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Diawa CN-801HP

Discussion in 'Ham Equipment' started by Captain Kilowatt, Mar 3, 2012.

  1. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    Anyone using the Diawa CN-801HP cross needle meter? I just ordered one and it should be here the first of the week. It is the 2Kw model. I thought about the 3 Kw model but will never run that much power and thought about the error percentage being based on full scale so figured the 2 Kw model would be better for my use. I have been so wound up getting things together for my modified Larcan television amp for 6m that I forgot all about the fact I have nothing to measure over 200 watts with except for some RF current meters. They would work but then I would have to know the exact load impedance and calculate power from the RF current and do it the hard way. Besides not too sure how the presence of an RF ammeter inline would affect the line impedance at 50 MHz.

    Anyway who has one and how do you like it? Is he peak reading function decent. I know there was an issue with the early models being inaccurate but that has supposedly been fixed.


     
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  2. Mr Clean

    Mr Clean Active Member

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    I run one and like it real well. I dont use the light real often because a friend has one and his burned out so I have a small gooseneck light on top of it. I know im lazy. You should be very happy with it.
     
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  3. sp5it

    sp5it Master of puppets

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    I'm using 801P. Nice, good working meter.
    Needs some mods.
    First mod is to change PEP circuit to be more reliable, second to see SWR in PEP mode.
    If you can't find that I will post those mods later.
    MIke
     
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  4. Robb

    Robb Yup

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    Have the info for these mods?
     
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  5. sp5it

    sp5it Master of puppets

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    PEP mod by ZL3AG:
    Mod to see SWR in PEP mode I'll post tomorrow, have to get that from my shack computer.
    MIke
     
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  6. Mudfoot

    Mudfoot Supporting Member

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    I like mine very much. Very easy to read and 20 watt scale is a plus. It is very heavy and resists falling back with weight of coax.

    Most owners whine because it won't show reflected power in PEP mode, no issue for me. My light still works, but I rarely use it.
     
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  7. JoeDirt

    JoeDirt Active Member

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    I like mine!
     
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  8. sp5it

    sp5it Master of puppets

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    PEP mod in the attachment.
    Mike
     

    Attached Files:

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  9. Captain Kilowatt

    Captain Kilowatt Professional Amateur Staff Member

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    Well today was my lucky day. I went to the post office and there waiting for me was my CN-801HP meter. It looks nice and is surprisingly heavy which is good as there is less chance of it moving from the cables dragging on it. Not only was that a lucky stroke, only three days from order to delivery from Toronto, my signature line also arrived today fresh back from the electron recyclers. Jessejamesdallas returned it but it was broken so I had it repaired. I think it looks much better now than before and it even has a fresh new color. (y)
     
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  10. Eastside

    Eastside Well-Known Member

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    I have one and it is accurate on dead key watts.....but mine does not register pep watts accurately.....hardy moves....really bummed me out for how much it cost. :(
     
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  11. Mr Clean

    Mr Clean Active Member

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    You do have it hooked to a power sorce dont you? Its true pep and needs a 12 volt supply to run it. I run mine off a 12 volt 1 amp supply. Only pulls 770ma.
     
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  12. Eastside

    Eastside Well-Known Member

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    I hooked it to my astron?
     
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  13. Justme

    Justme Active Member

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    For the PEP mod there is a much simpler method to use.
    Raise R 13 to 10 K it is now 2 K anywhere from 4.7 to 10 K will allow the PEP meter to linger longer at the max PEP so you can read it off asier.
    I use 4.7 K not to slow the meter down too much.

    The lighting of the meter is a small pcb with 2 leds on it, it is easy to slip an 100 --200 Ohm resistor in line to dim the leds further.
     
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  14. 1jonnyz

    1jonnyz Member

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    I just received one of these and when I tested several Cobra 29's the needle barely moved from dead key in avg mode, when I switch to PEP I get pretty good swing. When I test my Connex 3300hp-zx I get good swing on avg and real good swing on PEP. I would think that I should get some movement on avg with the cobras too?? Any thoughts?
     
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  15. sp5it

    sp5it Master of puppets

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    Depend how much pwr your Cobra generate as DK.
    Mike
     
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