Transverter question

[Peter Pauly]

The datasheet for Elecraft's external transverter says that the IF
frequency is 28-30 Mhz. Does that mean it only supports 144Mhz to 146 Mhz?

What about other-branded transverters like the Down East Microwave? Can
they do the full 144Mhz -- 148 Mhz with the K3/K3S?
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[Bob McGraw - K4TAX]

The transverter range depends solely on the IF range.  I use DownEast
Microwave transverters and they only cover 2 MHz of the band because
that is the coverage of the K3S being 28 - 30 MHz.

Yes, one can get a different crystal for the DEM to allow covering the
upper end of the 2M band {146 - 148 MHz} but then it won't cover the
lower 2 MHz {144 - 146 MHz}

73
Bob, K4TAX

On 11/22/2015 3:55 PM, Peter Pauly wrote:
> What about other-branded transverters like the Down East Microwave? Can
> they do the full 144Mhz -- 148 Mhz with the K3/K3S?


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[Don Wilhelm-4]

Peter,

The XV144 was designed when the K2 was the primary intended driving
transceiver (the K2 did not tune above 30 MHz), and the XV144 design
point was primarily for CW and SSB operation on the low end of the band.
Since the K2 did not tune above 30 MHz (and did not do FM), there was
not much interest in having the XV144 output to be above 146MHz.
Enter the K3 with its FM capability and tuning above 30MHz and the
picture becomes "cloudy".

I do not know the range of the 28MHz nor the 144MHz bandpass filters in
the XV144, so I cannot directly answer your question.
Certainly the XV144 could be tuned to provide whatever coverage of the 2
meter band that you choose, but I do not know if the bandpass is
sufficiently wide to cover the entire band with full power output or
full RX sensitivity.

73,
Don W3FPR

On 11/22/2015 4:55 PM, Peter Pauly wrote:
> The datasheet for Elecraft's external transverter says that the IF
> frequency is 28-30 Mhz. Does that mean it only supports 144Mhz to 146 Mhz?
>
> What about other-branded transverters like the Down East Microwave? Can
> they do the full 144Mhz -- 148 Mhz with the K3/K3S?
>

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[Bill Frantz]

The internal 2M transverter, the K144XV, has a relay which
switches it between 144-146 MHz and 146-148 MHz, so it can cover
the whole band. The manual recommends against scanning over the
146 MHz boundary to save the relay from overuse. If you need
full 2M coverage, it is a good option.

73 Bill AE6JV

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[Edward R Cole]

I use DEMI transverters and they are capable operating over 4-MHz on
2m.  The issue is with the K3 Tx power which falls off quickly above
30-MHz.  I am unable to have enough drive at 30.52 MHz to get more
than 5w out of my 50w transverter on 146.52-MHz.

One could install a second oscillator with a 118-MHz xtal to cover
146-148.  The DEMI transverter receives 144-148 because the K3 will
tune to 32 MHz in transverter mode.  Apparently the Elecraft
transverter has a dual frequency LO.

73, Ed - KL7UW

Date: Sun, 22 Nov 2015 16:55:17 -0500
From: Peter Pauly <[hidden email]>
To: Elecraft Reflector <[hidden email]>
Subject: [Elecraft] Transverter question

The datasheet for Elecraft's external transverter says that the IF
frequency is 28-30 Mhz. Does that mean it only supports 144Mhz to 146 Mhz?

What about other-branded transverters like the Down East Microwave? Can
they do the full 144Mhz -- 148 Mhz with the K3/K3S?


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

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[Charlie T, K3ICH]

I changed the heterodyne crystal in my old
MicroWave Modules 220-28 to use 27 MHz as the low
end IF.  That way I can cover the whole 3 MHz of
the "new" 1¼M band from 222 to 225 MHz.

Admittedly, I have not yet tried it with my new
K3s, but with the original K3, Elecraft sent me a
program to allow transverter ( low level ) output
down into the chicken band.

The program may allow output down to 26 MHz which
may also solve the problem of the 4 MHz wide 2M
band.

I don't think the program would allow any
significant power output at 27 MHz, but it was
perfect for my needs.  I sold my K3, so I need to
ask them again for that program so I can get my
new K3s working on the 220 ( I still call it that)
band.

As an aside, I don't think anything ever came of
that total guvmint  fiasco where 220 to 222 was
taken out of HAM service but we were give some
space below 220 to use. (Bloody ridiculous) Now do
you see why many of us want them out of our lives
as much as possible?

73, Charlie k3ICH

 




-----Original Message-----
From: Elecraft
[mailto:[hidden email]] On
Behalf Of Edward R Cole
Sent: Monday, November 23, 2015 5:50 AM
To: [hidden email]
Subject: Re: [Elecraft] Transverter question

I use DEMI transverters and they are capable
operating over 4-MHz on 2m.  The issue is with the
K3 Tx power which falls off quickly above 30-MHz.
I am unable to have enough drive at 30.52 MHz to
get more than 5w out of my 50w transverter on
146.52-MHz.

One could install a second oscillator with a
118-MHz xtal to cover 146-148.  The DEMI
transverter receives 144-148 because the K3 will
tune to 32 MHz in transverter mode.  Apparently
the Elecraft transverter has a dual frequency LO.

73, Ed - KL7UW



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[Edward R Cole]

Charlie,

Hopefully, you do not have any signal leakage at 27-MHz to create Rx problems.

I'm using a L222-28 DEMI transverter and tunes 222-225 for Rx with no
issue.  All activity is centered on 223.50 calling frequency with
exception of one repeater:  input is 223.34 and output is 224.94 so
28-30 covers what I transmit since 224.94 is Rx.  I also can transmit
222.100 CW/SSB but hardly any stations with other than FM up here.

I only use my transverter at low level output (5mw) to drive a 150w
surplus amp (which was originally destined for the now defunct 220
service).  My two ancient CC 220-11 yagis at 60-foot make working the
stations in Anchorage 65+ miles north of me possible.  Most of them
run 20w FM rigs with mere vertical whips.  Mostly there are four of
us that have regular contacts: KL7XJ, KL6M, KL4E, and myself.  We use
is as sort-of intercom for coordination of other bands.

Presence on 222 does add a band multiplier in VHF contests.

73, Ed - KL7UW

Date: Mon, 23 Nov 2015 08:10:07 -0500
From: "Charlie T, K3ICH" <[hidden email]>
To: <[hidden email]>
Subject: Re: [Elecraft] Transverter question
Message-ID: <002601d125f0$4ac3f4f0$e04bded0$@erols.com>
Content-Type: text/plain;       charset="iso-8859-1"

I changed the heterodyne crystal in my old
MicroWave Modules 220-28 to use 27 MHz as the low
end IF.  That way I can cover the whole 3 MHz of
the "new" 1?M band from 222 to 225 MHz.



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

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