Dave’s review of the MFJ-1026/1025 and regulated AC adapter recommendations


Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who shares the following reply to TomL’s post More Anti-Noise Ideas:

My VERY NOISY Sony CRT TV has gone to the great electronics recycling bin in the sky thank goodness. But I still have a MFJ-1026 here and need to use it when the neighborhood gets noisy. Intermittent power line noise is the main issue these days for me.

[Note that] my Monitoring Times review from April 2007 on the MFJ-1026 (and 1025 model without the preamp, but is best to have it) is still available here :


(is also linked on my web page, with many other of our other favorite ones : http://webpages.charter.net/n9ewo2/links.html )

jameco-ac-adapterI still power it with a analog REGULATED Jameco 170245 12 volt (1 amp) ac adapter.

Last batch I purchased a few years ago were still 100% clean and analog regulation. As I have covered in the past, SOME of Jameco excellent REGULATED AC adapters have gone to using switching regulator devices inside (and these no longer clean for any radio use).

Click here to view the170245 12 volt AC adapter on Jameco.

DX Engineering is about to come out with a improved version of the premium priced NCC-1, called the NCC-2. Mid late November Delivery ?? Never had our hands on one the pricey NCC-1 critters as the MFJ gets the job done for us (let alone affording it).



You make an excellent point: it’s important to power your noise-canceling device with a quality, clean, regulated AC adapter.

Thank you for sharing the links to your review and the AC adapter recommendations, Dave!

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2 thoughts on “Dave’s review of the MFJ-1026/1025 and regulated AC adapter recommendations

  1. TomL

    Here is the exact email from yesterday. The “specs” Arnold mentions does not say why this is called a Linear power supply and he does not seem concerned if it really is or not. If this has a switching type regulator, seems like Jameco (the company) would not even know and they don’t seem to care to find out. Also, Arnold does not respond to my need for a quiet RF adapter and mentions something totally unrelated (60 Hz input). My opinion is that they don’t know and they don’t want to know what is inside these things. *** I say, make them prove it to me before spending any thin dime on them (or any of my time).***


    RE: 12 Volt 1.5 Amp 18 Watt Linear Regulated Wall Adapter
    Arnold Pena
    Yesterday, 10:05 AMYou;Technical Support

    Hi Thomas,

    I don’t have a datasheet for this adapter, but the specs are on the Overview tab. The frequency on the input is 60Hz; fixed.

    Input voltage: 120 VAC @ 60 Hz

    Arnold Pena

    Jameco Tech Support

    1355 Shoreway Rd.

    Belmont, Ca. 94002


    (650)592-6718 x383

    From: Thomas
    Sent: Monday, October 24, 2016 6:20 PM
    To: Technical Support
    Subject: 12 Volt 1.5 Amp 18 Watt Linear Regulated Wall Adapter

    Part no.: 2227410
    Manufacturer: Arndt Electronics
    Manufacturer no.: MT18-9120150-A1

    So, what makes this a “Linear” power supply??? There is no specs for it and the price seems way too cheap. I am looking for a RF-quiet power supply for some radio equipment that does not cost an arm and a leg. What makes this a Linear power supply and where are the specs that actually say so?!?!?!

    Thanks for any info!!


  2. TomL

    So where can I buy an RF-quiet 12 volt AC adapter that is affordable?? The latest Jameco response as to what makes them claim that their 18 Watt version of the supposedly “Linear and Regulated” adapter was completely ignored and given a useless non-answer about fixed output frequency of 60 Hz!!! Frankly, I think Jameco are a bunch of liars, putting fictitious descriptions that do not reflect the traditional interpretation of the definition of technical words as we expect from a technical manual. A “switching” type is NOT “Linear” type, period. We need to stick to standards and demand that suppliers not change the meaning of words to suit a rationalized profit at our RF noise expense!!!


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