|[AMRadio] Best AM BoatanchorReceiver or AM RiceboxReceiver
brett.gazdzinski at verizonbusiness.com
Sun Oct 1 20:16:48 EDT 2006
As far as my receiver goes, I have a 4.5 and a 5.5 kc filter
in it right now, and when things get nasty, I would rather not, thank you.
I can tune off to one side, the filters (KIWA) are like mechanical filters,
but sometimes its not worth it.
I had an icom 756 pro with the dual passband tuning, and that receiver was
no better (actually worse) then the home brew.
I have had an R2000, TS440, IC735, and the 756pro, and all sucked big time
compared to the homebrew.
The R390A was good, but real noisy.
The SX17 had push pull 6V6 output tubes to give 17 watts out,
so at 2 watts the distortion was real low.
The Scott SLRM had push pull 25L6's in a direct coupled
(from the driver tube) audio, and that sounded very good.
The homebrew is nothing fancy, a link tuned antenna into the mixer grid,
2 stages of IF amp, hi fi detector with AGC, and outboard audio (Marantz).
There is a bfo (455khz xtal osc), and an s meter, IF gain, digital frequency
readout, and that's about it.
Think of your old tube table radio with a good filter and good audio,
simple, broad as a barn door (pre filter), low noise, low stage....
The homebrew is not general coverage, does not work well with a 5
foot antenna, and does not go above 40 meters, but for
160, 80 and 40 meters with the TX antenna, it works better then anything
else I have ever had:
And the ones I forget...I once had a Sony receiver with a synchromesh
detector and it sucked.
I used to use the R390a, and I could hear signals clearly on the homebrew
that were below the noise level on the R390a.
I think, sometimes simple is better...
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim candela
> Sent: Sunday, October 01, 2006 12:16 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: [AMRadio] Best AM BoatanchorReceiver or AM
> RiceboxReceiver Discussion
> Hi All,
> Yesterday morning on 75 meters we had at least 3 AM QSO's going on
> simultaniously. It was glorious! I heard QSO's on 3880, 85,
> and 90. At the
> same time there were SSB groups on 3878, and 3894.
> At my QTH (central Texas) with my equipment, my SP-600 was
> useless. Yes I
> could use the 3Kc IF bandpass position, and tune off center
> to favor one
> sideband or another. As soon as the audio midrange would
> brighten up I'd
> hear QRM from an adjacent channel. Switching in the 8kc
> position resulted in
> a maddening array of signals besides the one I was wanting to hear.
> Then I switched to my Icom R-75 with 3 mechanical filters
> that are about
> 2.4, 3.5 and 6 khz in bandwidth. I could hear all 3 QSO's Q5
> in AM with the
> 3.5 Khz filter, but it was no fun because the upper mids, and
> all highs were
> gone. Then tune off 1 Khz, and much better or turn on the synchronous
> detector, offset the passband tuning 2.4 khz (or 3.5), select
> the 2.4 filter
> (or 3.5), and golly Gee! Nice sounding AM on all 3 QSO's so
> long as you pick
> the better sideband.
> As the morning went on the QRM went away, and all we had was
> the traders net
> on 3890. Now the SP-600 ruled until the signals started dropping from
> daytime propagation kicking in. Now I was experiencing QSB, selective
> sideband fading, and occasional impulse line noise. Switch
> back to the R-75,
> turn on the noise blanker, and synchronous detector. Back to
> Q5 again!!
> This is not a tube versus solid state issue. Chuck Wa0zhh has
> a all tube HB
> receiver that has most of the modern features, and his
> receiver can probably
> blow the doors off my R-75. Chuck likes old style octal tubes
> too like the
> 6L7 in his noise blanker circuit.
> So how would a R-390 have done yesterday, or a NC-183D, Bretts HB tube
> receiver, or one of Darrel's HB tube receivers?? Just curious.
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