|[AMRadio] Wanted: Receiver - New England|
macklinbob at msn.com
Tue Feb 19 20:17:18 EST 2008
Single conversion receivers with 455KC IFs really need a converter above 20M
because of the image problem.
Some of the old ARRL Handbooks have projects for both converters and
"Real Radios Glow in the Dark"
----- Original Message -----
From: "Brett Gazdzinski" <brett.gazdzinski at verizon.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Tuesday, February 19, 2008 5:12 PM
Subject: Re: [AMRadio] Wanted: Receiver - New England
> I think you only need the rf amp above 20 meters.
> My homebrew receivers have no rf amp before the mixer
> and hear better then the R390a I had did.
> Now if you want good performance on 15 and 10 meters, you
> likely need an rf amp, or maybe if you use really crappy antenna's, but
> on a good antenna, you get much more signal then even the
> old gear needs.
> ----- Original Message -----
> From: "Jim Miller WB5OXQ in Waco" <wb5oxq at grandecom.net>
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Sunday, February 17, 2008 8:19 PM
> Subject: Re: [AMRadio] Wanted: Receiver - New England
> > Watch out for some of the very old receivers that don't have a very good
> > front end and are not very sensitive. I would try to look at specs and
> > a receiver that has at least 1 microvolt sensitivity. Stay away from
> > smaller rigs that do not have an rf amplifier and some don't. always
> > the tube lineup to make sure. Some even have 2 rf amp tubes. I have
> > rigs like the NC183s that have push pull audio out and others like an
> > that had only a 6aq5 making a watt but sounded real good and rich
> > to the correct speaker and the speaker has a lot to-do with how good the
> > audio sounds. I use a 2 way speaker that came from a tube type Zenith
> > stereo radio. It has a 8" woofer and a 2" tweeter and was built to be
> > on a radio that only made 1.5 watts of audio so it drives easily with
> > ended output radios and sounds very full and rich. If you love rich
> > stay away from small speakers that have small drivers in them but be
> > that if you use a large system built for a home stereo system it may
> > more power than many radios can put out.
> > Here is a good web site that may have useful information for you.
> > http://www.dxing.com/swrx.htm
> > ----- Original Message -----
> > From: "JT Croteau" <jt.n1ese at gmail.com>
> > To: "Discussion of AM Radio in the Amateur Service"
> > <amradio at mailman.qth.net>
> > Sent: Sunday, February 17, 2008 6:58 PM
> > Subject: Re: [AMRadio] Wanted: Receiver - New England
> > >I want to thank everyone who has responded so far, both on and off
> > > list, to this thread. Brett, N2DTS, said, a couple posts posts back,
> > > that I need to take a better inventory of my priorities so let me try
> > > and clarify what they are to me.
> > >
> > >>From what I've read, there are two categories of receivers;
> > > "Battle-Fields" and Hi-Fidelity and it is very difficult to have your
> > > cake and eat it to. Unfortunately, I am trying to have a mixture of
> > > both but leaning more towards Hi-Fi because it is the pure love of the
> > > sound of AM that is driving me to setup this AM station.
> > >
> > > I am learning that there is no perfect receiver and it is very hard
> > > for a newbie like me to pick one. I wish I had the luxury to afford
> > > to buy several different ones like some people but I can only afford
> > > one receiver at the moment A big problem for newbies is the fact
> > > that EVERYONE has differing opinions for each model and it's often
> > > hard to get two people to totally agree on the same model. For
> > > example, I'll ask for opinions on an ABC-123 and one person will
> > > reply, "oh yeah, it's awesome on AM" while another will say "stay
> > > away, it's only good for slopbucket signals". If I could afford
> > > multiple purchases, it'd be much easier to take a gamble and
> > > experiment but I can't so it's very difficult to choose from just
> > > looking at specs and "opinions".
> > >
> > > With this said:
> > >
> > > AM 75M and 40M coverage is my primary interest at this time, I will
> > > NEVER be using the radio to tune in slopbucket nor CWer. SWL and 160M
> > > coverage would be nice as well but it will be a couple years before I
> > > have space for a 160M antenna.
> > >
> > > Hi-Fidelity is near the top of my must haves but not if it's
> > > results in a huge hit on receiver performance. However, I definitely
> > > don't want bottom of the barrel communications grade audio. I've been
> > > in some shacks where the audio fills the room and you can feel the
> > > audio down to your bones. I want to achieve this or as close as I can
> > > get within my budget.
> > >
> > > Looks, style, size, and weight don't really matter as it's what's
> > > inside the box that counts to me. Ideally the smaller the better and
> > > if it fits in a standard 19" rack, all the better as I have plenty of
> > > rack space.
> > >
> > > Budget - Yeah, this will always be an issue for me. But I can
> > > realistically afford to spend a max. of $400 on a receiver so I may
> > > not be able to get super Hi-Fi with this budget but I would think that
> > > I should be able to still find something with very good fidelity. If
> > > I had the money to go all out, I'm the type of person who definitely
> > > would so I am not trying to cheap out on this. But I do want to get
> > > something now rather than save an wait.. patience and me have never
> > > gotten along.
> > >
> > > Since my first post a couple days ago, I've been reading a bit about
> > > Hallicrafters SX-17's and SX-42's with their push-pull 6V6's and how
> > > they can really make some very nice audio - a couple people seem to
> > > really like these. However, for some reason, these two rigs don't
> > > seem to be mentioned much.. are they genuine "sleepers" in this case?
> > > The SX-17 appears to have good sensitivity and good selectivity with
> > > an IF bandwidth switch actually works. I think I read that the narrow
> > > position is somewhere around 4-5 kc and the wide is somewhere around
> > > 10-12 kc.
> > >
> > > Has anything I've said made sense and may point me to more specific
> > > models of receivers I should be looking at?
> > >
> > > Thanks again.
> > >
> > > --
> > > JT Croteau, N1ESE - Manchester, NH (FN42gx)
> > > Contest Manager, TARA Skirmish
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