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Icom SM-20 Manual

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Icom SM-20About Icom SM-20
Here you can find all about Icom SM-20 like microphone and other informations. For example: manual, desk schematic.

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User reviews and opinions

Comments to date: 11. Page 1 of 1. Average Rating:
misty4 5:17pm on Friday, October 29th, 2010 
cual es la diferencia con el Iphone 3g 16gb ? otra pregunta este aparato que anuncian aki es el precio pero si se agarra un plan con ATT?
ogidew 11:13am on Thursday, October 28th, 2010 
In conclusion, Desire still need some minor adjustments, but overall its probably the best phone for me. Open source. Since buying my phone, cannot open sms programme. I get an error saying "force close" then my screen blacksout and restarts. One of the best phone . . cool, nice UI, and fast battery life
dajonzboy 4:20am on Wednesday, August 4th, 2010 
A Technological Marvel I will give this a honest review. with getting to sound like a fanboy. Firstly the design, fresh clean lines.
Globus123 7:30pm on Saturday, July 31st, 2010 
I had decided that my first plunge into the world of the "smartphone" was going to be the iPhone with the release of the iPhone 3GS.
laughmaster 1:38am on Monday, July 26th, 2010 
The iPhone in its fourth generation and competition grew over the years to a formidable force to be reckoned with. The Apple iPhone 4 is arguably the best phone on the market today. With a sleek.
feasil 1:19pm on Sunday, June 13th, 2010 
Overall, a well-polished device that anyone can pick up in a few minutes and be using basic smartphone features in no time. However, power users.
Dalai 8:42pm on Thursday, May 27th, 2010 
@alede Sorry, but what the hell are you on about? The iPhone 4 is leaps and bounds technically superior to the 3GS. "Used the phone once and loved it, would like to be able to get one of my own on contract but three dont have any plans for existing customers :(" "Having previously owned a HTC Hero I have suffered numerous issues including very buggy software.
LECOEUR-JB 12:55am on Thursday, May 27th, 2010 
Very good iphone thx Very good iphone thx Self containing unit without flaps or battery doors. Stbrong Cute looking device that has more status than functionality. The new 4.
antibia 10:06am on Thursday, April 15th, 2010 
The iPhone is almost as easy a phone to review as it is to use. The fourth iteration brings with it much-desired changes to the operating system.
zev 5:47pm on Thursday, April 8th, 2010 
when can we upgrade to android 2,2 where battery life is said to be improved? just felt the ph can be great if battery life can be extended..
Mic Q 6:00pm on Tuesday, March 30th, 2010 
If u wanna watch a dvd or play games on any phone for prolonged periods of time, what do u expect, it runs on a battery the size of a 50 cent piece.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




A subjective evaluation of various microphones on-air using an Icom IC-7700 was performed 18 July 2010 with VA7JW transmitting to VA7OJ on 15 m. VA7OJ provided opinion of the transmitted voice quality. It had been noted, and reported variously on the web, that the Heil HC4/HC5 dynamic cartridges have low output, and so Mic gain had to be set rather high to achieve ALC deflection, and achieving compression was difficult. Bass and Treble controls were set at 0dB, factory default. Possible defects or problems with the VA7JW Heil Pro Set + headset and adaptor cord was eliminated as a possible problem. VA7JWs headset & adaptor were tested VA7OJs station, noting performance against his Pro Set +, adaptor and IC-7700. Performance was identical. Audio preamps were built at VA7JW to raise Mic input levels to improve Mic, ALC, COMP gain setting ranges. Two versions were attempted; a discrete 2N3904 amplifier with a 2N3904 emitter follower, and dual op amp MC33172 equivalent, both with 20 dB gain. Both used the +8V supply available at the Mic jack. While they performed well in terms of gain, fidelity and bandwidth, the idle noise produced in both circuits was only about 15 dB below signal. A source of unusual low frequency rumbling (not hiss) was unable to be determined, and was identical under both circuits! The preamp concept was abandoned without resolution. Mics tested were: Heil IC (electret) Heil Pro Set + HC4 and HC5 (dynamic) Icom SM-20 Desk Mic (electret) Icom HM-36 Hand Mic (electret)
The IC-7700 is connected to a Rigblaster Duo controller. IC-7700 controls were set at COMP ON WIDE, MIC and COMP varied to achieve ~ 50% ALC and 6-12 dB compression. RF Power set at 100%. Transmit bandwidth was set a 2.4 kHz. Test 1 Heil IC Adjusted Bass = 0 dB, Treble = +3 dB 1 Mic Gain about 11 to 12 oclock ALC easily met 50% COMP easily in range of 5- 10 dB It was determined that the effect of inserting the Rigblaster DUO, as opposed to connecting the Mics directly to the 7700, was minimal, with possibly slightly better sound with DUO inserted! Connection through the DUO is metallic but with bias & switching circuits attached. The DUO was left In-Circuit for all tests except for the (abandoned) pre-amp tests where the connection was direct to the 7700. Subjective quality was good. Used this as the standard against which other Mics were judged.
This setting determined for 2 reasons. A) judged as best intelligibility over air and B) best setting for power distribution. Voice audio has most power concentrated in the lower frequency range while intelligibility is attributed to the higher frequency range. The 3dB Treble boost accentuates intelligibility under difficult conditions, and by not boosting Bass, RF power is made available for the high frequency audio to give punch.

22 July 2010

Test 2 Heil ProSet + Same Bass / Treble setting MIC Gain had to be set to 3-4 oclock to compensate for the low output levels ALC was 50%, but was limited COMP just made the 6 -10 dB HC-5 cartridge sounded much like the Heil IC HC-4 cartridge sounded good as well but more penetrating. Concluded HC-4 had the edge for contest & DXing Test 3 SM-20 This is a high output mic and so settings were much the same as the Heil IC Heil IC sounded better (surprise! this is supposed to be a very good full range Mic) Test 4 HM-36 Also a high output mic and so settings were much the same as the Heil IC Heil IC sounded better. Suitable for portable use. Other Observations The spectrum of VA7JW transmitted signal looked good, i.e. no excessive bandwidth occupancy, in all instances as observed by VA7OJ. A Coaxial Dynamics (Bird equivalent) in line Watt meter measured RF Power Out. This meter is capable of measuring both Average Power and Peak Power. Full peak power was achieved under these tests. It was interesting to observe average power output as COMP is increased. Typically, Peak Power 200 W Avg Power, No compression Avg Power, 6-10 dB compression

10-15W ~ 50 W

ALC and COMP levels used preserved audio quality. The Heil IC has a higher output than the Heil Pro Set + and provides lots of adjustment headroom. The Heil IC is a lighter, more comfortable headset compared to the Heil ProSet +



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