[AMRadio] AMRadio Digest, Vol 132, Issue 7


Wade Staggs tvman1954 at gmail.com
Tue Jan 13 07:41:19 EST 2015


*Sorry Guys,*
*                         I just realized that he is talking about running
a Collins 30S-1 Amplifier at about 150 Watts Carrier....... Please, forgive
my rant. *

*                                             73 from Wade/KJ4WS*

On Tue, Jan 13, 2015 at 5:39 AM, <amradio-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. Re: Using an old Collins amp for AM (Rob Atkinson)
>    2. Re: Using an old Collins amp for AM (Meir WF2U)
>    3. Re: Using an old Collins amp for AM (Paul Baldock)
>    4. Re: Kenwood MC-50 mike with AM gear (Gary Schafer)
>    5. 30S-1 and AM (CL in NC via AMRadio)
>    6. Re: Using an old Collins amp for AM (Collin via AMRadio)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 12 Jan 2015 18:42:18 -0600
> From: Rob Atkinson <ranchorobbo at gmail.com>
> To: FRANK HUGHES hughes <frsahu0003 at embarqmail.com>
> Cc: Discussion of AM Radio in the Amateur Service
>         <amradio at mailman.qth.net>
> Subject: Re: [AMRadio] Using an old Collins amp for AM
> Message-ID:
>         <
> CALWD7Z5kvYpocUteygL+68wO6hsk5WTee3X74w5ZEOo5HU_bhw at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Just run the collins rig into the antenna.  It should put out at least
> 100 w.  You might need to change the 4D32.
>
> 73
>
> Rob
> K5UJ
>
> On Mon, Jan 12, 2015 at 6:09 PM, FRANK                     HUGHES
> hughes <frsahu0003 at embarqmail.com> wrote:
> > Hi,
> > I would like to be able to participate in some of the AM nets.
> > My 32V-2 only makes 70 watts of carrier. (low voltage selected)
> > I have a good condition Collins 30S-1 that I normally use for SSB.
> > If the power is kept down to about 150 watts of carrier, could I drive
> the amp w/ the 32V-2?
> >
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 12 Jan 2015 20:10:30 -0500
> From: "Meir WF2U" <wf2u at ws19ops.com>
> To: "'FRANK                     HUGHES hughes'"
>         <frsahu0003 at embarqmail.com>,    <amradio at mailman.qth.net>
> Subject: Re: [AMRadio] Using an old Collins amp for AM
> Message-ID: <6F7CCCE6C3CC440EBF95011F96C7DAE9 at MBDCONSULTING.LOCAL>
> Content-Type: text/plain;       charset="us-ascii"
>
> Raising the carrier from 70W to 150W means about gaining 1/2 of an S-point
> on the receiving end. 1 S-point is 6 dB increase in power, which is
> quadrupling it, as if you increased from 70 to 280 W carrier. Doubling the
> power is 3 dB, which is a half S-point.
> It's not worth the effort.
>
> 73, Meir WF2U
> Landrum, SC
>
> -----Original Message-----
> From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of FRANK
> HUGHES hughes
> Sent: Monday, January 12, 2015 7:10 PM
> To: amradio at mailman.qth.net
> Subject: [AMRadio] Using an old Collins amp for AM
>
> Hi,
> I would like to be able to participate in some of the AM nets.
> My 32V-2 only makes 70 watts of carrier. (low voltage selected)
> I have a good condition Collins 30S-1 that I normally use for SSB.
> If the power is kept down to about 150 watts of carrier, could I drive the
> amp w/ the 32V-2?
>
>
> My first homebrew amp is under construction, but until it is ready, I am
> hoping to find a temporary
> solution.
> 73
> Frank
> KJ4OLL
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>
> ------------------------------
>
> Message: 3
> Date: Mon, 12 Jan 2015 17:42:21 -0800
> From: Paul Baldock <paul at paulbaldock.com>
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] Using an old Collins amp for AM
> Message-ID: <mailman.996.1421149195.16640.amradio at mailman.qth.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
>
> It's definitely worth the effort, 3dB is very significant for a
> marginal signal. However with your 30S1 you should be able to easily
> get 250W carrier and 1000W PEP which is 5.5dB more than your 70W. If
> you have modified your 30S1 for higher screen voltage, then you can
> get 1500W PEP and 375W carrier which is legal limit in the USA.
>
> You will only need 30W or so of  carrier drive for, so for best
> modulation characteristics you should put an attenuator between the
> the driver rig and the 30S1 and then tune the driver for 70W (or 100W
> if that really is the spec).
>
> Don't forge to tune the linear for maximum PEP and NOT for maximum
> carrier. The carrier level should be 25% of the PEP.
>
> - Paul   KW7Y
>
>
> At 05:10 PM 1/12/2015, you wrote:
> >Raising the carrier from 70W to 150W means about gaining 1/2 of an S-point
> >on the receiving end. 1 S-point is 6 dB increase in power, which is
> >quadrupling it, as if you increased from 70 to 280 W carrier. Doubling the
> >power is 3 dB, which is a half S-point.
> >It's not worth the effort.
> >
> >73, Meir WF2U
> >Landrum, SC
> >
> >-----Original Message-----
> >From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of FRANK
> >HUGHES hughes
> >Sent: Monday, January 12, 2015 7:10 PM
> >To: amradio at mailman.qth.net
> >Subject: [AMRadio] Using an old Collins amp for AM
> >
> >Hi,
> >I would like to be able to participate in some of the AM nets.
> >My 32V-2 only makes 70 watts of carrier. (low voltage selected)
> >I have a good condition Collins 30S-1 that I normally use for SSB.
> >If the power is kept down to about 150 watts of carrier, could I drive the
> >amp w/ the 32V-2?
> >
> >
> >My first homebrew amp is under construction, but until it is ready, I am
> >hoping to find a temporary
> >solution.
> >73
> >Frank
> >KJ4OLL
> >______________________________________________________________
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>
> ------------------------------
>
> Message: 4
> Date: Mon, 12 Jan 2015 21:41:27 -0600
> From: "Gary Schafer" <garyschafer at largeriver.net>
> To: "'John Coleman'" <jc at pctechref.com>, "'John Neeley'"
>         <w6zkh at att.net>,        <amradio at mailman.qth.net>
> Subject: Re: [AMRadio] Kenwood MC-50 mike with AM gear
> Message-ID: <BD5C009D8BEA4E1B96D3F2DF39684982 at garyPC>
> Content-Type: text/plain;       charset="us-ascii"
>
> Hello John,
>
> A little story about mikes. A long time ago I had a heath SB100 transceiver
> that I had a dynamic mike hooked to. The mike had a transformer in it.
> Everything worked fine.
> I decided to hook up a D104 crystal mike to the rig. It had low and
> distorted audio. I went to the radio store and got a new element for the
> D104, same thing. Took the element back for another one and it was the
> same.
> I finally swapped out the first audio tube and everything worked great.
> Turns out that the first audio tube (6U8 I think) had grid leakage. With
> the
> transformer mike it held the grid at ground (the grid was direct connected
> to the mike jack thru a resistor) and the bias was correct.
> With the crystal mike it allowed the bias to drift up and put the tube into
> saturation and killed the audio.
>
> 73
> Gary  K4FMX
>
> > -----Original Message-----
> > From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of John
> > Coleman
> > Sent: Monday, January 12, 2015 3:33 PM
> > To: 'John Neeley'; amradio at mailman.qth.net
> > Subject: Re: [AMRadio] Kenwood MC-50 mike with AM gear
> >
> > Hi John, A lot of the old rigs did not even have a coupling capacitor to
> > the
> > grid of the preamp stage.  This is of no consequence when using a
> > crystal/ceramic microphone, but other mics may drain your grid bias on
> > the
> > preamp tube and cause a lot of distortion.  If the coupling cap is not
> > there
> > put one in. .01 to .05 is good.  Also a lot of the modern microphones
> > have
> > way to much bass response for the old rigs modulator and modulation
> > XFMR. A
> > coupling capacitor in series with the microphone cable and a resistor
> > across
> > the cable on the rig side of the coupling capacitor will reduce the low
> > frequency response. Start with a .05 uf and 100K resistor. Decreasing
> > the
> > value of either will reduce low frequency output and vice versa.  Don't
> > worry about matching impedance.  The 1 or 2 meg resistor at the preamp
> > grid
> > is there for what is known as contact bias. And it works well with the
> > crystal/ceramic microphone as they actually  have their best response
> > with
> > no load or very high resistance.
> >
> > Good Luck,
> > John, WA5BXO
> >
> > -----Original Message-----
> > From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of John
> > Neeley
> > Sent: Tuesday, January 06, 2015 11:25 AM
> > To: amradio at mailman.qth.net
> > Subject: [AMRadio] Kenwood MC-50 mike with AM gear
> >
> > I have a Kenwood MC-50 mike and am wondering if I can use it with my
> > older,
> > tube type AM gear, like the HT-32a, Valiant or DX-100?  Otherwise if
> > not,
> > will need to get a old D-104, etc.  Any info would be greatly
> > appreciated.
> >
> > John W6ZKH
> > ______________________________________________________________
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>
> ------------------------------
>
> Message: 5
> Date: Mon, 12 Jan 2015 20:19:36 -0800
> From: CL in NC via AMRadio <amradio at mailman.qth.net>
> To: amradio at mailman.qth.net
> Subject: [AMRadio] 30S-1 and AM
> Message-ID:
>         <1421122776.39799.YahooMailBasic at web160605.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> It takes a linear amplifier to amplify AM and this amp qualifies.  It is
> rated at 1KW input power, CW has a 50% duty cycle, and takes 60-100 watts
> to drive to full output.  You won't be able to run it at the  AM current
> legal limit on output power of 350 watts, but you should be able to load it
> up to 350 watts input and expect around 200+ watts out for 800 or so watts
> peak output.  Please use a scope to set you modulation though.
>
> Charlie, W4MEC in NC
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 13 Jan 2015 06:39:39 -0500
> From: Collin via AMRadio <amradio at mailman.qth.net>
> To: AM Radio Reflector <AMRadio at mailman.qth.net>
> Subject: Re: [AMRadio] Using an old Collins amp for AM
> Message-ID: <FB765373-3E93-4ECB-8622-21EB6E952721 at aol.com>
> Content-Type: text/plain;       charset=us-ascii
>
> The 32V-2 is what I use most of the time on the AM nets with very good
> reports.
>
> Thank You, Collin
>
> > On Jan 12, 2015, at 19:20, wa9vrh <wa9vrh at wildblue.net> wrote:
> >
> > Hi Frank,
> > Have you tried using the 32V-2 on AM. For the Collins Collectors 1st
> Wednesday
> > AM net I have been using an Elmac AF-68 which runs less power than
> > your 32V-2. Might give the 32V-2 a try.
> > 73 Larry WA9VRH
> >
> >> On 1/12/2015 6:09 PM, FRANK HUGHES hughes wrote:
> >> Hi,
> >> I would like to be able to participate in some of the AM nets.
> >> My 32V-2 only makes 70 watts of carrier. (low voltage selected)
> >> I have a good condition Collins 30S-1 that I normally use for SSB.
> >> If the power is kept down to about 150 watts of carrier, could I drive
> the amp w/ the 32V-2?
> >>
> >>
> >> My first homebrew amp is under construction, but until it is ready, I
> am hoping to find a temporary
> >> solution.
> >> 73
> >> Frank
> >> KJ4OLL
> >> ______________________________________________________________
> >> Our Main Website: http://www.amfone.net
> >> AMRadio mailing list
> >> Archives: http://mailman.qth.net/pipermail/amradio/
> >> List Rules (must read!): http://w5ami.net/amradiofaq.html
> >> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> >> Post: AMRadio at mailman.qth.net
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> >> the word unsubscribe in the message body.
> >>
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> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> >
>
>
> ------------------------------
>
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> ------------------------------
>
> End of AMRadio Digest, Vol 132, Issue 7
> ***************************************
>


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