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Tech808
Moderator
Username: Tech808
Post Number: 7086
Registered: 8-2002
| | Posted on Tuesday, September 13, 2005 - 9:12 pm: | 
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This Topic has been moved here form the Open Area of the Copper Forum.
Lon
Tech808
CEF808
N9OSN |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 532
Registered: 1-2005
| | Posted on Saturday, September 03, 2005 - 6:40 pm: |
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I'm now looking for a good desk mic for my 4800. I really just want a regular unamplified desk mic since my radio already has a mic gain and is really loud with my new setup. I'm almost sure that using an amplified mic on my setup it will sound like POO! Any sugestions? |
Dx431
Senior Member
Username: Dx431
Post Number: 1089
Registered: 2-2002
| | Posted on Saturday, September 03, 2005 - 7:35 pm: |
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You can find unamplified D 104s on unternet aucton sites pretty reasonable.
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Bc910
Advanced Member
Username: Bc910
Post Number: 609
Registered: 7-2004
| | Posted on Saturday, September 03, 2005 - 9:13 pm: |
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Hot wire, I have personaly prefered amplified mics for desk mucs so I can sit back from it and talk. The amplifier isn't an amp like on you stereo at home or anything, the wattage comming out of the mic is not any more than a stock mic, instead it is a pre-amp which means it amplifies the sound it pics up but not the wattage going out (that's my understanding of it any way. Tell you what drop me an e-mail, I have 3 days off this weekend and can slap my D104 M6B on your stuff and we can see how that all works! Basically where I am going with this is I think you should get a D104 Silver Eagle or something like it and you will be very happy!
Give me an Email and Ill send ya' my number
We can make a day out of it, and maybe you can help me out with some SWR problems I've been having with my Wilsone Silver load.
TTYL
BC |
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 1381
Registered: 7-2004
| | Posted on Sunday, September 04, 2005 - 12:36 am: |
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3 days off, huh? maybe you should get those glasses fixed . or at least find a way to get on channel 13 a couple times so we can hear YOUR S9 |
Hollowpoint445
Advanced Member
Username: Hollowpoint445
Post Number: 733
Registered: 6-2004
| | Posted on Sunday, September 04, 2005 - 2:18 pm: |
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Unamplified D104s are not a good choice for newer radios that want a low impedance (600 ohms) microphone. The D104 element is crystal and it's impedance is about 50,000 ohms - considerably higher than 600 ohms - and because of the impedance mismatch there will be an attenuation of bass frequencies. The already high cut tone of the D104 will be greater emphasized and make your voice sound thin and high pitched.
This is originally why Astatic added the amplifier to the D104 - impedance matching - because the microphone already had plenty of output. Unfortunately the amplifier didn't match the high impedance of the crystal element very well and you still have some rather high pitched audio even with an amplified D104.
There are circuits you can build to use an unamplified D104 with a low impedance radio if you already own one. Most are designed around an MPF102 FET. Do a google search for d104 and mpf102 and you'll find lots of ideas to try. |
Hollowpoint445
Advanced Member
Username: Hollowpoint445
Post Number: 734
Registered: 6-2004
| | Posted on Sunday, September 04, 2005 - 4:44 pm: |
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"I have personaly prefered amplified mics for desk mucs so I can sit back from it and talk."
This is a big problem when using a desk microphone. The farther away from the microphone element, the more detail of your voice is lost. Sound waves degrade rapidly with distance. Then there is the problem of background noise entering your audio which seems to be a huge problem for folks using a D104. Often you can hear the paint drying on the walls as well as the person talking on the radio.
You get the best results with any microphone when you close talk it with a normal or slightly softer than normal voice level. The detail of your voice is better received by the microphone element and background noise is reduced so you'll sound better to receiving stations. |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 543
Registered: 1-2005
| | Posted on Monday, September 05, 2005 - 3:25 pm: |
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I've noticed that hollowpoint. My Astatic 636 L sounds great on my 4800. On this mics you must talk very close. I myself talk soft just normally like if we were face to face. I DO NOT want background noise. Maybe I should use the K.I.S.S. method and just stick with what I have. Heck I now have the best audio I ever have had. Other operaters have even admired my audio since the Texas Star has been hooked up with mic gain at 1 o clock. |
Bigbob
Senior Member
Username: Bigbob
Post Number: 2180
Registered: 12-2001
| | Posted on Monday, September 05, 2005 - 6:42 pm: |
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If your amc shunt transistor is operative,use whatever amplified mike you want,the extra will be dumped by the shunt thus no bad sound.Bigbob |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 547
Registered: 1-2005
| | Posted on Tuesday, September 06, 2005 - 9:55 am: |
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