[K3] K3, P3E, Transverters (Satellites)

[Simon (HB9DRV)]

Has anyone thought about a K3-based solution for P3E or the American Eagle?

How would you get to 13cms / 23cms with the K3?

Simon Brown, HB9DRV
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[KK7P]

> How would you get to 13cms / 23cms with the K3?

For L-band uplink, Down East Microwave
<URL:http://www.downeastmicrowave.com > has several options available,
including some recent products that work directly from a 28 MHz IF.
They also offer S-band transverters with a 2m IF.

DB6NT-designed transverters are available from < http://www.ssbusa.com >
or < URL:http://www.kuhne-electronic.de/english/transverter.htm >.

These are all low-volume producers, so I suspect they would entertain
slight modifications of their designs for the proposed frequencies for
P3E and Eagle, as well as the possibility of using 6m for an IF to
eliminate the need to an intervening 144 MHz transverter.

73,

Lyle KK7P

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[michael taylor-3]

On 10/29/07, Lyle Johnson <[hidden email]> wrote:
> These are all low-volume producers, so I suspect they would entertain
> slight modifications of their designs for the proposed frequencies for
> P3E and Eagle, as well as the possibility of using 6m for an IF to
> eliminate the need to an intervening 144 MHz transverter.

Maybe wait for future K3 VHF/UHF modules?
Perhaps a KM1 weak signals oriented (CW, SSB) DSP based VHF to
microwave transceiver? Maybe vaguely similar to Bob W7PUA's DSP-10 2m
SDR/DSP transceiver. :-)

-Michael Taylor, VE3TIX
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[KK7P]

> Maybe wait for future K3 VHF/UHF modules?
> Perhaps a KM1 weak signals oriented (CW, SSB) DSP based VHF to
> microwave transceiver? Maybe vaguely similar to Bob W7PUA's DSP-10 2m
> SDR/DSP transceiver. :-)

One of the problems with gear for 900 MHz and higher is that you really
want the RF deck mounted at the antenna, if possible.  A weatherproof
transverter, if you will.  Feedlines affordable to most of us have too
much loss.  AN alternative is to remote a preamp and power amp, and let
the feedline loss attenuate the Tx output of the shack-based exciter to
the drive level needed by the power amp at the antenna.

With satellites, you often have a situation where you only want/need a
Tx or an Rx converter.  L band for satellites in the Amateur Service are
restricted to 1268-1270 MHz, uplink (transmit) only.  Until now, S-band
(2.4 GHz) has been downlink (receive) only.  So traditional transverters
may not be the most cost effective solution.  For VHF/UHF this is not
the case, where 2m and 70cm are used for both up- and downlink and
feedline losses are manageable (even if the antennas aren't!).

Another consideration is full duplex operation for satellites, which
suggests you want different IFs for Tx and Rx.  Finally, you probably
want VHF IFs for microwave operation for image rejection if nothing else.

73,

Lyle KK7P

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[Samuel Strongin]

  Rubbish I run all my transverters and power amps right through 3456Mhz in
the shack with great results , On 3456 a single loop yagi has 112 elements
is 12 feet long and has about 23dbm gain with mast mount preampsresults are
excellent. More important is the correct installation of connectors to keep
loss to a minimum. Try putting a 200 watt 2304 amp on the tower,ain't going
to happen.
                              73 kf4yox
----- Original Message -----
From: "Lyle Johnson" <[hidden email]>
To: "michael taylor" <[hidden email]>
Cc: "Elecraft" <[hidden email]>
Sent: Monday, October 29, 2007 4:14 PM
Subject: Re: [Elecraft] [K3] K3, P3E, Transverters (Satellites)

>> Maybe wait for future K3 VHF/UHF modules?
>> Perhaps a KM1 weak signals oriented (CW, SSB) DSP based VHF to
>> microwave transceiver? Maybe vaguely similar to Bob W7PUA's DSP-10 2m
>> SDR/DSP transceiver. :-)
>
> One of the problems with gear for 900 MHz and higher is that you really
> want the RF deck mounted at the antenna, if possible.  A weatherproof
> transverter, if you will.  Feedlines affordable to most of us have too
> much loss.  AN alternative is to remote a preamp and power amp, and let
> the feedline loss attenuate the Tx output of the shack-based exciter to
> the drive level needed by the power amp at the antenna.
>
> With satellites, you often have a situation where you only want/need a Tx
> or an Rx converter.  L band for satellites in the Amateur Service are
> restricted to 1268-1270 MHz, uplink (transmit) only.  Until now, S-band
> (2.4 GHz) has been downlink (receive) only.  So traditional transverters
> may not be the most cost effective solution.  For VHF/UHF this is not the
> case, where 2m and 70cm are used for both up- and downlink and feedline
> losses are manageable (even if the antennas aren't!).
>
> Another consideration is full duplex operation for satellites, which
> suggests you want different IFs for Tx and Rx.  Finally, you probably want
> VHF IFs for microwave operation for image rejection if nothing else.
>
> 73,
>
> Lyle KK7P
>
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[Simon (HB9DRV)]

How long are your coax runs? In my case I would much prefer to mount on the
dish as it's on the balcony (or in summer is down in the garden) and is not
far away. It would save money on high-spec co-ax as well.

I'm not trying to melt the satellites, rather just have a QSO :-)

Pic of my place: http://www.hb9drv.ch/hrd%20hq.jpg (I am the guy with the
aerials).

Simon Brown, HB9DRV

----- Original Message -----
From: "Samuel Strongin" <[hidden email]>


>  I run all my transverters and power amps right through 3456Mhz in the
> shack with great results.

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