大致翻译一下 大家看看对不对
i tested and adjusted new cwaf board. there was necessary to do some changes, especially in cwosc part. tune osc doesn´t work with my 150mh inductors (very low q)....i will change them with better one (will order somewhere).
om3的问题 他的电感不行 造成2tone不震荡
so please do next changes:
1. af part - is working very good, only one change : r88 from 22k to 18k to have the same level with cw filter (maximum is on 580hz, fo rme it is ok) compare to ssb filter.
af窄带音频滤波器的更改 参数我们也要改 他的cw是500hz 我们的cw有三个滤波器 根据个人的最大带宽算
2. tune part - doesn´t work, i must change l1,l2.
还是2tone 电感的质量问题
3. cw osc: - change q8 with irlml5203 or similar fet, it is no more hot (30min.keying test), no more changes in keying circuit
- replace r20 (100r) with diode 1n4148 (cathode down to d2), otherwise during tuning abt. 10v is present on +12cw (going thru q8 up from drain to source).
以上是关于q8发热的问题 我建议大家根据ydo的参数改 经过验证可用
- remove c2 (10n) to prevent q1 oscillation !!!..
去掉c2 改善q1的震荡
- cy capacitor is 33 pf, i have c31 3-10pf to reach exactly 9 mhz (your xtal is different compare to george´s, so more changes is necessary to do
这个问题不大 lulu给的电容是大p数 大范围调整的可调 具体以后测试再说 因为每个人的cw中心频点都不一样
- check q3 current, should be cca 8ma,
- change c5 from 10pf to 47pf
- change r18 from 15k to 8k2 to have q2 cca 4ma current
- change r15 from 6k8 to 18k to have q1 current cca 6ma
- use r40 and r41 resistors 470r
- use 12r for r39 (2db attenuator 50ohm)
以上的建议改 om3lz 对比原设计的换了管子 所以更改以上参数 调整晶体管的工作状态点
- l1/l2 use primary 18,5uh plus 10pf capacitor. i have local toroid with 22 turns of primary, 6 turns of secondary; add parallel capacitor cca 120 pf ( plus minus) to secondary part from bottom side of pcb to reach sinusoidal waveform at the output. output level on 50 ohm load impedance should be -2 to 0 dbm.
这个就是nbg曾经提出来的选频回路的lc震荡频率的问题 建议拖后解决 根据个人实际调整出来cw滤波器的中心频点而定