Go Back   WorldwideDX Amateur Radio Forums > Amateur Radio Related > HandiTalkies


Amateur Callsign Lookup
Enter Callsign:

Audio quality of 440mhz compared to 2m on HTs

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-31-2010, 08:33 AM
iTrader: (11)
 
Join Date: Apr 2002
Posts: 8,188
Moleculo has disabled reputation
Default Audio quality of 440mhz compared to 2m on HTs


The other night I was talking to someone on my VX-8 HT on 440 simplex. He remarked that the audio quality sounded over driven and basically sounded bad. I have never monitored myself on 440 with the HT before, only 2m. So I flipped on my Yaesu FT-897D, put some headphones on and put it on the same 440 frequency to listen. I was surprised at how different the radio sounds on 440mhz compared to 2m, which has terrific audio. On 440, as soon is key the mic it sounds like gain is jacked way up, regardless of where I actually set the mic gain on the radio. The best way I can describe it is that it sounds "splatty". Also, when you turn on a CTCSS or DCS tone, it gets even worse. I can definitely hear the DCS underneath and the CTCSS affects it also.

I'm wondering if anyone else has ever monitored themselves on both 2m & 440 from their HT and noticed much difference in the audio quality? Perhaps mine just needs to be sent in for a good alignment? Perhaps when I get time, I'll post an MP3 of the audio so you can hear it. I don't have another HT to test with right now, so I'm looking forward to hear your results.


Reply With Quote
  #2  
Old 01-31-2010, 09:23 AM
GLR GLR is offline
Keeping It Good Natured
iTrader: (0)
 
Join Date: Oct 2007
Posts: 2,241
GLR is on a distinguished road
Default

This is a new one to me. I don't have a VX-8 to try this with as I've moved entirely to the Chinese HT's but I've never had any issues at all. Look forward to hearing the audio.

Reply With Quote
  #3  
Old 01-31-2010, 11:33 AM
Captain Kilowatt's Avatar
Professional Amateur
iTrader: (1)
 
Join Date: Apr 2005
Location: Nova Scotia,Canada
Posts: 11,097
Captain Kilowatt will become famous soon enough
Default

That's a new one on me too. I use a Kenwood TH-G71A dual bander and don't see any difference between the two bands. Does that rig have two different deviation adjustments,one for each band?
__________________
There are 10 kinds of people in this world. Those that understand binary and those that don't.

Reply With Quote
  #4  
Old 01-31-2010, 04:25 PM
iTrader: (11)
 
Join Date: Apr 2002
Posts: 8,188
Moleculo has disabled reputation
Default

OK, here's the test clips. The output is run from the Yaesu FT-897 into a computer. The level is down a bit to prevent over driving the mic input, so you might have to turn your speakers up.

What's weird is that I couldn't reproduce the same thing that I heard the other night. This clip actually sounds pretty good. Perhaps a couple of full battery charges and radio resets between then and now cleared up whatever was making the 440 side sound like garbage. I sure wish I had thought to record that so you guys could hear it...strangest thing ever.

In this recording, you CAN hear the subaudible CTCSS and DCS stuff just underneath the voice. That's pretty strange.
Attached Files
File Type: mp3 2m-440 test.mp3 (1.92 MB, 19 views)

Reply With Quote
  #5  
Old 01-31-2010, 04:26 PM
iTrader: (11)
 
Join Date: Apr 2002
Posts: 8,188
Moleculo has disabled reputation
Default

Quote:
Does that rig have two different deviation adjustments,one for each band?
Actually, yes it does...but that was the first thing I looked at when I first heard this.

Reply With Quote
  #6  
Old 01-31-2010, 06:05 PM
Senior Member
iTrader: (0)
 
Join Date: Mar 2005
Location: england
Posts: 2,104
bob85 is on a distinguished road
Default

its normal to hear other peoples tone when listening on some radios, not sure about the 897, did you have the 897 on narrow rx on all the samples?,

when you first keyed with the tone on it sounds like a slow locking vco but it goes on to sound loose, im not sure it is the tone we can hear , it sounds like its wobulating, bass and deviation increase,

when you put dcs on, bass and deviation step up significantly and the wobble gives a strange submarine sounding quality, i was expecting a sonar ping,

you say its much better now than it was, does the radio temperature change the audio quality,

i hope you can fix it,

good luck.
__________________

tom bearden taught me that quantum entanglement allows thought to travell faster than the speed of light, this explains why at first you can think somebody is smart but if you wait a while you will see they are not very bright at all.


Reply With Quote
  #7  
Old 01-31-2010, 06:38 PM
W9WDX Amateur Radio Club Member
iTrader: (0)
 
Join Date: Mar 2005
Posts: 2,130
KingCobra_CDX882 is on a distinguished road
Default

Myself..
I never noticed a difference using 2 meters verses 440..
I use T90a, IC 91AD and THF6a..
never had those issues with any of them

Reply With Quote
  #8  
Old 01-31-2010, 06:58 PM
iTrader: (11)
 
Join Date: Apr 2002
Posts: 8,188
Moleculo has disabled reputation
Default

I had the 897d on standard FM on all the samples.

Quote:
you say its much better now than it was, does the radio temperature change the audio quality,
Hmm...now that's an interesting question. I had been using the radio for a while, so maybe that's the cause? Bob, you're kind've hearing it the same way I do.

Reply With Quote
Reply

Bookmarks
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 On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
29 xlr audio quality stingray CB Band and CB Radios 1 10-29-2009 03:47 AM
difference in audio quality of 500v , sweep tubes and linear amps BOOTY MONSTER Amplifiers 8 08-16-2009 11:15 AM
Stock Cobra 2000GTL "air noise" on TX Crazy_D General CB Services Discussion 13 09-30-2007 01:33 PM
Galaxy DX949 Audio quality Fdtrucker General CB Services Discussion 7 09-22-2005 06:21 PM
Better Audio Quality Dirty Green General Ham Radio Discussion 1 09-09-2003 02:09 PM


All times are GMT -7. The time now is 06:07 AM.


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