond X50A, Sirio SY27-4, and IMAX 2000.
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Sirio Z-180. Yaesu FT-8800R & Diamond NR-770.

Last edited by Robb; 04-09-2012 at 10:18 AM.

Reply With Quote
  #215  
Old 04-09-2012, 04:38 AM
binrat's Avatar
W9WDX Amateur Radio Club Member
iTrader: (6)
 
Join Date: Nov 2008
Location: The Great White north
Posts: 1,004
binrat is on a distinguished road
Default

Quote:
Originally Posted by Tucker442 View Post
it always amazies me how many people have a 1.1 to 1 swr, either everybody had a crummy meter or they just have no output power. I am creeping up on 58 yrs old, have had almost any antenna made that is under 100 dollars and have never ever had a 1.1 to 1 swr. My best has been like a 1.2 and a little bit meaning like 1.25 or more most of them have been 1.3 to 1.5 with different coax configs or just different coax at different lengths but never had a 1.1 so why don't you 1.1 guys either get a better meter or just go around the band to see it get higher on other channels that you have cuz ALL bs ASIDE not all these people have a 1.1 swr antenna unless they are like doing 2 watts
You mean you don't key up and turn that litle knob until the meter reads 1.0:1??
jazzsinger likes this.
__________________
A radio is only as good as the person operating it . . .

Reply With Quote
  #216  
Old 04-09-2012, 09:21 AM
Junior Member
iTrader: (0)
 
Join Date: May 2010
Posts: 15
hp1kpn is on a distinguished road
Default Low SWR

Quote:
Originally Posted by Tucker442 View Post
it always amazies me how many people have a 1.1 to 1 swr, either everybody had a crummy meter or they just have no output power. I am creeping up on 58 yrs old, have had almost any antenna made that is under 100 dollars and have never ever had a 1.1 to 1 swr. My best has been like a 1.2 and a little bit meaning like 1.25 or more most of them have been 1.3 to 1.5 with different coax configs or just different coax at different lengths but never had a 1.1 so why don't you 1.1 guys either get a better meter or just go around the band to see it get higher on other channels that you have cuz ALL bs ASIDE not all these people have a 1.1 swr antenna unless they are like doing 2 watts
This is off-topic to my issue, but here's how I get the low SWR on 10 meters:
1. Start with a new IMAX-2000 antenna and trim length according to instruction to tune it to center freq of 28.4
2. Since my coax run is 85' I decided to use LMR400 coax.
3. Antenna is mounted on telescoping fiberglass mast so it can be lowered during severe weather.
4. This base installation gives me an SWR of 1.2 @ 28.45MHz on my DAIWA SWR & POWER METER even with RF output at 50W.
5. To further reduce the SWR, I installed a quarter wave coaxial sleeve inside the fiberglass mast, just below the antenna feedpoint. The coax runs through the sleeve which is attached to antenna ground at the feedpoint. The coaxial sleeve acts as a counterpoise and further reduces the SWR to below 1.2

Reply With Quote
Reply

Bookmarks

Tags
export-radio, magnum 257 hp, magnum 257 review
Worldwide Radio Forum



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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Magnum OmegaForce S-45 HP Review Robb Export Radios 205 03-05-2012 11:44 AM
Trouble with SWR with Magnum 257! Please HELP! hacksaw Installation & Station Setup 26 02-13-2012 11:34 AM
Coming Review: Magnum 257 Robb Export Radios 21 05-04-2010 06:37 PM
Magnum 257 limalimavictor CB Radio Gear SwapShop 1 04-06-2010 10:56 AM


All times are GMT -7. The time now is 10:06 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Worldwide Radio Forum