[AMRadio] Re: HRO-50

Bob Young bobyoung53 at gmail.com
Mon Nov 26 17:58:25 EST 2007

> Message: 7
> Date: Mon, 26 Nov 2007 15:42:54 -0600 (CST)
> From: ne1s at neandertech.com
> Subject: Re: [AMRadio] HRO-50
> To: "Discussion of AM Radio in the Amateur Service"
>         <amradio at mailman.qth.net>
> Message-ID: <1196113374.v2.fusewebmail-243661 at ffuse48>
> Content-Type: text/plain;charset=iso-8859-1
> ----- Original Message -----
> Subject: Re: [AMRadio] HRO-50
> Date: Mon, November 26, 2007 16:03
> From: "Mike Sawyer" <w3slk at hughes.net>
> > What a pain in the scrote.
> I agree. Still, when the 1st HRO came out, nothing else on the market
> could touch it.
> >The manual says to adjust the coils for the low
> > end of the band, (in this case, I'm using coil set D 1.8-4.0M GC 3,5-4.0
> BS)
> > and there aren't any adj. available. I looked in the in each coil set and I
> > can see the coil but it looks as though it was designed not to be adj. and
> > I'm hesitant about attempting to adj. them.
> For the low end of the bands there is a 1/2 turn on the INTERIOR of the
> coil form that is to be moved either to buck or boost the main winding, or
> anything in between. "Pain in the Scrote" sums it up pretty well ;>) How
> you are supposed to make slight adjustments, noting the output level, pull
> the coil, poke that 1/2 turn a bit, again note the output level, and
> ultimately find the peak is beyond me. I usually optimize at the top of
> the band (where trimmer caps are accessible with the coil installed at the
> top, and watch the output level as I adjust) and take what I get at the
> bottom of the frequency range - life is too short! Maybe when I retire
> I'll do the PROPER alignment on my 2 HROs, if I run out of stuff to do...
> 73/GL,
> -Larry/NE1S

Those 1/2 turn coils inside of the box aren't that hard to adjust, all
you need is patience, three or four times in and out of the radio with
the coil box (for each 1/2 turn coil) and it should be OK, they're not
real touchy, you just want to get a feel for where each one is at
maximum. The more you align HRO's the better and quicker you get, the
first one is a learning experience, the coils after that will go
quicker and quicker, the peak is broad for the 1/2 turn internal coil.


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