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Re: Re: 2m to 70cm upconverter design, any interrest ??



Down East Microwave stocks crystals for VHF, UHF and SHF transverters for
the satellite and weak-signal sub-bands using 28 and 144 MHz IFs. They are
meant for use with the DEM transverters but will work with other designs.
The price is usually less than ordering a custom-made crystal and the 1-3
week lead time for manufacturing is avoided.

73,

John
KD6OZH

----- Original Message -----
From: "i8cvs" <domenico.i8cvs@tin.it>
To: "Andy Brian" <briaandy@gmail.com>
Cc: "AMSAT-BB" <amsat-bb@amsat.org>
Sent: Saturday, June 25, 2005 23:00 UTC
Subject: Re: [amsat-bb] Re: 2m to 70cm upconverter design, any interrest ??


> Hi Endy
>
> If you plan to use the KA9LNV transverter as a transmit converter for
VO-52
> from 435.225 to 435.275 MHz than the 101.875 MHz crystal is not suitable
> with an IF 28 to 30 MHz because 101.875 x 4 = 407.500 MHz and
> 407.500 + 28 = 435.500 MHz
>
> In place of it you should use a 101.750 MHz crystal because
> 101.750 x 4 = 407.000 MHz and 407.000 + 28 = 435.000 MHz so that
> you can cover 435.0 to 437.0 MHz with an IF from 28 to 30 MHz
>
> A good crystal manufacturer in USA is ICM and I suggest to contact this
> people showing the schematic diagram of the circuit in wich the above
> mentioned series resonant fifth overtone crystal must oscillate.
>
> In any case the second part of the article published by K9LNV in QST
> september 1991 covers in details the crystal-frequency selection and IF
> interfacing.
>
> 73" de
>
> i8CVS Domenico
>
>
> ----- Original Message -----
> From: "Andy Brian" <briaandy@gmail.com>
> To: "i8cvs" <domenico.i8cvs@tin.it>
> Cc: "AMSAT-BB" <amsat-bb@amsat.org>
> Sent: Saturday, June 25, 2005 10:58 PM
> Subject: Re: [amsat-bb] Re: 2m to 70cm upconverter design, any interrest
??
>
>
> > Hi,
> >
> >
> > I know about that converter which was published in QST, the author was
> > KA9LNV.
> > The main problem for many of homebrewer were the local oscillator or
> better the
> > crystal 101.875MHz, the  problem was to get them somewhere.
> > Maybe any suggestion to take any similar crystal?
> >
> >
> > best regards Andy
> >
> > On 6/25/05, i8cvs <domenico.i8cvs@tin.it> wrote:
> > > Hi Andy
> > >
> > > If you've been thinking of making the move up to the 70 cm learning
> > > someting more about RF in the UHF field with inexpencive construction
> > > and using your old HF 10 meters equipments than the 70 cm transverter
> > > described by Ed Krome, WA9LNV in QST august 1991 and september
> > > 1991 is a good way to do so.
> > > Look at it in the QST cover
> > > The above transverter with IF 28-30 MHz for in/out is designed to
> > > be built dead-bug style on pieces of doubled-sided, unetched printed
> > > circuit board and so no conventional PCB with striplines is required.
> > > In addition inexpencive readily available MMIC and transistors are
> > > used.
> > > The above transverter is built in three different sections:
> > > Xtal local oscillator
> > > Receive converter
> > > transmit converter
> > > If one don't need it to receive than simply forget the receive
converter
> > > or vice versa
> > > I am using it as a receiving converter and it works great.
> > > To duplicate the above transverter is very easy because the Ed's
article
> > > explain everyting step by step and reading it is very informative.
> > >
> > > If any one like a copy of the above article I can send it by email.
> > >
> > > 73" de
> > >
> > > i8CVS Domenico
> > >
> > > ----- Original Message -----
> > > From: "Andy Brian" <briaandy@gmail.com>
> > > To: <amsat-bb@amsat.org>
> > > Sent: Saturday, June 25, 2005 12:22 PM
> > > Subject: [amsat-bb] Re: 2m to 70cm upconverter design, any interrest
??
> > >
> > >
> > > > Hi,
> > > >
> > > >
> > > > if you want to help with cheap and simple converter is the best
choice
> to
> > > > publish this converter in plain format for homebrewers etc. circuit
> > > > diagrams and PCB at your homepages
> > > >
> > > > because the electronical elements is inexpensive in Asia and some
> others
> > > > countries.
> > > >
> > > > This is my opinion, I know this is your hard job and you want to
help
> us,
> > > > but I think this converter won't bring you money for your job.
> > > >
> > > >
> > > > best regards Andy
> > > > > >>-----Original Message-----
> > > > > >>From: William Leijenaar <pe1rah@yahoo.com>
> > > > > >>Sent: Jun 23, 2005 3:08 PM
> > > > > >>To: amsat-bb@AMSAT.Org
> > > > > >>Subject: [amsat-bb] 2m to 70cm upconverter design, any interrest
> ??
> > > > > >>
> > > > > >>Hi AMSATs,
> > > > > >>
> > > > > >>To get on the 70cm HAMSAT uplink is not easy for many
> > > > > >>hams in the world. FM handies are available, but other
> > > > > >>modes than FM is very rare and to expensive for those
> > > > > >>hams.
> > > > > >>
> > > > > >>To get them on 70cm ssb the best way is to use an
> > > > > >>upconverter from their widely available HF. With use
> > > > > >>of an upconverter an 10m ssb signal will be converted
> > > > > >>into an 70cm ssb signal and can be used for HAMSATs
> > > > > >>uplink.
> > > > > >>With use of a 2m to HF down-converter the same HF can
> > > > > >>be used for receiving the HAMSATs ssb downlink.
> > > > > >>
> > > > > >>I have been looking around the web to find available
> > > > > >>converters. For 2m to 10m down-converters there are
> > > > > >>several options, with good prices. Unfortunatly for
> > > > > >>10m to 70cm up-converters there is very little
> > > > > >>available and with high prices.
> > > > > >>
> > > > > >>Because of this I have been working on a cheap and
> > > > > >>simpel to make design. After some weeks testing and
> > > > > >>experimenting I got something on the test bench.
> > > > > >>
> > > > > >>The prototype can be seen on my webpage:
> > > > > >>www.qsl.net/pe1rah/10m70cm.htm
> > > > > >>
> > > > > >>or via my main page:
> > > > > >>www.qsl.net/pe1rah
> > > > > >>
> > > > > >>The features of the design are:
> > > > > >>-------------------------------
> > > > > >>* Made on a PCB
> > > > > >>* In a metal box (74mm x 148mm x 30mm)
> > > > > >>* 407MHz local oscillator build in
> > > > > >>* 12Vdc power supply
> > > > > >>* 50mW output on 70cm (enough to drive M57716 10W
> > > > > >>power module)
> > > > > >>* 28MHz BNC input, 70cm BNC output
> > > > > >>* Unwanted suppression >40dB
> > > > > >>* No exotic components
> > > > > >>
> > > > > >>When there is enough interrest I will deliver kits and
> > > > > >>complete constructed converters.
> > > > > >>
> > > > > >>I can not deliver it for a price less than below:
> > > > > >>-------------------------------------------------
> > > > > >>Kits              = 175 USD (+ shipping costs)
> > > > > >>Complete build    = 250 USD (+ shipping costs)
> > > > > >>
> > > > > >>!!! Please note that this is a complete TX
> > > > > >>upconverter, included PCB, Crystal, metal box, BNC
> > > > > >>connectors etc etc
> > > > > >>!!! The only thing needed to be qrv on HAMSAT 70cm
> > > > > >>uplink is a final amplifier.
> > > > > >>!!! Best solution is a M57716 module that give 10W
> > > > > >>output at the 50mW input.
> > > > > >>
> > > > > >>Let me know if there is any interrest,
> > > > > >>
> > > > > >>73,
> > > > > >>William Leijenaar
> > > > > >>PE1RAH
> > ----
> > Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> > Not an AMSAT member? Join now to support the amateur satellite program!
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
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