K3+XV144+XV432

[David Giles]

Hello All,

Can anyone please tell me the expected frequency ranges when using a K3 and
KXV3 transverter option with the XV144 and XV432 transverters?  Being a
satellite enthusiast I would need the K3+XV144 to operate from 145.8 to
146MHz and the K3+XV432 to operate from 432 to 438MHz.  Add another 2MHz on
top to each to work the local FM repeaters would be a bonus.

73 de David VK5DG
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[Tom-5]

David,

    I don 't think that for now Elecraft is going to come out with K3
version xvtrs. Maybe in the future. But their existing xvtrs are among
the best. However, they are meant for a 28 Mhz IF, and therein lies a
"problem". Normally, 28 MHz would become 144.0, so the K3 would need to
go 30.0 Mhz to get 146.00, for satellite work. The ten meter band stops
at 29.7 MHz of course. So this one is a simple firmware change. The real
problem in on 432, where 28 MHz will be 432, so a 435.3 sat signal would
be 31.3 MHz. I don't know if Elecraft will have firmware to let this
happen at the xvtr stage (1 milliwatt). What I have already looked at is
having two different crystals, with their own "tweaking" circuitry, one
for 432, and one for 435. The K2 has become a favorite IF rig for many
of the microwave boys, and I'm sure the K3 will be right there also.

    Here is the long term deal. I know Aptos will take care of the
problem. I believe that the K3 will became a favorite of many satellite
operators, and microwave folks. Heck, a favorite for everyone!. As such,
requests and concerns like this will be added to the 500+ item wish list
that I am sure exists right now. That is one continually amazing thing
about Elecraft, how they truly respond to what the customers want.

    Tom K8TB



David wrote:
> Hello All,
>
> Can anyone please tell me the expected frequency ranges when using a K3 and
> KXV3 transverter option with the XV144 and XV432 transverters?  Being a
> satellite enthusiast I would need the K3+XV144 to operate from 145.8 to
> 146MHz and the K3+XV432 to operate from 432 to 438MHz.  Add another 2MHz on
> top to each to work the local FM repeaters would be a bonus.
>
>  


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[johnny-52]

Hello David,

Being a XV144 user, I second your idea.  To deal with this, I do the MARS
modification for my IC7800 so as to give more coverage.  As I mentioned in
my previous postings in this reflector,  XV144 is good but not cheap in
terms of price.  Solely using it for SSB work is simply a waste.  I often
use it for casual FM work.

With the dual receiving ability of K3, the application of the transverters
should be more enhanced.

73

Johnny Siu VR2XMC


From: David <[hidden email]>
To: [hidden email]
Subject: [Elecraft] K3+XV144+XV432
Date: Tue, 29 May 2007 10:29:48 +0930

Hello All,

Can anyone please tell me the expected frequency ranges when using a K3 and
KXV3 transverter option with the XV144 and XV432 transverters?  Being a
satellite enthusiast I would need the K3+XV144 to operate from 145.8 to
146MHz and the K3+XV432 to operate from 432 to 438MHz.  Add another 2MHz on
top to each to work the local FM repeaters would be a bonus.

73 de David VK5DG

_________________________________________________________________
MSN 人氣搜尋，有齊城中熱門話題 http://www.msn.com.hk/hothits/default.asp 

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[dj7mgq]

What I would love to see, is the ability to use e.g. 32MHz to 42MHz as
the transverter IF. This would allow transverter operation from the same
QTH as a station operating on 28MHz and with a 10MHz wide IF you would
be able to cover the entire 70cm Band in ITU Region 1. The modification
of the XVs for something like this shouldn't be too difficult.

Here in DL, repeaters generally have a 600kHz shift on 2m and 7,6MHz on
70cm.

For FM repeaters here in DL, will the K3 be able to to transmit the
1750Hz tone, used to "open" the repeaters?

vy 73 de toby
--
DD5FZ, 4N6FZ (ex dj7mgq, dg5mgq, dd5fz)
K2 #885, K2/100 #3248
K3/100 #??? (< #200)
DOK C12, BCC, DL-QRP-AG
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[Ken_ke2n]

<quote author="David Giles">
>Hello All,
>Can anyone please tell me the expected frequency ranges when using a K3 and
>KXV3 transverter option with the XV144 and XV432 transverters?
<unquote>

Did this ever get answered?

I have a related question. I would like to listen on 216.99 with my 222/28 MHz transverter. I can tune down there and hear stuff (this is 22 MHz, within range of the 15 meter band on the K3.) Sensitivity down a bit, but it works.

The problem is that the K3 will not allow me to enter this frequency directly.  After spinning the dial a thousand times I arrived there and put the frequency in a memory.  Guess what? it will not accept the memorized frequency when I recall it.  Kicks me to 219.99 or so ...  what gives?

Ken

PS - I do not have the general coverage receiver, if that makes a difference.

-> update

I found I could fool the K3 by telling it I had a transverter (#8 here) that was 215 to 21 MHz. It still will not retrieve the 216 MHz frequency from memory properly but at least I have an A/B VFO that it "remembers" while I am using other bands.  The general question still stands: when you have a transverter, how big a range of frequencies are considered valid for direct frequency entry and  memory recall?

[N5GE]

On Fri, 21 Aug 2009 16:57:07 -0500 (CDT), Ken_ke2n <[hidden email]>
wrote:

>
>
>>Hello All,
>>Can anyone please tell me the expected frequency ranges when using a K3 and
>>KXV3 transverter option with the XV144 and XV432 transverters?
[snip]

xv144 range = 144 to 146Mhz
xv432 range = 432 to 434Mhz

I was confused by your second question.  The frequencies you asked
about are not covered by the xv144 and xv432.  Maybe some one else can
answer the second question.

Tom, N5GE

[hidden email]
K3 #806, K3 #1055, PR6,
XV144, XV432, KRC2,
W1 and other small kits.
http://www.n5ge.com
http://www.swotrc.net

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[Eric Swartz - WA6HHQ]

Try hitting A>B twice after setting up the CONFIG:XVn RF menu entry.

The first time you set up a new transverter band, you should force the
VFOs to both be in-band relative to each other.

73, Eric  WA6HHQ

_..._



Ken_ke2n wrote:

>
> I have a related question. I would like to listen on 216.99 with my 222/28
> MHz transverter. I can tune down there and hear stuff (this is 22 MHz,
> within range of the 15 meter band on the K3.) Sensitivity down a bit, but it
> works.
>
> The problem is that the K3 will not allow me to enter this frequency
> directly.  After spinning the dial a thousand times I arrived there and put
> the frequency in a memory.  Guess what? it will not accept the memorized
> frequency when I recall it.  Kicks me to 219.99 or so ...  what gives?
>
> Ken
>
> PS - I do not have the general coverage receiver, if that makes a
> difference.
>  

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[Ken_ke2n]

<quote author="Eric Swartz - WA6HHQ, Elecraft">
>>Try hitting A>B twice after setting up the CONFIG:XVn RF menu entry.

Thanks Eric, but that is not the problem - (by after I assume you mean after leaving the config menu)

I have both VFO's on 216.987 (more or less) but when I try to retrieve a value from the memory like 216.(anything) it forces the active VFO to 219.9992 (in USB).

That seems to be the lower limit of what the K3 finds "acceptable" for a RF=222 transverter when the frequency is entered all at once (memory or keypad+enterkey)

So it looks like there is a lower limit of 2 Mhz below the transverter frequency.*
See my other note. My fictitious 215/21 MHz transverter lets me use frequencies down to 212.999 - not lower.  The magic 2 MHz limit again.

The problem I am having with recalling a frequency now is that the K3 thinks the 216.987 frequency belongs to my transverter #3 (the real 222 transverter) and automatically switches to that band - and of course with that transverter defined as a 222 transverter, it will not accept the frequency.  

I think maybe I need to insert the fictitious one as transverter #3 and re-enter all the other ones up through 8.  But that is too much of a pain since I only need two frequencies I am happy with what is memorized in vfo A and B.

* I just thought it was really strange that I could tune the radio to that frequency, memorize it OK and then find that the radio refuses to use the stored frequency later ...