Re: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[W5OMR/Geoff]

Dan wright wrote:


73 = Best Regards,
-Geoff/W5OMR


---

Thanks to you too, Geoff!

I been listenin' to you fellers there on 75 AM early in the morning
for quite some time.I guess I need to get the Apache/HQ-140
fired up.heheheheh...

73 de Dan -- WAØJRD ..



By all means, get in there and TALK it up, Dan!

I'll be on in the morning.  Might even make the early sked.

oh, yeah - and with the cold front moving through the entire nation, and 
pushing off the NE coast this afternoon, the conditions should be plenty 
quiet on the bands!


I'll be just north of Houston, TX this weekend, operating John/WA5BXO's 
big rig, visiting with Otis/K5SWK, playing radio with BJ/WB5PKD, 
swapping lies with Perry/W5KGZ... gonna be a great time.


Poor John is going to be off camping with his two sons, which are in Boy 
Scouts.  Family, of course, comes first.


As for the Apache, there's no better sounding Apache than Lum/K5AYD's.  
I don't know what magic he's got up there in Cache, OK, but that 120w is 
heard nationwide, in the noisey Summer months!


See you on the air, Dan!

---
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[Dan wright]

---
73 = Best Regards,
-Geoff/W5OMR


Thanks to you too, Geoff!

I been listenin' to you fellers there on 75 AM early in the morning
for quite some time.I guess I need to get the Apache/HQ-140
fired up.heheheheh...

73 de Dan -- WAØJRD ..

Re: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[Dan wright]

The DX-60 mods are found on:


Thanks Bob!

de dan 

Re: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[W5OMR/Geoff]

Dan wright wrote:


Jim sez:


A cleaned up (audio mods and
less carrier control) Heath DX-60 is a good companion to the SB-220.



Two questions.

#1- how bout an SB-200 for puttin' behind a DX-60?

and...

#2- Where might one find the aforementioned DX-60 mods?

tnx es 73 de Dan -- WAØJRD ..



http://www.google.com/search?hl=en&q=dx-60+mods&btnG=Google+Search

---
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[Rbethman]

The DX-60 mods are found on:

www.amwindow.org

Go to mods

Look for DX-60 (WC3K)

Should work just fine with the SB-200.  MAY have to dial it back a bit, 
BUT I doubt it.


My works fine with an LK-500ZB, pair of 3-500Zs.  Should ALSO do fine 
with the 572Bs


Going to make Bill's, (WC3K) SK, last mod to add PTT available as soonn 
as work QUITS springing last minute assignments!  Have to work again 
tonight from 9PM until 5AM.


Put over 60 hours in last week.

Bob - N0DGN

Dan wright wrote:


Jim sez:


A cleaned up (audio mods and
less carrier control) Heath DX-60 is a good companion to the SB-220.



Two questions.

#1- how bout an SB-200 for puttin' behind a DX-60?

and...

#2- Where might one find the aforementioned DX-60 mods?

tnx es 73 de Dan -- WAØJRD ..


Bob - NØDGN
  
+--+

|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I,1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--.oooO---Oooo.---+
|  () ()   |
|   \  (   )  /|
|\ _) ( _/ |
|ALL E-mail received and sent scanned by AVG & Norton System Works |
+--+


   

RE: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[Dan wright]

Jim sez:


A cleaned up (audio mods and
less carrier control) Heath DX-60 is a good companion to the SB-220.


Two questions.

#1- how bout an SB-200 for puttin' behind a DX-60?

and...

#2- Where might one find the aforementioned DX-60 mods?

tnx es 73 de Dan -- WAØJRD ..

Re: [AMRadio] Re: Need list of good AM radios to start looking for .

[Rbethman]

Folks,

Go to the AM Window site.

Under DX-60 mods (WC3K), you'll find a modulation mod to monitor 
exceeding 100%.  VERY easy to do, AND inexpensive.  IF the led flashes, 
you are exceeding 100%.  This is a beautiful mod, and Bill used the LED 
in lieu of a front panel screw.  Completely reversible, and NO extra 
holes in the panel.


Bob - N0DGN

W5OMR/Geoff wrote:


Jim candela wrote:


Dan,

   I like your suggestion. I never tried it, so I am no authority on 
this
modification. In general, this would change the modulator load 
impedance,

and the RF pi network formulas would suggest juggling the L/C ratio to
maintain the same 'Q'. I might be tempted to use some sort of 
negative cycle

loading to contain the modulator, and minimize splatter by keeping the
negative modulation below 100%, and letting the positive peaks fly 
upward
beyond 100%. Doing this however may raise the PEP drive power too 
high for
the linear, so that's another issue to contend with. Running both 
modulator
and final RF stage at reduced B+ may still be the best approach when 
driving
an amplifier with low drive requirements. Another option is to use 
the 2e26

and low B+ for really low drive amplifiers.



The reason the 2E26 was suggested (I've heard it several times, 
m'self) is that it requires exactly the same B+, screen voltage, grid 
voltage and everything else that the 6146 does.  The 2E26 just has 
half of the plate dissapation.


Therefore, ass/u/me'ing 600V for B+, and half the current (50mA vs 
100mA in the 6146) the final impedance changes from 6000 ohms to 
12,000 ohms.  You would think that it would be easier for the 
modulators to work into a higher impedance range.


I like the idea of using the 300 or so Low Voltage supply on the 
final, but I think for audio sake, I'd leave the B+ up on the 
6L6/1614/7027's


300v @ 50mA would still be 6k ohms of Z in the final.
(not to mention half of the current being consumed by the modulation 
transformer secondary, and therefore further away from saturtion)


As for keeping the audio at a 'tame' level, there is no better tool 
for operating AM than a good O'scope because (as Don Chester/K4KYV has 
often said)"
"Operating your AM rig without an O'scope, is like driving you car at 
night, without headlights."


---
73 = Best Regards,
-Geoff/W5OMR

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--
Bob - NØDGN
  
+--+

|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I,1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--.oooO---Oooo.---+
|  () ()   |
|   \  (   )  /|
|\ _) ( _/ |
|ALL E-mail received and sent scanned by AVG & Norton System Works |
+--+


   

Re: [AMRadio] Re: Need list of good AM radios to start looking for .

[W5OMR/Geoff]

Jim candela wrote:


Dan,

   I like your suggestion. I never tried it, so I am no authority on this
modification. In general, this would change the modulator load impedance,
and the RF pi network formulas would suggest juggling the L/C ratio to
maintain the same 'Q'. I might be tempted to use some sort of negative cycle
loading to contain the modulator, and minimize splatter by keeping the
negative modulation below 100%, and letting the positive peaks fly upward
beyond 100%. Doing this however may raise the PEP drive power too high for
the linear, so that's another issue to contend with. Running both modulator
and final RF stage at reduced B+ may still be the best approach when driving
an amplifier with low drive requirements. Another option is to use the 2e26
and low B+ for really low drive amplifiers.



The reason the 2E26 was suggested (I've heard it several times, m'self) 
is that it requires exactly the same B+, screen voltage, grid voltage 
and everything else that the 6146 does.  The 2E26 just has half of the 
plate dissapation.


Therefore, ass/u/me'ing 600V for B+, and half the current (50mA vs 100mA 
in the 6146) the final impedance changes from 6000 ohms to 12,000 ohms.  
You would think that it would be easier for the modulators to work into 
a higher impedance range.


I like the idea of using the 300 or so Low Voltage supply on the final, 
but I think for audio sake, I'd leave the B+ up on the 6L6/1614/7027's


300v @ 50mA would still be 6k ohms of Z in the final.
(not to mention half of the current being consumed by the modulation 
transformer secondary, and therefore further away from saturtion)


As for keeping the audio at a 'tame' level, there is no better tool for 
operating AM than a good O'scope because (as Don Chester/K4KYV has often 
said)"
"Operating your AM rig without an O'scope, is like driving you car at 
night, without headlights."


---
73 = Best Regards,
-Geoff/W5OMR

RE: RE: [AMRadio] Re: Need list of good AM radios to start looking for .

[Jim candela]

Dan,

I like your suggestion. I never tried it, so I am no authority on this
modification. In general, this would change the modulator load impedance,
and the RF pi network formulas would suggest juggling the L/C ratio to
maintain the same 'Q'. I might be tempted to use some sort of negative cycle
loading to contain the modulator, and minimize splatter by keeping the
negative modulation below 100%, and letting the positive peaks fly upward
beyond 100%. Doing this however may raise the PEP drive power too high for
the linear, so that's another issue to contend with. Running both modulator
and final RF stage at reduced B+ may still be the best approach when driving
an amplifier with low drive requirements. Another option is to use the 2e26
and low B+ for really low drive amplifiers.

Regards,
Jim

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, November 16, 2005 10:57 AM
To: Discussion of AM Radio
Subject: Re: RE: [AMRadio] Re: Need list of good AM radios to start
lookingfor .




> You do usually need to drop the
> power a bit to keep from over driving most linears. One >modification is
to
> run the RF Final 6146 and modulator off the low B+.
>
> Jim WD5JKO

I have also heard that you can just replace the
6146 with a 2E26 and do nothing else. Is this true?
Andwhat are the tradeoffs, if any?

73 de Dan -- WAØJRD ..


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Re: RE: [AMRadio] Re: Need list of good AM radios to start looking for .

[dw73454]

> You do usually need to drop the
> power a bit to keep from over driving most linears. One >modification is to
> run the RF Final 6146 and modulator off the low B+.
> 
> Jim WD5JKO

I have also heard that you can just replace the 
6146 with a 2E26 and do nothing else. Is this true?
Andwhat are the tradeoffs, if any?

73 de Dan -- WAØJRD ..

RE: [AMRadio] Re: Need list of good AM radios to start looking for . . .

[Jim candela]

Any good AM rig with 10-20 watts carrier can be brought to legal limit with
a big G-G linear amplifier like the SB-220. A cleaned up (audio mods and
less carrier control) Heath DX-60 is a good companion to the SB-220.

If you want plate modulation. my vote would be for something like a Johnson
Viking Ranger II. There are tons of modification sites on the Ranger, and
even in stock form these do pretty well. You do usually need to drop the
power a bit to keep from over driving most linears. One modification is to
run the RF Final 6146 and modulator off the low B+.

Jim WD5JKO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Patrick Jankowiak
Sent: Monday, November 14, 2005 9:33 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] Re: Need list of good AM radios to start looking for . .
.


I'm a bit biased, as a tube audio guy, but I would go for a transmitter
that has a push-pull plate modulator for the final.

For the receiver, find one that is double conversion or better and has
selectable bandwidth via LC filters and a crystal filter. tuned circuits
are not so sharp, but sound real good when wide open on a strong signal!

The Hallicrafters SX-28, to me, is one of the best sounding AM receivers
but they drift a bit and are not that sensitive. Can be pricey too.
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