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CM 3885
| | Posted on Wednesday, January 29, 2003 - 6:23 pm: | 
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Whats the deal with my radio?
ON AM it will only modulate to 100 watts or less on AM with normal voice. But with a whistle it will shoop on up to 175 or so. even with a power mike it will act all funky and stuff. It only does this on my moonraker on the vertacke side with a swr od 1.2=1 but on the horizontal side it will act normal. Im guessing its the 2995s fault as my other radios dont act up like this when i hook them inline.. If i cant find a solution to this problem ill probably sell the radio. Problem is no techs in my area will work on a surface mount radio! I guess i should have looked for an older 2990 on ebay instead of getting this new radio that nobody will fool with... |
DE
| | Posted on Wednesday, January 29, 2003 - 9:54 pm: |
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Your radio is working just fine. I checked the specs on your radio...
http://bobscb.com/10Meter/rci/2995dx.htm
That particular radio is per the specs (scan to below the picture of the radio) to have an AM/FM/CW output of only 50 watts.
The max SSB output should not excede 150 watts.
Per what you have said there is nothing wrong with your radio and you should probably not be using a power mike on it. I would suggest a good unamplified mike such as a Heil Headset mike. |
Devildog
| | Posted on Wednesday, January 29, 2003 - 9:55 pm: |
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I love my 2995DX.....This thing is awesome. I have used an a lot of different mics on it and the best so far is my Turner+3b....It really makes this radio modulate. I am using mine with a I10k with swrs at 1.1 |
CM 3885
| | Posted on Wednesday, January 29, 2003 - 10:32 pm: |
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Why not a amplified mike? I run a D 104 night eagle. Everyone runs D 104s and other amplified mikes on it and ive never not ranned an unamplifeed mike on pretty much all my radios ive runned. The only radio i run that i dont really need a power mike (i do run a silver eagle or a robyn desk mike on it because i like to sound loud on it) on is my ranger AR 3500 but then again that radio has no peers and is in a class by itself!!!:-) I do think my radio has a problem because it will key up 20 watts and swing to about 120 but then it will swang backwards to 70 watts. I think theres a problem with my radio... Ill find a tech that can fix the problem and if it cant be fixed well bye, bye, goes the radio!!! |
Tech671
| | Posted on Thursday, January 30, 2003 - 5:33 am: |
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There's nothing wrong with your radio, that is the limiter engaging. If you are getting a problem from a particular mode of your antenna there's likely a reflection or impedance issue reacting with that radio. I really think your radio is fine, you may not be used to having a rig with the limiter still intact. ;) |
de
| | Posted on Thursday, January 30, 2003 - 7:43 am: |
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Why not an amplified mike? Not a dumb question. Why not is simple. The clean understandable signal is one that is not necessarily LOUD. Rather it is very inteligible. It is a signal that conveys all the frequencies of the human voice. A good non amplified mike with a frequency response designed to cover the frequencies of the human voice.
Some people use an equalizer between their mike and the radio to fine tune the output of their mic so as to filter out certain frequencies and enhance others. This gives the overall tone of the mic a nice full bodied sound. Rad Shack used to make one but I am not sure if they still do????
If you want to assist your vocal qualities and average power beyond your natural vocal abilities you might try a compressor unit. This is not an amplifier. It is an electrical devise that takes your voice pattern and chops the highs while it boosts the lows. As a result you get a little harder 'push' from the mic on the average spoken word. BUT be careful how you tune/adjust it. It can also disotort the way you sound on the receiving end.
Let me put it this way to make it a little easier to understand. Cover your mouth with your hand and speak a little loud. It sounded kind of distorted, mumbly. Now remove your hand, slow down and speak clearly and calmly in your natural voice. Which one did you understand the best. If the person on the receiving end hears only gargled mumbles and cannot understand what you are saying a big needle swing will not mean a heck of a lot.
For then number crunchers only. Per the books, in order to get a single one S unit incrase on the receiving radio you will need to multiply your output between 3 and 4 times its current output. So if you are running say 4 watts to get one more S unit you will need to run 3 times 4 or 12 watts and to get 1 more beyond that you will need to run 12 times 3 or 36 watts. At some point it becomes rediculous to even attempt the extra S Unit. At some point you just have to sit patient and wait for propagation to improve. Some things just cannot be forced. |
CM 3885
| | Posted on Thursday, January 30, 2003 - 12:25 pm: |
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So what you are saying is if i run like say a SP-1A it will work in my 2995> ive wanted to try one of them for a long ti e in my AR 3500 but all the guys that i talk to say the radio sounds great with just a stock mike or the silver eagle well, actually they say the robyn desk mike i tun sounds awesome on the 3500 so i leave it at that. I talked to 2 guys on the air last night about my 2995 and they both said it sounded great. one guy was 65 miles away and the other way 18 mile away and they both said it sounded loud. Buty either way i still always run a power desk mike on my base radios because it all has a lot to do with the way i talk on the radio. i sit away from the radio and i use the mike like an arms lenth away fromn the rig and besides a stock handmike on a big fancy base station always looked dorky as heck to me! ;-) So for me power desk mikes will stay! |
CM 3885
| | Posted on Thursday, January 30, 2003 - 12:49 pm: |
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tech 671. how would the radio react to reflection like that when all my other rigs seem to act fine with the antenna? I mean my swrs are like a 1.2-1. I find that odd.... I hooked another piece of equipment inline last night and the radio now acts all normal fine and dandy. My swrs are now a 1.3-1 now but the radio acts normal... Im thinking it might be a bias problem?? |
CM 3885
| | Posted on Thursday, January 30, 2003 - 12:50 pm: |
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What im saying is it seems the lower my swrs the more that radio acts funky and stuff.. |
Insider
| | Posted on Thursday, January 30, 2003 - 4:50 pm: |
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Just for clarification, purposes
A wideband compressor doesn't deliberatey chop off the high frequency response and boost the bass. That's just a phenomina that occurs when the compressor is used for leveling due to the high input gain required to bring the low volume portions of the signal up. The bass frequencies tend to dominate the VCAs gain action resulting in a muddy and sometimes pumping sound.
For HAM and CB, I'd cut down on the bass and highs when using a wideband compressor for leveling purposes (low threshold, high compression ratio). That way the mid or presence range is dominating the gain action of the amps. This should give the most natural sound when the amps reduce gain to bring the loud parts down and increase it to bring the soft parts up.
This approach will tend to amplify a lot of background noise, so you may also want a noise gate or expander inline to mute the audio between words.
Since most compressors want a line level input at minimum, you'll need a mic pre-amp or you might get enough audio out of a D-104 to drive it. Some of the better compressors divide the signal into three or more bands and process them seperately to reduce the amount of muddiness and pumping at higher compression levels. |
CM 3885
| | Posted on Thursday, January 30, 2003 - 10:45 pm: |
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I say HUH!!!???!!! I dont get that! Hmmm :^/
Im just an average CBer with a high school eduacation not a tech so i need you to explain that to me in better terms, LOL |
Insider
| | Posted on Friday, January 31, 2003 - 5:36 pm: |
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Okay, a wideband compressor is kind of like having a sugared up ADHD five and 1/2 year old who hasn't had their Ritalin yet sitting at the mic gain control of your radio and pumping it way up when your voice gets soft and then lightning fast turning it down the at loud points in your speech.
Leveling means making all the sound relatively equal in volume. Radio stations do this to hopefully sound louder than their competition and to smooth out level differences between songs, commercials, ect. You can see this by recording a small portion of a radio station's audio into your computer and looking at it in a wave editor. You'll likely see that the audio looks like a block with few real peaks and valleys.
The goal of leveling in AM broadcast for instance is to bring up the audio such that the mod meter goes up and just hovers between 85 to 100 percent modulation under most program material including plain speech (high modulation density).
On a peak meter, you'd see an initial swing and then a steady back and forth motion of the needle while modulating.
DE's warning about distortion and muddiness is accurate. Compressors are a bit touchey, especially if you're trying to level music due to the complexity of the program's volume (dynamics) |
CM 3885
| | Posted on Friday, January 31, 2003 - 9:08 pm: |
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So the SP 1A is kinda what you are referring to in a sense i think? |
