这几天一直在和iw3fzq通email,他偶然发现了我放在youtube上的th-300 pro的视频,就来信询问是什么qrp设备?我给他详细介绍了一下并发了几张照片过去,他非常赞赏th-300 pro。enrico本身也是个qrp兼diy的高手,他自己diy了很多微波的transverter,前置放大器和滤波器。他对th-300的看法如下:
hi zhang,
i seen the photos you have sent. the th-300 seems very well done. i like the 6 crystals i.f. filter. usually, all qrp rigs use 4 crystals instead of 6 in the i.f. chain!
one particular, the low number of semiconductors (transistor/fet, i.c., etcetera). i seen it works on ssb too. very good job! which is your opinion about bd6ra's rig?
bc overload on 40 mtrs? filter selectvity on cw and ssb mode?
if you look my youtube's pages, you can find my videos with many qrp transceivers....
if you have time, it is a good idea make new videos with th-300 !!
-----------
zhang,
now i seen well the pcb, lots of semiconductors are located in the back of pcb!
awesome, smd transistors for qrp homemade rig.
i used lot of smd transistors during my microvawe transverter assembly.
about the i.f. cw filter, i believe 600-800 hz are sufficient for usual cw qsos.
during the primary contest, also using a commercial rig there will problem...
i think it is a good way for a single conversion qrp kit, no more.
i wait you finished your work about th-300 and successively to look your new videos!
congratulations again....
73 de enrico, iw3fzq