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My AM tuner stops every 9Khz and I can't tune in station - anyone know why?

75.161.154.162
Posted on October 27, 2009 at 08:48:09
Cut-Throat
Audiophile

Posts: 6895
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
 I wanted to tune in a AM radio Station at 950 khz - My digital tuner stops at 945 khz and then 954 khz. I can hear the station at 945 khz, but it should work better at 950khz.

I looked in the manual for the tuner and it said that the AM stops every 9khz - But it didn't say why.

Anyone know?

Cut-Throat
RE: My AM tuner stops every 9Khz and I can't tune in station - anyone know why?, posted on October 28, 2009 at 11:57:30
Marantzguy
Audiophile

Posts: 2411
Joined: June 21, 2002
 Hi, Cut-Throat:

I hope you manage to resolve the problem(s) you have reported relative to receiving AM stations.

I own a couple of 1950's "hi-fi" AM only tuners. One of these is a Fisher AM-80 (I seem to remember) and for pulling in AM stations, it is hard to beat. I have not used it in many years now, but when I did, it was quite possible to record off the air with good results, as it offered a wide-band and narrow-band option. The trick is to kill heterdynes and whistles if you can, with filters. The tuner went up to 10K in frequency response, which I believe, is pretty much the upper limit for AM.

The other tuner is one made by EICO in the late fifties. That one, also, is a good performer, generally-speaking.

Now, if you really want to experience some of the best AM reception possible, there are those fancy mega-buck receivers manufactured in the thirties and forties by E.H. Scott!

Or...how about a McMurdo-Silver Masterpiece VI? (see link below for a thrill)

Lust!

A good tabletop rotational box-frame loop antenna will allow you to null out "co-channel" interference effectively.

Richard Links
Berkeley, CA

Isn't channel spacing different in Europe?, posted on October 27, 2009 at 09:51:50
4season
Audiophile

Posts: 1680
Location: Colorado, USA
Joined: April 2, 2002
 Thinking you got an overseas model, and if you are lucky, there's a switch or internal jumper to set things right.

OK - problem solved - thanks !..........., posted on October 27, 2009 at 18:21:46
Cut-Throat
Audiophile

Posts: 6895
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
 OK - Problem Solved !!

I took the tuner out of the shelf (Not an easy deal) and sure enough on the back of the unit is a 9khz-10khz switch. Not documented in the manual and the picture of the real panel in the manual does not show this switch

But, I flipped the switch and I am now able to tune in the station.

Thanks for all the help !!

Cut-Throat
RE: Isn't channel spacing different in Europe?, posted on October 27, 2009 at 11:41:17
Cut-Throat
Audiophile

Posts: 6895
Location: Minneapolis - St.Paul Area
Joined: September 2, 2000
 I have no idea expect that the manual does mention the 9khz steps and nothing else. You can check the manual yourself, as it is on page 5 under MANUAL TUNING.

Here is the link to the small manual in PDF Format

Cut-Throat
RE: Isn't channel spacing different in Europe?, posted on November 4, 2009 at 18:27:54
FRG7SWL
Audiophile

Posts: 1197
Location: NorCali
Joined: March 26, 2003
 4Season is right about European medium wave spacing being different from North America's, CutThroat; 9 khz for Europe & 10 khz in the Americas. Portable digital shortwave radios from Grundig, Panasonic, Sangean/Realistic, & Sony, amongst others, usually provide access to either 9 khz or 10 khz medium wave spacing. Analog European f.m. transmissions are 25 micro-second de-emphasis, whilst American analog f.m. utilizes 75 micro-second de-emphasis. Hey Marantzguy, your Sony ICF-2010's f.m. band should extend down to 76 Mhz, the Japanese f.m. band.

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