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icom 751 vs icom 751a

Discussion in 'Amateur Radio Equipment Reviews' started by VA3DPR, Apr 2, 2008.

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  1. VA3DPR

    VA3DPR Ham Member QRZ Page

    Have a friend who as the ic 751 and i have the ic 751a. Curious what one is the better rig.
    thank you
     
  2. KI4TWB

    KI4TWB Ham Member QRZ Page

    I understand that there were several problems with the 751 that were fixed with the 751-A. Having said that, I have an old 751 and enjoy it very much.
     
  3. KG6WCA

    KG6WCA Ham Member QRZ Page

    I have a 751 and its been good. Use it mainly as receiver as I'm still a tech. The main difference I've heard between the two was that the 751A came standard with a cw and I believe a ssb filter.

    Randy
     
  4. WB0OAF

    WB0OAF Ham Member QRZ Page

    ICOM 751A Comparison

    Here's a Reprint of the Comparisons!


    The IC-751 and IC-751A are very different in a number of ways. There was a major redesign of the RF, IF and control boards in the transition from the IC-751 to the iC-751A. This brought about a significant improvement in the reliability of the 751A as compared to the 751.

    If you have a choice between the two, I would recommend that you go for the 751A rather than the 751.

    http://www.ab4oj.com/icom/oldicom.html

    There are 3 versions of the 751A:
    1) Old logo/PBT, New logo/IF shift (easily modifiable to PBT)

    2) New logo/PBT (the final series prior to discontinuance in 1993.)

    Best 73, Adam VA7OJ/AB4OJ

    MORE INFO:
    1) The Main board was the biggest difference between the 751 and the 751A. The seperate FM board on the 751 was incoropated in the main board of the 751A.
    2) The intermediate frequencies were changed in the last IF stage from 350khz in the 751 to back to 9.011 Mhz. in the 751A this improved the passband and notch features.

    I think that Patent dispute over the Icom radios in 1989 only involved the 4 conversion Icom radios that had PBT the IC-751A and IC-761 at that time.

    The IC-735 being a Triple Conversion Radio used a different Passband Tuning articiture and was allowed to still have their PBT during that legal dispute. Other nice features were added to the 751A to make it a truelly fine cw rig the FL-32A filter was standard and the built in keyer was added to the IC-751A not the Curtis Iambic A but it was a Microprocessor based Iambic B keyer in my opinion a much nicer keyer than the addon keyer for the 740, 745 and 735 which was a Curtis Iambic A chip.

    The remake IK2RND keyer for those above mentioned Icom radios that MTS's Scott sells uses the same chip as was used in the IC-751A's resident Keyer uses. I looked it up in the IC-751A's Service Manual. I hope that further answer some questions.

    Happy 20th Birthday IC-751A introduced April '86 just before our Expo 86 in Vancouver BC started in May of 86. Everyone that volunteer operated that station VE7EXPO wanted to try out that new State of the ART IC-751A.

    I used the 735 and operated CW I did get a chance to work a couple SSB contacts on that shiny new 751A I still like that Radio a lot I own 2 new Logo versions with PBT.

    The OLD Icom 751A Receiver Dynamic Range is comparable to the ICOM 756 PRO and Above Models!

    It has no DSP, but the receiever being so sensitive and Quiet doesn't need DSP, just turn the NOTCH on, and Notch the Band noise all together and you have a Radio!
     
  5. VE3FST

    VE3FST Ham Member QRZ Page

    I use a complete Icom 751A station in my shack , it works amazing ! The receive is second to none , very quiet and transmit even with the handheld mic just seems to reach anyone . I use the rig itself with a set of HF whip antenna's that were $30. a piece or less and it talks everywhere without a problem . I was also told the 751A was redesigned to eliminate flaws in the first design I'd tell anyone to buy one of these......VE3FST
     
  6. N0SYA

    N0SYA Ham Member QRZ Page

    The 751a is legendary as to outstanding performance at hf, the 751 is legendary as a relative dog.
     
  7. PH5E

    PH5E Ham Member QRZ Page

  8. VK5MRD

    VK5MRD Ham Member QRZ Page

    Icom 751A

    Hi,

    I have owned my Icom 751A for many years and I am more than happy with the performance of this radio. It has never let me down and has been exceptionally reliable. I have a friend who owns the Icom 751 and I agree with the comments made above re the two radio`s. The standard HM-12 mic sounds excellent with punchy audio. I also use a SM-2 desk mic with mine and it is a very good combination. The 751a in my opinion lives up to its reputation.

    73 de VK5MRD
     
  9. W4QBQ

    W4QBQ Ham Member QRZ Page

  10. PH5E

    PH5E Ham Member QRZ Page

    Have you got anything to back this up?
    I am the first to admin accuracy is essential, but eham.net, rigpix.com and universal-radio.com all state the 751A does 100W.

    A user manual would be nice at this point, can anyone confirm either 100 or 200W?
     
  11. KA5S

    KA5S Subscriber QRZ Page

    I've had both. 100 watts. 200 watts INPUT, though.


    Cortland
    KA5S
     
  12. PH5E

    PH5E Ham Member QRZ Page

    I thought there might here been some misunderstanding of input/output/pep/etc; I get them mixed up from time to time myself. For now, I'll leave the 100W in my database.
     
  13. ve5ed

    ve5ed Ham Member

    From the manual regarding wattage of 751:
    SSB 200 watts input
    CW 200 watts input
    FM 200 watts input
    AM 40 watts output

    Hope this helps
     
  14. NL7ZM

    NL7ZM Ham Member QRZ Page

    751A power rating

    It's been a long time since this post but!!

    The 751A is rated 100watts output, and 200 watts input. This is per the operation manual.

    Gene
     
  15. NL7ZM

    NL7ZM Ham Member QRZ Page

    751A power

    My previous post is miss leading.

    The 751A has 200 watt input except on am. per the manual.

    It's output measured on it's own meter is around 120 watts for mine. I am sure this will vary with the device used, and the individual radio, to measure the power, Bird, etc.

    I set mine at or less than 100w on the internal meter.

    Sorry about the goof.

    Gene
     
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