GMRS/ FRS 对讲机 工作频率为462MHz～467MHz，申请FCC 认证，SAR 是否必须？

wailand

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Q: We have a GMRS/ FRS walkie-talkie that operates 462MHz to 467MHz; do we need SAR measurement for FCC certification?

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A: Unfortunately there are different power levels for SAR when submitting to the Commission or a TCB. The Commission specifies one level for its submissions and another for submittals to TCBs. The Commission is currently working on making a single level for both submissions, but this is not yet a reality.

The Commissions procedure “Federal Communications Commission OET Laboratory Division March 18, 2004 Mobile and Portable Device RF Exposure Equipment Authorization Procedures” section 1, Portable push-to-talk (PTT) – Parts 80, 90, 95a states the following:
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; ]2 e0 O6 ^1 y6 }" g8 w$ [" E; X- g' Ma) For equipment certifications submitted to the FCC, SAR data is requested for GMRS PTT radios with either conducted or radiated (EIRP) output power higher than 1.0 W.
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- q8 O0 t- L3 {" x7 Q6 |5 b' D2 w9 xb) For equipment certifications submitted to a TCB, SAR data is requested if output power is greater than the low thresholds in the July 02 TCB Exclusion List.

c) Basic RF exposure instructions, similar to Supplement C body-worn recommendations, are requested for devices that satisfy general population exposure requirements, as part of the §2.1033(c)(3) required operating instructions; RF exposure training instructions and labeling info are requested for devices that satisfy occupational exposure requirements.
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Basically, the Commission requires SAR if > 1.0 Watt (conducted or EIRP) and the application is submitted to them. TCBs require SAR if power (conducted or EIRP) are above 0.256W [using 120/f] assuming face to mouth use and any body clips allows > 2.5 cm spacing if the device is capable of transmitting on the body. If < 2.5 cm, for body worn conditions this would be 0.128 W (using 60/f). Note that for comparison of power to these limits, one can assume that a 50% duty cycle can be applied if the radios are push to talk (most FRS and GPRS are). Additionally, FRS and combined GPRS radios must meet general population RF exposure limits. Though you may be able to submit to the FCC without SAR, the application processing time is longer than TCBs, even then, the Commission sometimes requested SAR data at lower values when there are concerns. TCBs can usually perform the review in a matter of days, but they will require SAR even at lower output levels.

RodgerLan

安规威望:+3(ds1983) 经验分享
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怎么那么多威望呀   [s:79]  [s:79]

ds1983

引用第1楼RodgerLan于2007-09-10 20:08发表的  :
6 \, q4 b% R  B* W% y( X9 e安规威望:+3(ds1983) 经验分享

( F+ i( v/ ^$ P& x# E: i- o! h怎么那么多威望呀   [s:79]  [s:79]

因为一般的好文章一般奖赏1威望，少见或很有用或很新的标准一般奖励2威望。但是以上这些都是搜索一下可以搜到的或者可以要到/买到的。但是wailand这个QA应该是FCC官方或者TCB内部reviewer给的QA，关于如何判定SAR的。这种经验通过自己找/询问一般是得不到的，只有询问FCC官方或者找TCB资深的reviewer才能问到，但都很难解释得这么详细。

4 @/ d4 z$ l1 k/ i并且最近兼容区不太活跃，给稍为高点刺激一下大家多发这种专业的技术帖。

另外如果有很专业狠深奥的技术提问，有人能给出很详细的回答的话，我一般会给3威望或者更高的奖励。因为应人所需，救人所急才是最珍贵的。

以上只是我本人的评分标准，大家可以自由讨论。一般来讲我奖励相对高一些，但有些情况其他版主先奖励了，如果其他人奖的比较低我则不会给很高的奖励，不然好象感觉像有些版主奖励给的高，有些给的低就不好了。这时候我一般会和其他版主奖励统一。