LRN Precision announces LD-11 QRP Transceiver
LRN公司新款QRP收发信机 LD-11 上市
LRN Precision
LD-11 Transceiver
Others state “extra”, We INCLUDE as STANDARD
The HOTTEST new QRP Multimode HF+6M Transceiver on the market.
160M to 6M coverage!
市场上最热的多模式HF+6M的QRP收发信机，覆盖160米到6米
AM/FM modes!
AM/FM模式
BUILT-IN PANADAPTER!
60M and 11m CB band in some conditions!
可以60米和11米CB段
The new LD-11is Digital Direct Conversion, SDR type, build-in CPU (SM32a) DSP radio in which RF signals are directly converted to a digital data via differential and balanced A/D converters. This enables direct sampling with extremely low phase and floor noise.
新LD-11采用数字直接转换，SDR类型，内置CPU(SM32a)数字信号处理器，射频信号通过差分和平衡A / D转换器直接转换为数字信号。这使得可以用极低的相位和底噪进行直接采样。
The DSP is unique and features two independent channels. It also employs a unique differential algorithm within the software which is applied for IQ processing of the channels with phase suppression of the unwanted side-band channel.
数字信号处理器是独一无二的，它有两个独立通道。它也拥有一个在软件里的独特的差分算法，应用在IQ信号处理不需要的边带通道相位抑制上。
IQ信号是什么？
补充阅读：
The balanced ADC and DAC gives additional noise floor reduction and the receiver can handle interfering signals that are 100 dB stronger than the desired signal at a frequency separation of 10 kHz, and is about 130 dB stronger at 50 kHz separation.
已调平衡的ADC和DAC提供额外的底噪减低，接收机可以处理干扰信号，比所需的信号在10 kHz分离度的频率强100分贝，大约在50kHz分离度上强130 dB。
ADC和DAC是什么？
补充阅读：
随着现代科学技术的迅猛发展,特别是数字系统已广泛应用于各种学科领域及日常生活,微型计算机就是一个典型的数学系统。但是数字系统只能对输入的数字信号进行处理,其输出信号也是数字信号。而在工业检测控制和生活中的许多物理量都是连续变化的模拟量,如温度、压力、流量、速度等,这些模拟量可以通过传感器或换能器变成与之对应的电压、电流或频率等电模拟量。为了实现数字系统对这些电模拟量进行检测、运算和控制,就需要一个模拟量与数字量之间的相互转换的过程。即常常需要将模拟量转换成数字量,简称为AD转换,完成这种转换的电路称为模数转换器(Analog to Digital Converter) ,简称ADC;或将数字量转换成模拟量,简称DA转换,完成这种转换的电路称为数模转换器(Digital to Analog Converter) ,简称DAC
ADC和DAC基本原理及特点
模数转换器(ADC)的基本原理
模拟信号转换为数字信号,一般分为四个步骤进行,即取样、保持、量化和编码。前两个步骤在取样-保持电路中完成,后两步骤则在ADC中完成。数模转换器(DAC)的基本原理
DAC的内部电路构成无太大差异,一般按输出是电流还是电压、能否作乘法运算等进行分类。大多数DAC由电阻阵列和n个电流开关(或电压开关)构成。按数字输入值切换开关,产生比例于输入的电流(或电压) 。此外,也有为了改善精度而把恒流源放入器件内部的。DAC分为电压型和电流型两大类,电压型DAC有权电阻网络、T型电阻网络和树形开关网络等;电流型DAC有权电流型电阻网络和倒T型电阻网络等。As the receiver and transmitter are using the same DSP channel, there is no gap between the receiver performance and the transmitter performance. Thus, there is a clean neighborhood on the bands. At the development stage, our intentions were motivated by the TX side-band noise of existing SDR manufacturers, so our aim was to fully equalize our transmitter to have noise performance that is compatible with the best modern receivers, or even better. After a arduous year of development , we think we achieved it!
接收机和发射机使用同一个DSP频道并没有使得它们在性能表现上有差异。因此，各频道在任意波段上都很干净。在开发阶段，我们的意图是出于现有的SDR的制造商的设备在发射边带的噪音无法解决的问题，所以我们的目的是我们的发射机在噪声性能表现上完全平衡，能够被称为最好的现代接收器，至少是比较好的收发信机。经过艰苦的一年的研发，我们认为我们实现了!
This 11+ band radio is based on the LD-5, which has proven to be one of the most exciting QRP transceivers introduced in the last few years. Quite frankly, the performance rivals high end units offered by other manufactures at a much lower price point. Our motto is that we make QRP transceivers that you will want to take out in the field (without fear of breaking the bank).
这款11+波段的电台是基于LD-5设计的，这证明是近些年来最令人兴奋的QRP收发信机之一。相当坦率的说，其他竞争对手会以更低的价格生产提供性能高端单元。我们的座右铭是在您将想要的领域做QRP收发器而不用担心银行卡被刷爆。
Transmitter
发射机部分参数
Input Power:
输入电压
11.5-14.8 VDC（直流） Output Power:
输出功率
5 – 8W Measurement:
测量显示
SWR and Power:Numbers or Bar indicators on display
驻波和功率：数字或柱状图显示
Supply Voltage:Real voltage on display
供给电压：真实电压显示
Two Modes CW:
CW双模式
Select Straight Key or Paddle (built-in Iambic)
选择手键或自动键
Receiver
接收机部分参数
Receive sensitivity:
接收灵敏度
0.15uV w/o preamp
前置放大
Ant Preamp:
天线前置放大
+16 dB Spurious Response Rejection:
杂散响应抑制
IMD3 -48Db/ 5W IMD5 -43dB ATT: -12db Specifications:
规格说明：
Frequency Range:
频率范围
1800 kHz – 29.990 MHz HF +50-54MHz
160, 80, 60, 40, 30, 20, 17 and 15, 12, (11), 10, & 6 meter all mode operationModes:
模式
USB, LSB, CW, CW-R, DIGITAL DATA:CAT –USB jack : CW, PSK, RTTY, SSTV – 3.5mm jack PAN mode:
PAN模式
Easy to Find quiet port +/- 24kHz from main frequency. Power:
功率
5W output in CW / SSB Frequency Stability:
频率稳定度
+/- 3 ppm (Si570 defined) typical over 0-50 deg C Supply Voltage:
输出电压
10.5V min to 15V max 350mA receive and 1.5 to 2A typical in transmit LO temp. Stability:
低温稳定度
+/- 2.5 Antenna:
天线
50 ohms BNC Dual VFO
双VFO
Memory:
存储
100 memory storage per band Memorize frequency, mode, VFO’s Built-in speaker:
内置喇叭
8 ohms, .5 watts Dimensions:
尺寸
4.724”L X 3.937”W x 1.957“H Weight:
重量
19oz/0.54k/excl. mic. Iambic key:
抑制键
Mode A and Mode B Pitch CW: Controls CW offset. The sidetone pitch is automatically set to equal the offset Notch Filter:
陷波器
Automatic Heterodyne filter for SSB from -6 to -40 db Noise reduction:
降噪
Level of attenuation of the noise from 1 to 50- use minimal necessary Noise Blanker:
消噪
Adjusted in the range from value 4 to 12 readings depending on interference CW VOX:
CW 控制
Break in delay in CW – adjustable from 0.1 seconds to 5 seconds CW memory keyer
CW记忆键
Choose Iambic Mode A or B VOICE VOX
声控
VOX Delay adjustable from 0.1 seconds to 5 seconds SSB VOX Level:
SSB声控等级
VOX GAIN 10-100 10 IS MOST SENSITIVE SSB EQ 3 band Bass, treble, middle audio boost on transmit – up to environment 8 Different filters (incl):
8个不同的滤波器
4 of 4 for CW/ SSB – 1-3 factory presets – No.4 adjustable for CW/50-1000Hz/ and SSB/250-3.6KHz Compressor SSB:
SSB压缩
0-20dB SSB TX MUTE
SSB发射静音
Enable= no monitor Disable= monitor No QSK
发射延迟
Maximum switching delay is 12mS and digital delay is 47mS Please note that when you purchase this unit, you read the manual very carefully. Take special care to use only approved connectors, proper antennas, 50ohms dummy loads and carefully check voltage and polarity of your 12VDC power supply or battery. Check all buttons and inspect after delivery. Once you verify reception and SWR, then plug in your mic and other accessories. All 3.5mm jacks are stereo jacks.
当你选购本产品，请仔细阅读产品说明书。特别注意要使用允许的接线，天线，50欧的假负载，并仔细检查电压。如果使用12V直流供电，注意极性。当你有收到信号和驻波反馈时候，插上你的手咪和其他配件，所有的3.5MM接口都是立体声接口。
1 Year Factory Warranty
一年工厂质保
Price $774.99
价格：774.99美金
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