[AMRadio] New Guy to AM


Jim Candela jcandela at prodigy.net
Thu Mar 22 21:18:52 EST 2007


Bow,

   At the following link is a schematic of an AM rig that uses similar
tubes. You could replace the 6AG7 with a 6V6 or 6K6, and replace the two
6LF6's with four 6DQ6's. This rig is good for 25 watts AM, and doesn't need
a modulation transformer. The downside is the Class A series modulator, and
the need for a +1100v B+. It sure is simple though, and should be easy to
home brew.

 http://www.amwindow.org/tech/pdf/eckfinal2.pdf


  As for 30-40 watts AM between Houston, and Round Rock, you should be 5-9
here in the early evening until the band lengthens out. My main rig right
now is a Gonset G76 that runs 55 watts AM, and I get out really well with it
using an 80 FW loop up about 18'. This is a 'cloud burner' antenna that does
really well out to about a 300 mile radius. This is perfect to talk to
Houston. The trick with the Icom 718 will be to achieve full modulation
rather than maximum carrier, and squishy modulation from overload or ALC
popping. You are better at 25 watts carrier instead of 40.

Maybe we can make a schedule for tomorrow evening at 7'ish?

Jim
JKO

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Bow
Sent: Friday, March 23, 2007 2:30 AM
To: 'Discussion of AM Radio in the Amateur Service'
Subject: RE: [AMRadio] New Guy to AM

Hey Jim!

I live on the northwest side of Houston, TX and I am on 75M, but only tried
SSB so far, I don't think my screaming Icom IC-718 will do much with it's
30-40 watts of AM. 

My current tube stash consists of:
2- 815
2- 807W
3- 12SK7
1- 12A6
1- KT88
2- 6DQ6
3- 6L6
3- 6K6
1- EL34
1- 6V6

and several dual triode Preamp tubes...

Is there any hope? LOL

Bow

W5EFR


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim Candela
Sent: Thursday, March 22, 2007 19:23
To: 'Discussion of AM Radio in the Amateur Service'
Subject: RE: [AMRadio] New Guy to AM

Bow,

 Welcome to the group! I hope this group provides you with knowledge and
camaraderie from a bunch of fine folks who have a passion for AM.

So where do you live? Do you work 75 meters? 

I don't have any experience with the 815, but I have heard that this is one
of those tubes that suffers from imperfect vacuum seals, and many NOS 815's
are bad now even though unused. Maybe some others can chime in on that
comment.

You can make a mighty fine AM rig out of three 807's, (1 RF final, and two
P-P modulators) and when conservatory run will provide 15-30 watts of high
quality AM. For more power something like a Heathkit SB-220 can transform
this kind of rig to full legal AM power when the peaks extend up to ~ 1500
watts PEP with a resting carrier level at around 350 watts.

Since you identify with the guitar amp circuit, this rig combo is like a
Fender Champ acoustically coupled to a big solid state PA amplifier.

Regards,
Jim
WD5JKO 




______________________________________________________________
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html List Home:
http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with the
word unsubscribe in the message body.

--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.16/729 - Release Date: 3/21/2007
07:52
 

-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.16/729 - Release Date: 3/21/2007
07:52
 

______________________________________________________________
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio at mailman.qth.net
To unsubscribe, send an email to amradio-request at mailman.qth.net with
the word unsubscribe in the message body.


-- 
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.17/730 - Release Date: 3/22/2007
7:44 AM





More information about the AMRadio mailing list

This page last updated 21 Oct 2017.