If John tried my step three, with dummy load at low power, it is rather doubtful that ferrites are going to help here. 

Before diddling with the headset, try backing off the RF gain on the receiver. I suspect the "thump" is due to AGC action.
Or turn off the AGC if your rig allows it and use the RF gain for comfortablelistening.
Regards
Dick

The OP should do something in the way of ISOLATION of the reported problem or all answers are mere conjecture. 

**Substitute another set of headphones of any kind, even cheap earbuds, just to see if the problem persists.**

**Try the several CW modes available to you, such as Full Breakin, Semi QSK, and manual to see if the problem persists in all.**

**Try it with the rig connected only to a Dummy Load with short jumper.  Vary the power level from low to high to see if that affects the reported problem as well.**

**Try it into the antenna again at varying RF power levels, see if it only happens when sending full power but perhaps does not happen at say the 5 or 10 W level, indicating an "RF in the shack" situation.


73

Hi John,

Hi-Fi headphones are not ideal for communication purposes, because they have an extended low frequency response.

This can be distracting when listening to weak signals or with static crashes in the background.

If you radio has a receiver audio frequency equaliser. Try rolling off the gain at frequencies below 250Hz.

A simple hardware modification is to put a low value capacitor in series with the audio feed to the headphones. Something like 0.1uF is a good starting point to try.

Rolling off the high frequency end can help make listening less fatiguing too. I actually find that cheap headsets that have a limited frequency response sometimes sound better for SSB & CW QSO's.

Regards,

Martin - G8JNJ

www.g8jnj.webs.com

Build a high pass filter for the headset connection that will prevent frequencies below about 300Hz from reaching the headset. Alternately you could purchase a communications quality headset that is designed to pass 300Hz to 3000Hz.

When is an Electraft completed? When you run out of money.
When is an Icom/Yaesu/Kenwood completed? The second you open the box. All bug fixes, upgrades, etc will be available when you purchase the next model.

Looks to me like you join their academy (next one is Jab-Feb), learn the code, get your speed up to 25wpm, then get sponsored by 4 other members so you can be part of the club. 

Eric

Wayne, I used W1AW's code practice sessions to help me with the code starting out. I still use the practice sessions to gain speed, since I was QRT for almost 10 years. Tough to beat the price, the code is sent perfectly and in plain text from the ARRL's station. The practice sessions do include puncuation marks and numbers which are always good to know, IMO. Here is the W1AW practice schedule for the summer. Good Luck in learning the code. 

              W1AW SUMMER SCHEDULE: APRIL - OCTOBER
                        (all times in UTC)


 Voice Bulletins:        Daily: 0130, 0430;

 Teleprinter Bulletins:  Daily: 0100, 0400, 2200;  MTWThF: 1500;

 CW Bulletins:           Daily: 0000, 0300, 2100;  MTWThF: 1400;

 Slow Code Practice:                 MWF: 0200, 1300, 2300;
 (5, 7.5, 10, 13, and 15 wpm)        TThSSn: 2000; Sn: 0200;

 Fast Code Practice:                 MWF: 2000; TTh: 0200, 1300;
 (10, 13, 15, 20, 25, and 30 wpm)    TThSSn: 2300; S: 0200;
                                                          - more -
 FREQUENCIES:   Voice  - 1.89, 3.99, 7.29, 14.29, 21.39,
                         28.59, 50.19, 147.555 MHz.

           Teleprinter - 3.625, 7.095, 14.095, 21.095,
                         28.095, 147.555 MHz.

                    CW - 1.818, 3.58, 7.08, 14.07, 21.08,
                         28.08, 50.08, 147.555 MHz.

 The Monday, Wednesday, and Friday 1300 - 2100 UTC transmissions
 are beamed to Europe on 14, 21, and 28 MHz;  on Wednesday at
 2200 UTC they are beamed south.

 The Friday bulletins are replaced with a special DX bulletin.

 The Tuesday and Saturday 2230 UTC teleprinter bulletins include
 the Keplerian elements for all amateur satellites.       - more -

 Teleprinter transmissions are 45.45 baud Baudot, 110 baud ASCII,
 and 100 baud AMTOR, FEC mode.

 The CW bulletins are sent at 18 wpm.