这个ham也有显示屏缺像素情况,另外还指出了一堆问题,不过,凭心而论,以857d这价格,机子算是不错的了。
ve3fax 评分: 3/5 nov 27, 2011 09:45 send this review to a friend
ok rig for the money-not great time owned: more than 12 months
so many 5/5 ratings?
3.5/5 is more suitable after really spending years using this rig. it's ok for the price, but certainly not a 5/5. here are the negatives that are missing from the reviews and a few common long-term problems:
display matrix loses pixels after a few years-making reading displayed characters difficult.
用了几年后,显示矩阵丢失像素,辨认字符困难。
rf transistor bias often mis-adjusted from factory and requires regular re-adjustment (drifting?). this causes alc/rf output instability, especially when reducing down for digital and qrp ops.
射频晶体管偏置经常从工厂出来就是失调的,需要重新调整(漂移?),这造成alc/rf不稳,特别是当减少功率进行数字模式和qrp操作时。
(often heard as squealing, fluttering et.) there is some internet info on dealing with this problem- check-out an italian technician's website.
high noise and artefacts while in xmit idle (and with audio input). there are mods to reduce this somewhat.
high swr fold-back does not seem to protect rig when running qrp, likely due to the bias instability problem mentioned above? cases of blown finals as a result. careful.
six metre oscillation and all band am mode distortion problems were common on some production batches. after repair by yaesu, my rig is now ok, although their tech did a terrible job aligning and setting-up carrier offset et.
in qso rcv, menu knobs and features can be mastered, but can be difficult. this is typical when rigs are made compact. computer control makes it easier, but not when mobile or working pile-ups et.
optional filters help very little. they do help with some close-in agc pumping, and use of menu driven if offset but knob/menu must be mastered to shift away from interfering signals. filter will help, but is it worth the price for "the casual operator" when considering over-all receiver quality? get the narrowest ssb filter possible!
ahh , now for the dsp. don't forget, it has audio dsp, not i.f.dsp. it works great for cw, and can be helpful for ssb, but don't expect miracles. noisy conditions can be improved to pull-out some signals. using if shift and dsp audio pass-band adjustment helps ssb, but a lot of twiddling is required with marginal usefulness. one thing for sure: the auto notch dsp is almost useless. needs an s-9 heterodyne to work! i find it sometimes works better filtering general qrn.
this rig(like others), can be effected by rf getting into power cable and control cables.
rf and power spikes have been known to change/corrupt menu settings.
receiver is "ok", but after trying to use it for a band-blasted arrl field-day, we broke down and went to my 1980's yaesu ft-102 hybrid rig instead. long-time hams were blown-away at the difference in front-ends and how amazingly better the ft-102 was for receiving. not a fair comparison, i know. but if your after a quality receiver for fair price, rather than all band ops., maybe consider an older high-end rig.
so, keep these things in mind should you have problems down the log or if you are expecting a 5/5 rig.
don't get me wrong! for the money and frequency agility, i would buy this rig again. i get excellent mobile report running hamstick type antennas. it's light-weight and easy to move from car to home to suitcase.
lots of computer control and digital in/output options that work well and interfaces can be easily homebrewed and work well.
having hf,6m, v/uhf in one rig is nice and after my repair for am distortion, even get good am reports.
so, over-all a neat little rig, but depending on the kind of operating, you may be slightly frustrated or disappointed. but comparing price based alternatives, its generally a good rig, but not worthy of a 5/5 !