Icom 7610 and 705 AM review...

Discussion in 'Amplitude Modulation' started by N2DTS, Oct 5, 2021.

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  1. N2DTS

    N2DTS Ham Member QRZ Page

    What do you mean they work really well on AM?
    You mean they manage to transmit low power AM with restricted bandwidth and limited fidelity?
    All the modern radio do that, and the Kenwoods sound much better at it and always have.
    Some Yeasu's do better (out to 4000 Hz audio), but lets face it, the AM radio in your car has much better fidelity then any modern
    ham radio rig transmits, AM broadcast is about 20 to 10,000 Hz I think, and short wave broadcast goes out to 5000 Hz or more which makes 100 to 2900 Hz of the Icoms seem a bit silly for good AM.
    Essb sounds better then the Icom's on AM.

    There are a number of reasons some hams like AM:

    Vintage gear, its fun and easy to work on, and it used to be dirt cheap used, it looks cool, etc,
    Tube audio and hifi tube design fun,
    The fidelity of a full quieting carrier and full shack filling audio,
    The ability to build your entire station and get good performance.
    The fun of restoring and/or modifying gear to make it work better then new.

    And, yes, you can run ssb on the old gear if you put ssb into it.
    Many rigs had that provision, and also did CW and RTTY.




     
  2. K9UR

    K9UR Subscriber QRZ Page

    My Viking didn't do SSB. neither did the neighbor's KW-1............

    As for fidelity, amateur radio was never intended to sound like broadcast quality. With limited spectrum, we certainly don't need 6 khz wide signals...let alone those that run 9 or 10 khz or we will be out of space.

    AM is a fun mode. But it isn't the end all of ham radio by any stretch. And yes, low level carrier AM, just like the DX60 and Ranger...sounds pretty darn good out of an Icom (or Kenwood or Yaesu or Flex or Elecraft).

    Dont worry...uou'll get a few bucks for scrap when it's time to send that big iron to the bottom of the sea or to the junk yard. This old buzzard is happoly old buzzard trolling ya back !

    Over !!! (PS...do you hang with HLR ? )
     
  3. W2VW

    W2VW Ham Member QRZ Page

    How does it work on 10 and 15 meters?
     
  4. N2DTS

    N2DTS Ham Member QRZ Page

    Last night, the top end of 40 was empty, 80 meters was empty before 6pm and after 9:30 pm.
    One ssb station was heard on 160, nothing on 15, 10 or 6 meters.

    If a contest is not going on, there is often nothing but room, so the need for super narrow signals is false.
    The active ham population is decreasing rapidly but still people call for narrower signals.

    Almost all the AM signals are 10 KHz wide and have been for the last 40 years I have been on.
    Only the modern ham rigs are 6 KHz.


    And yes, you posted the class D stuff but it only went up to 40 meters, you said it went to 6 meters or were you just talking trash?
    I would like to see your 6 meter class D legal limit rig as I think it would be a first.
    I am unaware anyone has gotten past 40 meters so far.

    I expect my equipment will all go to the landfill after I crap out, its all homebrew and no one wants that sort of stuff.
    I do not think I will care.

    It is interesting how many people have no idea what AM is about, they hear it on their modern radios with restricted
    audio and think it sounds good. It sounds a lot better then they know.




     
  5. K9UR

    K9UR Subscriber QRZ Page

    Where I live, we get all the AM guys bunched up in the window... 3873, 3880, 3885, 3890 The heterodynes are obnoxous with the chicago crew, the mid south crew, the new york crew and occasionally the texas crew all competing in a narrow space... so ya, 6khz makes a lot of sense ...
    7290 and 7295 is the only place i've ever heard consitent AM on 40M in the past 2 solar cycles
    20M is too crowded for AM...slop buckets galore
    15M.... just starting to open this cycle...never made an AM QSO on 15 in the last 35 years.
    10M...a narrow window 29.2 but again, almost no AM activity
    6M Zilch, nada, zero AMers here

    As to Class D -- all those pallets are capable of AM --even up to 6M. But who would bother. Aside efficiency is poor. The commerial class D stuff is 160-80-40 and there's a good reason...see above ... economics of it don't make sense when there's no one to talk to. Better off using a heathkit lunchbox for the one QSO per life that you'll make on 15M AM.... ....
     
  6. W2VW

    W2VW Ham Member QRZ Page

    Stop listening to drum solos at 140 dBA or move the rig : )
     
  7. W2VW

    W2VW Ham Member QRZ Page

    Norm W1ITT has a switchmode rig on 10 meter AM for at least 8 years.
     
  8. K9UR

    K9UR Subscriber QRZ Page

    The icom 7610 and solid state amp work great there....
    Class D ... stays on 40-80-160
     
  9. N2DTS

    N2DTS Ham Member QRZ Page

    Here on the East coast, there is activity all over the bands, but mostly in the area's you mention.
    There are AM nets in other spots, 3845 I think for the antique wireless net, there is some activity on 20 meters, 40 meters is 7280 and up dodging the
    sw broadcast.
    Many have moved to 3715 or 3705 if the licence class permits to get away from some of the rifraf in the 'window', some run
    very high power there and 10 KHz audio, plus rant about political stuff.
    Typical old guy 'the world is going to hell' stuff.
    There is a regular 6 meter AM net I hear, up North I think, and there was a 6 meter AM repeater over Philadelphia the broadcast guys
    used, I am unsure if its still there and used...

    I find the 'windows' useful for finding AM, you don't have to look or tune the entire band looking for an AM signal.
    I also find it useful to have the ssb stuff elsewhere most times.

    I will point out, no one cares what you use to get on AM, or what you sound like on it.
    I LIKE restricted audio like what the 7610 does even if its a bit too narrow, as it helps with my hearing problem.
    But most AM guys with good hearing will say it sounds like a cheap telephone, and it does.

    I think 4000 Hz audio is the sweet spot, not too wide but enough high end to pass the sibilance.
    Many Kenwoods do that, and a few Yaesu radios with software hacks/updates.

    I am tending to like bad audio, as it often comes from some man pack radio running off a dynamotor, or a stock Globe king, or BC610
    (the radio that won the war) as that gives you something interesting to talk about.

    In a world of broadcast transmitters, class d and e stuff, and perfect sdr audio, an old radio stands out!




     
  10. K9UR

    K9UR Subscriber QRZ Page

    You're right. Back in the mid 1980... there was SPAM.... lots of SPAM.... every QST had SPAM.... not much SPAM now days...
    Not much AM now days... a little bit. A few morning round tables...a few nets. It's pretty click-ish with the same old buzzards talking to the same
    old buzzards on their same window QRG... repeating "what I'm runnin here charlie"...for the past 40 years... same transmitter, same receiver, same doublet antenna....

    Doesn't matter what you use to get on AM (even the funny Drake TR7 with it's approach to AM)... it all works.
    The boat anchor world is hanging on but in decline.

    I hear more plastic radios on the air today than ever before and it's increasingly the "way"...and it probably should be -- few younger hams know a triode from a tetrode tube, an 813 from a 807 or have any clue about plate mod vs grid modulation techniques.

    I am actually surprised but a lot of the "rebel CBer" types know more than most newer hams about running high power AM mode (is that a Tram D201) ?
     

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