Hi Tom,
What i don't understand: We've already been in QSO on LF and MF. So you
are already QRV. So why do you want to build such a complex, heavy, big
and power consuming system to drive the PA?
I would understand if you need something else than a big HF TRX plus
additional divider circuit. Maybe a small compact VFO, power saving,
for /p experiments.
Or, have there been some housebreakers in your shack?
All the best.
Stefan
Am 31.01.2015 17:05, schrieb DK1IS:
Hi Pete,
thanks for the splendid idea - obviously I did´nt see the wood for the
trees, all the more everything needed for this approach is already in
use here! I´ve a switchable devider by 10 for MF and by 100 for LF with
my marine radio exciter Hagenuk EX1001. Indeed this unit could bring
out the frequencies directly but with a resolution of only 100 Hz. So I
let it run at 13.6 MHz resp. 4.73 MHz. DFCW is possible too with
suitable choosen F1B shifts in the base bands.
So all I have to do is changing the input of the devider from the
EX1001 to the full range TXing Kenwood sets (attenuator added ;-))!
WSPR and DFCW should be possible too in SSB mode with suitable AF
modulation.
Thanks for the PA schematic too - it will be useful for future portable
activities.
Tu es 73,
Tom, DK1IS
Am 31.01.2015 um 11:35 schrieb M0FMT:
Hi Tom
Nice array of rigs I also own a TS50 plus a TS690s quite good on the RX side at M/LF the TS50 lacks the RX filtering of the other rig.
My suggestion is build an GW3UEP TX but drive it with reduced power (the odd milliWatt) via divider chain from one of the rigs. That way you get the frequency stability and VFO agility (not that it is really needed) plus side tone etc from the rig by using split working. You will have to recalibrate your mind to the actual TX frequency depending upon the division quotient i.e /2 , /4 , /n etc. On RX read out would be direct of course.. Otherwise use a DDS as the TX exciter. (I use xtals).
http://www.gw3uep.ukfsn.org/100W_QTX/100WTX/PA_cmos.gif
http://www.gw3uep.ukfsn.org/100W_QTX/QuickView/Quick%20View%20100W%20QTX.htm
There are also similar simple TX designs for 136.
This suggestion does not give you linear operation and is not suitable for sound card modulation applications such as WSPR (just as well IMHO) it is only suitable for On / Off keying modes such as CW/ Very Slow CW QRSS/ Opera a form of CW/ NB direct shift RTTY/ Direct shift DFCW will work OK.
Before I am corrected WSPR is possible but only via some jiggery pokery using a four direct frequency shift pattern. Clever Johan SM6LKM has cracked it.
However some one on here may have done the modifications to the TS range but I have not heard about it myself.
Good luck
73 es GL Pete M0FMT IO91UX
--------------------------------------------
On Fri, 30/1/15, DK1IS <[email protected]> wrote:
Subject: LF: LF/MF TXing for Kenwood TS950SD and TS50
To: [email protected]
Date: Friday, 30 January, 2015, 16:28
Hello Group,
are there any experiences with extendig the TX range of
these Kenwood
radios down to MF and LF? Long time ago I´ve already done
the usual
extensions for general TX coverage within 1.7 to 30 MHz by
cutting some
diodes but up to now I can´t find any modifications for
MF/LF. With the
TS950SD it possibly could be restricted to the driver
output. Any ideas?
Thanks and 73,
Tom, DK1IS
www.qrz.com/db/dk1is
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