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eHam Forums => Mobile Ham => Topic started by: KJ4SKP on December 28, 2012, 04:24:18 PM



Title: Yaesu 8900 AM mode
Post by: KJ4SKP on December 28, 2012, 04:24:18 PM
I thought the 8900 was an fm only radio. I saw in the menu an option to turn AM on/off.  What will that AM option do for my 10 m operation?


Title: RE: Yaesu 8900 AM mode
Post by: KJ4SKP on December 28, 2012, 04:46:58 PM
When I hear 10m activity it is usually quite (garbled). With this radio am I unable to RX/TXvoice clearly?


Title: RE: Yaesu 8900 AM mode
Post by: KCJ9091 on December 28, 2012, 05:10:34 PM
Allow you to receive airband.


Title: RE: Yaesu 8900 AM mode
Post by: KJ4SKP on December 28, 2012, 06:24:51 PM
I guess my question is should I be able to tx/RX on 10m with my CR 8900 antenna clearly using only voice communication? Or will the FM only mode of the ft 8900 not allow me to do so on 10m?


Title: RE: Yaesu 8900 AM mode
Post by: KCJ9091 on December 28, 2012, 07:43:40 PM
The 8900 will only transmit FM on any of the four bands.


Title: RE: Yaesu 8900 AM mode
Post by: KJ4SKP on December 28, 2012, 07:57:51 PM
Thanks Jerry. Clearly I am new to ham radio. I'm not sure I understand your answer. I'm pretty unclear about the different modes.  So just to be clear the fm operation of my radio will not allow me to communicate on 10m using voice?


Title: RE: Yaesu 8900 AM mode
Post by: KB2VUQ on December 28, 2012, 08:59:26 PM
You can use fm voice on the 29 mhz repeater pairs and simplex frequencies.
The most common fm simplex frequency is 29.600

You cannot do ssb (usb) phone, which is more prevalent in the 28.300 to
28.500 range. 

As the other OM stated, your 8900 will always transmit fm. Switching between
fm/am modes is for the receiver only. Generally, only the aircraft and citizens
bands are the 2 bands that use am.


Title: RE: Yaesu 8900 AM mode
Post by: KCJ9091 on December 28, 2012, 09:05:09 PM
For a technician class the 8900 cannot be used on 10.  A general can use it on the FM portion as the prior poster said.


Title: RE: Yaesu 8900 AM mode
Post by: WE7H on December 28, 2012, 09:18:52 PM
Howdy,

On your 8900 you can work FM voice on all the 4 ham bands it's made for.  I believe that's the only emission mode the rig has for transmitting.  Your rig also has receive frequency ranges that include 108-180 and 320-480 MHz.  Like KCJ9091 said, these segments include VHF and UHF Air Band frequencies.  The air band users transmit in the AM mode.  Aircraft, airfield operations, Air traffic control, etc.  The AM mode on your 8900 will allow you to monitor those transmissions as long as they are not encrypted.  If you have an airport or Air Force Base/military airflied nearby that can be some interesting monitoring.  If you set menu item 46 for auto, when you dial up air band freqs, the radio will go into AM mode automatically for you.  As for the ham bands, the 8900 is made to work FM only.  If the garbled 10M stuff you are hearing is at the lower end of 10 meters, say down around 28.300-28.600 MHz, it's most likely SSB activity which the 8900 won't demod properly.  You'll want to hunt for FM action up in the 29.500-29.700 MHz area. Your ticket will let you do that.

Nice rig.  Hope that helps.

73, WE7H


Title: RE: Yaesu 8900 AM mode
Post by: KJ4SKP on December 29, 2012, 06:27:51 AM
Thanks WE7H.  That make sense my feeble mind can grasp. 


Title: RE: Yaesu 8900 AM mode
Post by: WE7H on December 29, 2012, 10:08:19 AM
KJ4SKP...you are quite welcome Sir.  Always glad to try and be helpful.

73, WE7H


Title: RE: Yaesu 8900 AM mode
Post by: N6AJR on January 12, 2013, 03:14:39 PM
I used to have an old multiband mobile, which had the weather channel on it. some how I got the radio on to AM for the weather and did not switch back to fm.  I thought I had broke it.


Title: RE: Yaesu 8900 AM mode
Post by: KJ4OBR on January 17, 2013, 08:17:27 AM

http://www.arrl.org/band-plan (http://www.arrl.org/band-plan) has information on what is where in the bands. I have an 8900 and have made contacts into eastern Europe and South America from North Carolina when conditions were right. Unfortunately, there is more activity on SSB most days even when the band is open. Unless you have a 10m repeater in your neighborhood, you can't sit and wait to hear people, get on 29.600 and start calling CQ you might be surprised who answers.

73
Dave

Thanks WE7H.  That make sense my feeble mind can grasp. 


Title: RE: Yaesu 8900 AM mode
Post by: KJ4SKP on January 21, 2013, 04:29:40 PM
Hey kj4obr

Just curious which antenna you were using w/ your 8900 when you made those S american and European contacts?




http://www.arrl.org/band-plan (http://www.arrl.org/band-plan) has information on what is where in the bands. I have an 8900 and have made contacts into eastern Europe and South America from North Carolina when conditions were right. Unfortunately, there is more activity on SSB most days even when the band is open. Unless you have a 10m repeater in your neighborhood, you can't sit and wait to hear people, get on 29.600 and start calling CQ you might be surprised who answers.

73
Dave

Thanks WE7H.  That make sense my feeble mind can grasp. 


Title: RE: Yaesu 8900 AM mode
Post by: KJ4OBR on January 22, 2013, 11:02:05 AM

I'm running a Larsen NMO27 shortened slightly for 10 meters, and a Maldol EX-510b NMO for 2, 6, and 440 through a Comet CF-360f diplexer. The 2 antennas perform reasonably well, and they just fit in the garage.

73
Dave



Hey kj4obr

Just curious which antenna you were using w/ your 8900 when you made those S american and European contacts?




http://www.arrl.org/band-plan (http://www.arrl.org/band-plan) has information on what is where in the bands. I have an 8900 and have made contacts into eastern Europe and South America from North Carolina when conditions were right. Unfortunately, there is more activity on SSB most days even when the band is open. Unless you have a 10m repeater in your neighborhood, you can't sit and wait to hear people, get on 29.600 and start calling CQ you might be surprised who answers.

73
Dave

Thanks WE7H.  That make sense my feeble mind can grasp. 


Title: RE: Yaesu 8900 AM mode
Post by: KJ4SKP on January 23, 2013, 06:29:52 PM
Thanks Dave, sounds like a great antenna set up.


Title: RE: Yaesu 8900 AM mode
Post by: KJ4OBR on January 25, 2013, 05:49:20 AM
Thanks, The Maldol is a compromise antenna but performs well at 2/440. On 6m it is just OK. I'm going to try adding another diplexer to split out 2 and 6 from 440 and swap the Maldol for a Larsen NMO50 5/8ths wave 2m which loads very nicely as a 1/4 wave 6 meter antenna. I just need to punch a hole on the roof of the Jeep for the 440 whip when things warm up and I can find the time.

73
Dave

Thanks Dave, sounds like a great antenna set up.


Title: RE: Yaesu 8900 AM mode
Post by: KC2VQG on June 28, 2013, 07:52:46 AM
For a technician class the 8900 cannot be used on 10.  A general can use it on the FM portion as the prior poster said.

Correction: "may" vs "can" and "may not" vs "can not"


Title: RE: Yaesu 8900 AM mode
Post by: K3GM on June 30, 2013, 01:17:28 PM
The way I have my FT-8900 set up is as follows.  Coming out of the radio I go into a Diamond MX-610 "diplexer".  The diplexer has one input and two outputs.  One one of the outputs goes to an tri-band antenna which provides 6m, 2m, and 70cm.  The other output goes to a 10m antenna, in this case a Larsen NMO27.  As the previous poster indicates, you can put whatever antenna you desire on the output of the diplexer provided it is designed for the band you wish to operate in.

There is also a way to run 4 separate antennas with a readily available diplexer and triplexer. It is as follows:

-Output of the FT-8900 and run it to the input of a Diamond MX-610 Diplexer.
This has 2 outputs, 1.3-30MHz and 49-470MHz. Attach your 10m antenna to this
port.

-Attach the 49-470MHz port of the MX-610 to a Comet CFX-514J Triplexer. This
triplexer has outputs for 6m,2m, and 70cm.  It's very important to purchase the "J" suffix as
the outputs of this triplexer are SO-239's so you can plug the PL-259's from the
antenna mounts directly into the triplexer eliminating any lossy gender
changers. The only jumper you'll need is from the FT-8900 to the input of the MX-610.


Title: RE: Yaesu 8900 AM mode
Post by: KA7RRA on July 16, 2013, 02:36:52 AM
had the 8900 had side and on it, I would have bought one in a heart beat