Sangean ATS90, ATS909W Service Manual

Zusätzliche Informationen zum Sangean ATS909 / ATS909W
Wir haben hier interessante Infor m ation en und Tipps zum Weltempfänger Sange an

ATS-909 zusammengetragen. Viele Informationen sind in englischer Sprache.
An dieser Stelle herzlichen Dank an Dave Moisan, N1KGH, der eine sehr

interessante Site zum Thema betreibt. Diese Seite ist unter:

http://mysite.verizon.net/vze20h45/radio/sangean/909tech.html

zu erreichen und wird ständig erweitert.

Hier nun die „wichtigsten Tipps“. Achtung! Alle Modifikationen wurden nicht überprüft
und getestet. Deshalb: Alles auf IHR ALLEINIGES RISIKO!!!

How do I hook up an external antenna to it?

The radio accepts a 1/8" stereo headphone jack for its external antenna. It's wired a
little differently than you think.

The tip goes to the antenna terminal and the sleeve goes to ground, just as you
would expect in this unbalanced antenna input. Shortwave signals are routed from
the external antenna jack when a connector is plugged in.

The ring--the terminal in the middle of the plug--has a special purpose. When you
ground it, medium wave signals are also routed from the external jack instead of the
radio's internal loopstick. This is why some people have reported poor MW reception
when they use regular 1/8" mono patch cables to connect their antennas.

But for medium wave DXers, this is an opportunity to connect their favorite antennas
to the radio; the lack of a good MW antenna connection has made some otherwise
good radios less than desirable.

If you prefer to use the internal loopstick for MW, simply leave the ring of the plug
unconnected.

How do I disable the internal MW antenna?

Using a 1/8" stereo connector, ground the ring terminal to the sleeve. Or else use a
1/8" mono connector. The FAQ author much prefers the former method as this can
be controlled by a SPST switch to disable and reenable the internal antenna, thus
saving the antenna jack inside the radio from wear.

Does the 909 have birdies (spurio u s signals)?

Yes. The 909 has two strong birdies at 27.022 MHz and 27.472 MHz, and several
others at 17.865 and 18.165 MHz.

Are the station memories really permanent like the manual says?

No. The station memories can be changed.

• Pick the frequency you want to change.

• Enter the new frequency.

• Hit the M key.

• The display will say "MEMOFULL".

• Hold down the M key.

The new frequency should now be stored in memory.

How does the priority button work?

The priority function is not well explained in the manual, and it behaves differently
depending on what band is involved. On MW, LW and FM, the priority button has its
own memory location, so you can store a station to it like any other memory.

On SW, though, the priority button calls up an already existing station memory; it
does not store a station itself, but only the reference to a station in the memory
pages.

To set a priority station in MW, LW or FM bands:

Tune to the station you want. Hit the M key. Hit the PRIORITY key (that key that
looks like a "1" and an arrow.) That's it. When you next hit the PRIORITY k ey, the
station you stored will come up.

To set a priority station in the SW band:

First, the station you want to hear must already be stored. Find a empty page
(usually page 29) or overwrite a memory location and store your station there. Then
hit M and PRIORITY. As long as the station is stored in "regular" memory, the
PRIORITY key will call it up.

My radio locked up! How do I fix it?

On the bottom edge of the radio, to the right of the keypad, there is a small panel with
a hole marked "RESET"; insert a paperclip into the hole and release. The clock
display should reappear--you might need to reset it--and you should be able to turn
on the radio.

How do I adjust the LSB/USB offset?"

You should only need to adjust the BFO if it is noticeably out of adjustment.
The BFO can be adjusted as follows: The radio should be at normal room

temperature, not in the sun nor out in the cold. Let it sit there for about 30 minutes.

1. Tune to WWV or an equivalent frequency standard. If none is available at your
location, a local MW station will do.

2. Remove the plastic LCD cover with a thin metal or plastic object.

3. There are two adjustment pots under the display, they may be gray or orange.
The pot to adjust is TC301, on the right side.

4. Switch from LSB to AM to USB and compare the beat note. If you don't notice
a difference in the beat notes, don't bother changing it.

5. If the beat note is low on LSB, turn the pot slightly clockwise.

6. If the beat note is high on LSB, turn the pot slightly counterclockwise.

7. Repeat step #4 until the beat notes sound the same.

Note that TC302 adjusts the clock. If you find your SSB unchanged and your clock
very fast (or slow), you adjusted the wrong pot!

This is at best only a rough adjustment. You'll need a frequency counter and the
service manual if you want to do it right.