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Does anyone have a manual or schematic for the Helper Instruments PS 250

w7fdd All Messages By This Member #213944 Hello, I have recently got a Helper Instruments PS 250. Does anyone have a manual or schematic for the Helper Instruments PS 250. thanks 73's Brian w7fdd
M M All Messages By This Member #213998 The only info I've ever found on that supply is here: It's on page 5 or 6... ? I used to use one back in the mid to late 90s. ? Helper was founded by Bill Detwiler (I forget his callsign) around 1975 and went out of business around 1999-2000 after he died. The the remains were acquired by Zetron.? Zetron, in turn, was acquired by JVC / Kenwood but continues as a company.?? At a recent IWCE trade show the people in the Zetron booth had no idea that they once sold Helper products (I tease them that they should bring back the RF Millivoltmeter). ? Mike WA6ILQ ?
MILLIN SEE All Messages By This Member #214001 I have a helper rf voltmeter that I've picked up at a ham swapmeet for $5.00..still works but needs calibration. toggle quoted message Show quoted text ----- Original Message ----- From: M M via groups.io <wa6ilq@...> To: [email protected] Sent: Thu, 20 Mar 2025 14:23:36 -0600 (MDT) Subject: Re: [repeater-builder] Does anyone have a manual or schematic for the Helper Instruments PS 250 The only info I've ever found on that supply is here: It's on page 5 or 6... I used to use one back in the mid to late 90s. ? Helper was founded by Bill Detwiler (I forget his callsign) around 1975 and went out of business around 1999-2000 after he died. The the remains were acquired by Zetron.? Zetron, in turn, was acquired by JVC / Kenwood but continues as a company.?? At a recent IWCE trade show the people in the Zetron booth had no idea that they once sold Helper products (I tease them that they should bring back the RF Millivoltmeter). Mike WA6ILQ
w7fdd All Messages By This Member #214012 开云体育 Mike, I found that page on rptrbldr also. Its not much but better than nuthin. Thanks for the bit of history. I didn't know that before. I have one of the Helper millivoltmeters. It sure works well for me. Sure are a lot for sale on Ebay without the probe. Fortunately I got one at a reasonable price with the probe. Did you see that design for a homebuilt probe? Somewhere here on rptrbldr I think. thanks again. -- 73s Brian w7fdd
k9wkj All Messages By This Member #214072 funny that name popped up?? being a little kid in this realm?? I had never heard of Helper?? but saw this yesterday on the bay??

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