Harris Channel 11 VHF TV Amplifier Modules - IMMEDIATE ATTENTION REQUIRED

[W7GJ, Lance]

Hello!

I just received a telephone call from Thomas Bohnet in Fairbanks, AK.  He is the
chief engineer for a broadcasting company up there, and is about to send 18 of these
Harris amplifier modules to the dump for scrap.   They are part number 992-8969-011,
and are supposedly built to operate between 174-230 MHz without any modifications.  I
don't know what the output would be at 2m with the units as-is, or what it might take
to tweak them to 2m.  He told me he thought each unit was tuned to put out around
500w, which seems consistent with the Channel 2/6m Harris Platinum I amps with which
I have dealt.  With the Channel 2 units, 10w drive typically resulted in close to 1
kw output.

Thomas said he would prefer if someone would purchase all 18 units from him, but he
would consider selling fewer units in the interest of trying to prevent these
valuable pieces from going to the dump.   If you agree to take all 18, the cost would
be closer to $100 each (plus bulk pallet shipping).   If you only wanted a one or
two, the cost would be closer to $200 each plus UPS boxing and shipping (which I
generally found to be around $100 here). I am sure you could run a pair of these in
parallel (as I described on my web page for the Channel 2 units), if you wanted to
make sure they would handle the legal limit, and 50 VDC power supplies are very
readily available:

http://www.bigskyspaces.com/w7gj/HarrisAmps.htm

I have no involvement in this, and cannot provide any further information.  I am
simply trying to help Thomas save these amps from the dump. If you have an interest
in a solid state .5 to 1 kw amp, please contact Thomas directly ASAP at telephone
number 907 322-1985.  He advised me that they will be disposed of for scrap in the
next couple of days if no hams step forward to put them to use.

GL and VY 73, Lance

--
Lance Collister, W7GJ
(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M, TX5K)
P.O. Box 73
Frenchtown, MT   59834-0073
USA
TEL: [phone]
QTH: DN27ub
URL: http://www.bigskyspaces.com/w7gj
Windows Messenger: [hidden email]
Skype: lanceW7GJ
2m DXCC #11/6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the Magic Band EME
email group, or just fill in the request box at the bottom of my web
page (above)!

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[Edward R Cole]

Lance,

Wow...and I cannot do it, darn!  But I have my ch.2 Platinum for
6m.  What perked my attention was the freq range of 174-230
MHz.  That ought to be perfect for 222-eme!

I sure hope someone can step forward to accept a few (or all) of these.

Meanwhile I am working on my next two eme bands: 1296 and 50 MHz.

73, Ed - KL7UW

At 01:25 PM 8/16/2013, Lance Collister, W7GJ wrote:

>Hello!
>
>I just received a telephone call from Thomas Bohnet in Fairbanks,
>AK.  He is the chief engineer for a broadcasting company up there,
>and is about to send 18 of these Harris amplifier modules to the
>dump for scrap.   They are part number 992-8969-011, and are
>supposedly built to operate between 174-230 MHz without any
>modifications.  I don't know what the output would be at 2m with the
>units as-is, or what it might take to tweak them to 2m.  He told me
>he thought each unit was tuned to put out around 500w, which seems
>consistent with the Channel 2/6m Harris Platinum I amps with which I
>have dealt.  With the Channel 2 units, 10w drive typically resulted
>in close to 1 kw output.
>
>Thomas said he would prefer if someone would purchase all 18 units
>from him, but he would consider selling fewer units in the interest
>of trying to prevent these valuable pieces from going to the
>dump.   If you agree to take all 18, the cost would be closer to
>$100 each (plus bulk pallet shipping).   If you only wanted a one or
>two, the cost would be closer to $200 each plus UPS boxing and
>shipping (which I generally found to be around $100 here). I am sure
>you could run a pair of these in parallel (as I described on my web
>page for the Channel 2 units), if you wanted to make sure they would
>handle the legal limit, and 50 VDC power supplies are very readily available:
>
>http://www.bigskyspaces.com/w7gj/HarrisAmps.htm
>
>I have no involvement in this, and cannot provide any further
>information.  I am simply trying to help Thomas save these amps from
>the dump. If you have an interest in a solid state .5 to 1 kw amp,
>please contact Thomas directly ASAP at telephone number 907
>322-1985.  He advised me that they will be disposed of for scrap in
>the next couple of days if no hams step forward to put them to use.
>
>GL and VY 73, Lance
>
>--
>Lance Collister, W7GJ
>(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M, TX5K)
>P.O. Box 73
>Frenchtown, MT   59834-0073
>USA
>TEL: [phone]
>QTH: DN27ub
>URL: http://www.bigskyspaces.com/w7gj
>Windows Messenger: [hidden email]
>Skype: lanceW7GJ
>2m DXCC #11/6m DXCC #815
>
>Interested in 6m EME?  Ask me about subscribing to the Magic Band EME
>email group, or just fill in the request box at the bottom of my web
>page (above)!
>
>--
>~The Voice of the Pacific NorthWest VHF Society~
>You received this message because you are subscribed to the Google
>Groups "PNWVHFS" group.
>To post to this group, send email to [hidden email]
>To unsubscribe from this group, send email to
>[hidden email]
>For more options, visit this group at http://groups.google.com/group/PNWVHFS
>--- You received this message because you are subscribed to the
>Google Groups "PNWVHFS" group.
>To unsubscribe from this group and stop receiving emails from it,
>send an email to [hidden email].
>For more options, visit https://groups.google.com/groups/opt_out.

73, Ed - KL7UW
http://www.kl7uw.com
[hidden email]
"Kits made by KL7UW"

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[AD6XY]

I have two of these sub modules. They will convert to 144MHz with a little effort and some small expenditure on 25 ohm coax. They make great amplifiers, I have one modified and run it up to 400W output on 144MHz, but you will need to keep spares as the PA devices are custom. Of course they would work unmodified on the 220MHz band and maybe that's the best option. The trays of 4 modules make 1500W.

A note of caution, I paid about $200 each for mine and at the time it was a very good deal. I was intending to combine them to make an 800W amplifier, but then the MRFE6VP61K25H design appeared in Dubus. With that design you have nearly 1kW linear output from one device for not a lot more money than I had paid for two modules and without any of the fuss of combining them or the potential lack of spares should a device fail. Jim, W6PQL makes kits for the MRFE6VP61K25H and I suppose its about $600 to get you to the same point you would be with two Harris modules.

So, although $600 is a lot more than $400. all of the casing, filtering, protection, TX/RX switching and so on still needs to be done for either amplifier. Once you build it you realise the power module is only half of the job and you need to budget another $500 to finish the job, the saving from surplus modules doesn't look so attractive.

Where it is attractive is if you need much more power than the 900W you can get from the MRFE6VP61K25H, say for EME running a high duty cycle mode like JT65. Then 8 modules will give you a "conservative" 1500W at the feed. It makes more sense for one or two people to get together and take all in one go.

Always a pity to see nice RF hardware scrapped.

Mike G0MJW/AD6XY

[tomb18]

Hmmm can't be too many scrap yards up there...
Seriously if he's going to scrap them why ask so much?

Sent from my iPhone

On 2013-08-16, at 6:07 PM, Edward R Cole <[hidden email]> wrote:

> Lance,
>
> Wow...and I cannot do it, darn!  But I have my ch.2 Platinum for 6m.  What perked my attention was the freq range of 174-230 MHz.  That ought to be perfect for 222-eme!
>
> I sure hope someone can step forward to accept a few (or all) of these.
>
> Meanwhile I am working on my next two eme bands: 1296 and 50 MHz.
>
> 73, Ed - KL7UW
>
> At 01:25 PM 8/16/2013, Lance Collister, W7GJ wrote:
>> Hello!
>>
>> I just received a telephone call from Thomas Bohnet in Fairbanks, AK.  He is the chief engineer for a broadcasting company up there, and is about to send 18 of these Harris amplifier modules to the dump for scrap.   They are part number 992-8969-011, and are supposedly built to operate between 174-230 MHz without any modifications.  I don't know what the output would be at 2m with the units as-is, or what it might take to tweak them to 2m.  He told me he thought each unit was tuned to put out around 500w, which seems consistent with the Channel 2/6m Harris Platinum I amps with which I have dealt.  With the Channel 2 units, 10w drive typically resulted in close to 1 kw output.
>>
>> Thomas said he would prefer if someone would purchase all 18 units from him, but he would consider selling fewer units in the interest of trying to prevent these valuable pieces from going to the dump.   If you agree to take all 18, the cost would be closer to $100 each (plus bulk pallet shipping).   If you only wanted a one or two, the cost would be closer to $200 each plus UPS boxing and shipping (which I generally found to be around $100 here). I am sure you could run a pair of these in parallel (as I described on my web page for the Channel 2 units), if you wanted to make sure they would handle the legal limit, and 50 VDC power supplies are very readily available:
>>
>> http://www.bigskyspaces.com/w7gj/HarrisAmps.htm
>>
>> I have no involvement in this, and cannot provide any further information.  I am simply trying to help Thomas save these amps from the dump. If you have an interest in a solid state .5 to 1 kw amp, please contact Thomas directly ASAP at telephone number 907 322-1985.  He advised me that they will be disposed of for scrap in the next couple of days if no hams step forward to put them to use.
>>
>> GL and VY 73, Lance
>>
>> --
>> Lance Collister, W7GJ
>> (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M, TX5K)
>> P.O. Box 73
>> Frenchtown, MT   59834-0073
>> USA
>> TEL: [phone]
>> QTH: DN27ub
>> URL: http://www.bigskyspaces.com/w7gj
>> Windows Messenger: [hidden email]
>> Skype: lanceW7GJ
>> 2m DXCC #11/6m DXCC #815
>>
>> Interested in 6m EME?  Ask me about subscribing to the Magic Band EME
>> email group, or just fill in the request box at the bottom of my web
>> page (above)!
>>
>> --
>> ~The Voice of the Pacific NorthWest VHF Society~
>> You received this message because you are subscribed to the Google Groups "PNWVHFS" group.
>> To post to this group, send email to [hidden email]
>> To unsubscribe from this group, send email to [hidden email]
>> For more options, visit this group at http://groups.google.com/group/PNWVHFS
>> --- You received this message because you are subscribed to the Google Groups "PNWVHFS" group.
>> To unsubscribe from this group and stop receiving emails from it, send an email to [hidden email].
>> For more options, visit https://groups.google.com/groups/opt_out.
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
> [hidden email]
> "Kits made by KL7UW"
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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[Edward R Cole]

Tom,

$100 for a 1100w amplifier.  Seems like a bargain to me.  A guess
they were $5-10K brand new.  Each has 16 MRF-150 (equivalents) in
them.  10w drive typically results in 1000-1100w.  All that is need
is a 50v 40-50A PS.  Those are common on ebay for $30.

Probably the TV station cannot give them away.  Lots of companies
have such policies but can dispose them.  Maybe if you could be at
the junk yard to pick them up, you could get better price (that will
be in Fairbanks, AK!).

Wish I had the funds for one.  Wish I had $1800 to invest, I would
buy all and sell them for $800/ea. and do it easily.

73, Ed - KL7UW

At 05:47 PM 8/16/2013, Tom wrote:

>Hmmm can't be too many scrap yards up there...
>Seriously if he's going to scrap them why ask so much?
>
>Sent from my iPhone
>
>On 2013-08-16, at 6:07 PM, Edward R Cole <[hidden email]> wrote:
>
> > Lance,
> >
> > Wow...and I cannot do it, darn!  But I have my ch.2 Platinum for
> 6m.  What perked my attention was the freq range of 174-230
> MHz.  That ought to be perfect for 222-eme!
> >
> > I sure hope someone can step forward to accept a few (or all) of these.
> >
> > Meanwhile I am working on my next two eme bands: 1296 and 50 MHz.
> >
> > 73, Ed - KL7UW
> >
> > At 01:25 PM 8/16/2013, Lance Collister, W7GJ wrote:
> >> Hello!
> >>
> >> I just received a telephone call from Thomas Bohnet in
> Fairbanks, AK.  He is the chief engineer for a broadcasting company
> up there, and is about to send 18 of these Harris amplifier modules
> to the dump for scrap.   They are part number 992-8969-011, and are
> supposedly built to operate between 174-230 MHz without any
> modifications.  I don't know what the output would be at 2m with
> the units as-is, or what it might take to tweak them to 2m.  He
> told me he thought each unit was tuned to put out around 500w,
> which seems consistent with the Channel 2/6m Harris Platinum I amps
> with which I have dealt.  With the Channel 2 units, 10w drive
> typically resulted in close to 1 kw output.
> >>
> >> Thomas said he would prefer if someone would purchase all 18
> units from him, but he would consider selling fewer units in the
> interest of trying to prevent these valuable pieces from going to
> the dump.   If you agree to take all 18, the cost would be closer
> to $100 each (plus bulk pallet shipping).   If you only wanted a
> one or two, the cost would be closer to $200 each plus UPS boxing
> and shipping (which I generally found to be around $100 here). I am
> sure you could run a pair of these in parallel (as I described on
> my web page for the Channel 2 units), if you wanted to make sure
> they would handle the legal limit, and 50 VDC power supplies are
> very readily available:
> >>
> >> http://www.bigskyspaces.com/w7gj/HarrisAmps.htm
> >>
> >> I have no involvement in this, and cannot provide any further
> information.  I am simply trying to help Thomas save these amps
> from the dump. If you have an interest in a solid state .5 to 1 kw
> amp, please contact Thomas directly ASAP at telephone number 907
> 322-1985.  He advised me that they will be disposed of for scrap in
> the next couple of days if no hams step forward to put them to use.
> >>
> >> GL and VY 73, Lance
> >>
> >> --
> >> Lance Collister, W7GJ
> >> (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ,
> E6M, TX5K)
> >> P.O. Box 73
> >> Frenchtown, MT   59834-0073
> >> USA
> >> TEL: [phone]
> >> QTH: DN27ub
> >> URL: http://www.bigskyspaces.com/w7gj
> >> Windows Messenger: [hidden email]
> >> Skype: lanceW7GJ
> >> 2m DXCC #11/6m DXCC #815
> >>
> >> Interested in 6m EME?  Ask me about subscribing to the Magic Band EME
> >> email group, or just fill in the request box at the bottom of my web
> >> page (above)!
> >>
> >> --
> >> ~The Voice of the Pacific NorthWest VHF Society~
> >> You received this message because you are subscribed to the
> Google Groups "PNWVHFS" group.
> >> To post to this group, send email to [hidden email]
> >> To unsubscribe from this group, send email to
> [hidden email]
> >> For more options, visit this group at
> http://groups.google.com/group/PNWVHFS
> >> --- You received this message because you are subscribed to the
> Google Groups "PNWVHFS" group.
> >> To unsubscribe from this group and stop receiving emails from
> it, send an email to [hidden email].
> >> For more options, visit https://groups.google.com/groups/opt_out.
> >
> > 73, Ed - KL7UW
> > http://www.kl7uw.com
> > [hidden email]
> > "Kits made by KL7UW"
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html

73, Ed - KL7UW
http://www.kl7uw.com
[hidden email]
"Kits made by KL7UW"

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