该小型发射器将使您可以在现有频段内的任何标准FM广播中进行交流，聊天，发送音乐传输，径向不少于500米或半公里。
Warning: Using this transmitter could be illegal in your country or area, take appropriate permissions before indulging.
这个怎么运作
该1.5瓦发射器的电路从根本上配置为通过振荡器阶段驱动调谐的RF放大器阶段。
Referring to the diagram we find that the BC547 is rigged in a oscillator mode which resembles a Pierce oscillator circuit.
BC547的底部受到10K电阻的偏置，至关重要的RF线圈在晶体管的收集器/正面之间连接。
一旦打开电源，该线圈就会在晶体管收集器和发射器上由20pf电容器引起共鸣。
33PF电容器确保电容不超过设计的最大规格。
The above capacitor also determines and fixes the working band frequency of the circuit which is within 80 MHz and 110 MHz.
The varicap diode is included in order to convert the fed input voice or music signal into riding electrical pulses over the carrier frequency created by the above discussed oscillator stage.
该调制信号通过Bocking 33NF电容器馈送到由BD139晶体管组成的放大器阶段的底座。
The BD139 picks up the signals and matches it up with the tuned network across its collector terminals formed by the two inductors and a couple of capacitive trimmers.
必须精确调整这些修剪器，以使输入调制信号通过此阶段最佳地放大并导致最大传输输出。
输出通过另一个电感器终止，该电感器消除了不需要的谐波，并在连接的天线上馈入干净的放大RF调制信号。
Antenna Specifications
The antenna should be a Yagi antenna as used for old TV sets.
The circuit must be attached very close to the antenna, preferably directly with the connecting points of the antenna.
电源可以从外部来源馈送，也可以用于相同的电池。
All the "earth" symbols must be joined together and terminated over a large copper base positioned right under the PCB...this need be done if a designed PCB is not used.
With a well designed PCB, the "earth" points must be terminated with the inbound large copper tracks which should cover the entire area of the PCB running beside the connecting tracks all across the board.
How to Set the presets
The two 10k pot may be used for optimizing the signal strength or the volume of the fed signal which is to be transmitted.
The BD139 will require a large heatsink attached with its tab.
All the coils used for this 1.5 watt transmitter circuit are 0.6mm super enamelled copper wire wound over an air core having a diameter of 5mm.
你好斯瓦加塔姆，
我需要您修改卫星信号查找器电路，并在印度易于使用。
the basic idea is -the power from STB to LNB is fixed, when RF signal get maximum that extra power is used to drive a meter/Piezo buzzer, the buzzer sound vari accoring to available signal strength…. we can use the sound variations to pin-point the Location of satellite, I wish you to modify the circuit with op-amp 741/tba820/tda2822m like components, here is the circuit & video
macq.comuv.com/sat-meter.pdf
http：//www.youtube.com/watch?v=Ohi4XEmYW5w
你好麦克斯，
PDF中显示的电路非常简单，并且使用与系统参数至关重要的标准组件……..因此，我认为不应以任何方式对其进行修改。
OPAMP TLC271并不难获得，因此这不是问题……更重要的是，741的运作方式不会像TLC271那样最佳，因此我认为设计中的所有内容都是完美的，并且必须按照效果进行遵循。
I'll surely include and discuss the design concept in my blog soon…thanks:)
嗨，斯瓦加塔姆
您能为1S99二极管提供一些替代方案，我需要添加蜂鸣器而不是仪表。
Everybody is moving to DTH unwillingly, Digitization. Analog/Cable-TV and terrestrial, will be completely terminated at the end of 2014, In my area analog signals switched off suddenly cause of govt orders.., there r some pirated signal providers, their license also cancelled soon, So circuits like these come in handy for normal people.
嗨，麦克斯，
是的，您是对的…………世界正在迅速发展，我们也应该如此。
您可以Google Google“硅混合器和检测器二极管数据表”，您会发现一些与1SS99匹配的等效物。
哇!在88 - 100 MHz BD139给1.5瓦特。Yarr助教ke a hike. If it was 2n3866 we could have some power. de vu3inj
BD139 wont work in VHF freqvency,it is not made for that,for vhf…2n3553,BFW16..17,2n3632…and many more but BD 139 is not suitable for FM transmitters
没错！
该巡回赛不是我的，它是从其他一些站点中转介的……但是最原始作者声称已经对其进行了测试，并用图像和视频证明了它。
您是对的，在YouTube上找到了一个……据我所知。.BD139最多可使用50 MHz，用于AF，短波发射机和更多字段，而不是VHF，但我找到了一个具有190 MHz过渡频率的数据表，而另一个则是另一个。有80 MHz TF（不同的公司）。找不到频率/增益图。
yes, BD139 looks more suitable for audio amps not for VHF or UHF FM applications, thanks for updating the info.
BD139在FM上运作良好
switching frequency of BD139 is 250 MHz
could i get more power from either a 2n3866 as pa transistor or a pair of them in parallel with the pa supply voltage separated and taken up to a 24v or 30 v dc rail . heat sinks and 0.5 ohm resistors on the emitters of the paired 2n3866,s
我认为并行输出晶体管无法帮助增加功率……。没有修改电路中的其他元素
BD139 100 Mhz amplification?
I would think that this 1.5 watt TX would not be stable. It could have the authorities knocking on the door as it drifts up the band.
它需要晶体控制才能保持频率。
The Bd139 type transistor may run at the operating frequency and lots of others at the same time. there seems very little bandpass tuning. having to rely on the accuracy of hand wound coils with no tuning slugs.
Bd 139 my work fine on top band, but it would not be my choice above 30mhz
Thank you for your useful suggestions, appreciate it!