CW-фильтр в FT-817

Друзья, приветствую!
Сегодня приобрёл "инрадовский" телеграфный фильтр на 300 Гц для своего "малыша". Поставил. Активировал в 38 меню. Но одно но: фильтр-то телеграфный, а активируется в режиме SSB. Объясню: в меню № 38 три положения - OFF, SSB и CW. Так вот в режимах OFF и SSB он не работает (то же звучание эфира как и без него), а вот когда включаешь режим SSB, то всё становится нормально - звучание именно 300-герцовое. По идее должен всё-таки включатся при переходе в CW (в меню 38), ан нет! Может кто-нибудь объяснить, почему так? Главное, что он работает - и это главное! Но всё-таки хочется узнать, почему не много не так, как должно быть...

Добавлено через 9 минут
Забыл добавить-в режиме SSB он тоже "вырезает"!

5. You can go ahead and put the top panel and shoulder strap brackets back on and turn the rig back on. Press the "F" key and hold it for half a second to take you into menu mode. Turn the SEL dial until you get to menu #38. It should say "OP FILTER" and "OFF" just above that. Rotate the main tuning dial until you see "CW" (not "OFF" or "SSB"). Important note - as you go through the "SSB" choice, you will notice that the rig switches to the newly installed CW filter - DON'T PANIC, all is okay. This threw me for a while until I understood what was going on. Make sure that menu #38 is set to "CW" (ignore what the receiver actually does!) and then press the "F" key for half a second again to exit menu mode.

6. You're almost done. You will probably panic at this time (as I did!) because as you switch through the modes from USB/LSB/CW/CWR etc., the rig seems to be stuck in SSB filter mode. There's one more thing you have to do to get the CW filter working. Check out page 14 of your FT-817 Operating Manual - number 7 at the bottom right of the page you will see the "C-Key" setting for "NAR". You have to set this in order for the receiver to switch to the narrow CW filter when you switch the rig to CW or CWR modes. To do this, first put the rig into CW or CWR mode then tap the "F" key once quickly. The FUNC Keys menu items for the A/B/C pushbuttons should appear. Rotate the SEL control until you see "IPO ATT NAR" over the A/B/C buttons. Then press the "C' pushbutton once to set the filter to Narrow. A small right-pointing arrow should appear and the rig should switch to the CW filter - you should hear a marked difference in the receiver noise "tone".

7. That's it. You can swap between the SSB and CW filters anytime by revisiting the FUNC Key menu and toggling the NAR function.



Yaesu FT-817 CW Filter Installation

By Dave Fifield, AD6A
Original 1/19/01
Updated 4/18/01