[Elecraft] K2: Connecting a Transverter?

Sat Sep 14 10:10:02 2002

Hi

I have done several transverter projects with the K2. The simplest method=
 is to use the Aux antenna in connector on the 160 meter module for the R=
x side and install an attenuator in the transverter to drop 1 or 2 watts =
to the level you need to drive the transverter. I used 3 watt MOS resisto=
rs to do this. I think I used 2 68 ohm and a 220 ohm in a pi network for =
about 15-18 db then set up the K2 transverter menu for 2 watts out for th=
e low level drive (you need ver 2.xx firmware for the transverter menu's)=
. =20

I built up the Tx-Rx switch using a similar circuit to the one in the KPA=
100 with the power fet on a small perf board that plugs into the transver=
ter connector on the K2 RF board. You could also use the amp keying circu=
it described on the web site

If you use the low level signals at the transverter connector you will st=
ill need to connect a dummy load to the antenna because the K2 will still=
 transmit. The transverter interface board that is in the works now will =
solve all of the problems and be a much cleaner solution to connecting tr=
ansverters and if the FCC approves the 60 meter band the board will have =
the circuitry for that also. This board will provide all of the low level=
 ins and outs and the new firmware will turn off the PA when a transverte=
r band is selected

Don Brown
KD5NDB

----- Original Message -----
From: [email protected]
Sent: Saturday, September 14, 2002 7:11 AM
To: [email protected]
Subject: [Elecraft] K2: Connecting a Transverter?

Hello.
I plan to connect my 70cm-Transverter to the K2.
I don=B4t like the idea of connecting it to the Ant1-jack and inserting a=
n attenuator.
Also I don=B4t like to connect the rx-path to Ant2.

My Transverter wants to =B4see=B4 only a few milliwatts for full power, h=
as separate jacks for
if- in /out.

So i think the best way to connect it are the XVTR IN/OUT-jacks.

Please correct me if  i=B4m wrong:

The AMP-Kit ( I don=B4t have one, just guessing) has everything to switch
a xvtr or amp to rx/tx.

Have a look at Appendix B , RF-Board, Sheet 3 of 4

There is an Xverter Interface (a sort of AMP-Kit?), which connects to
either side of W6 via Pins 5 & 3 of  J13.

If you open W6 and run the signal through  relays on the XVTR-Interface,
everything should be fine.
A circuit like that should be easy to be build.
Relay #1-position normal: rf runs from left side of W6 through the relay =
to the right side of W6.
Relay #1-position xvtr: rf runs to another relay#2 which connects to XVTR=
 in/out
to provide rx/tx.
Relay#2 switches the signal-path  to xvtr-out in case of tx and to xvtr-i=
n in case of rx.

One could supply power from outside the K2 to those relays to switch in &=
 out,
but i don=B4t like that idea.

I think there is no XVTR-Interface available at Elecraft.
I didn=B4t find a circuit in the elecfraft articles. Well, ok, the Amp-ki=
t...., but....

Did someone build a circuit like that?

----And most important:----

Is the K2-software capable of switching  relays in/out on the interface a=
nd leave
relay #1 in the correct positions, as long as TRANSVERTER ON is selected,
and toggle relay #2  rx/tx?
If not, please Elecraft, think of a Software Update.

73,
Martin
K2 #2706

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