[Elecraft] K3-100 #1433 Will not transmit on 40 meters LSB.

[Jack Regan]

Gary,

Thanks for the response. Although setting CMP  to 20 and FL.H  gets the
correct number of bars for CMP and ALC on the display I still have no RF
output on 40 (7.200) LSB. When I press the PTT button on the mic the red led
for TX comes on and one bar on the RF display shows but when I speak or tap
the mic there is no change in the RF display. On 20 USB, the RF display
shows full output!

BTW, I entered the SKCC WES the day I finished the build and cw worked
flawlessly on 40 with the same ant in both bypass and atu mode. The ant is
cut for perfect swr on the cw end and show 3 bars in bypass mode and 2 bars
in ATU mode. Well under 2.0 swr.

The Filter Utility show the 2.8 set for LSB TX. 
When I go to CONFIG:FLTx FL3 is see cw in cw mode and LSB if I hit MODE.

Any more suggestions?

Jack

________________________________________
From: Gary Surrency [mailto:support at elecraft.com] 

Hi Jack,

A Kenwood MC43 mic needs no bias. I have one here and it works fine with the
K3.

Try advancing the MIC and CMP levels, and set MIC SEL to FPH for a little
more sensitivity (press #1).

Be sure the rig works OK in TUNE and CW before troubleshooting problems in
SSB.

73, Gary AB7MY
=========
support at elecraft.com
Elecraft Technical Support 

-------- Original Message -------- 
Subject: 
RE: [Elecraft] K3-100 #1433 Will not transmit on 40 meters LSB.
Date: 
Tue, 12 Aug 2008 09:54:55 -0700
From: 
Jack Regan <ae6gc at sbcglobal.net>

Bill, Ian

Thanks for the replies. Re: BIAS. I saw the word DYNAMIC on the mic (a
Kenwood MC-43S) and a pin out that showed 8V and jumped to the conclusion
that bias was needed.

That was seemingly confirmed when I was able to get the mic to work only
when I had BIAS on. There could be some confusion because I was dealing with
filter tx settings at the same time.

I now have FP.L and no bias. 20 meters USB works. I get RF out on the
display.

On 40 meters LSB I can still hear the mic on the radio but still get no rf
out.

The K3 Utility under Configuration shows a 2.8 filter TX SSB
When I go into CONFIG: FLTX SB FL3 LSB shows.

What else could be going on!

 

-----Original Message-----
From: Bill NY9H [mailto:ny9h at arrl.net] 
Sent: Tuesday, August 12, 2008 8:59 AM
To: Jack Regan
Subject: Re: [Elecraft] K3-100 #1433 Will not transmit on 40 meters LSB.

the bias should be off for a dynamic element.....

could be the bias being on is messing up stuff.....

Only an electret requires that bias voltage.

bill

At 11:52 PM 8/11/2008, you wrote:
>The rig works well on all the USB bands. Mic is a Kenwood 600 ohm dynamic
>mic.  Bias is on.  Front panel Input.
>
>
>
>On 7.180 (for example) PTT puts rig in transmit mode. Red TX led comes on.
>Voice or tapping the mic is heard from the K3 internal speaker.
>
>NOTHING MOVES ON THE RF DISPLAY. On 20 USB the display show the appropriate
>peak power output.
>
>
>
>I have looked at the manual but cannot find what I need in the wealth of
>options.
>
>
>
>Hope you guys can help!
>
>
>
>I do have the K3 Utility up and running. I went over the crystal
>configuration settings that I have with Scott at Elecraft to confirm my set
>up.
>
>At the time my USB transmissions were working so when Scott confirmed my
>choices I felt good about having deciphered the manual!  Scott also
>confirmed my mic set up.
>
>
>
>Was I ever surprised when I could not transmit on 40 LSB this afternoon!
>
>
>
>Thanks in advance,
>
>
>
>Jack, AE6GC, KX1 #1403, K3-100 Kit #1433.
>
>
>
>
>
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