Kenwood TS990

Welcome to our Kenwood TS990 Resources page

After many years of running the Kenwood TS870 – it was time for an shack upgrade.
The 870 has been a superb workhorse and coupled with the W2IHY 8-Band EQ, W2IHY EQ-Plus and Heil Goldline GM5 (now discontinued) this line-up has served me extremely well for over 15 years. The TS870 is known for its great audio and coupled with the W2IHY gear it really did sound pretty good. So in preparation for the new addition to the shack (Summer 2018), I’m collating a resources pages (similar to the Command Technologies HF2500 Amp) pages that we host.

Kenwood TS990 Transceiver

Given that the 870 will go, I’ve decided on a full shack change around so the W2IHY 8-Band, W2IHY EQ-Plus and Heil Goldline GM5 will all be surplus to requirements. Not that there’s anything wrong with any of it – all the kit works fine – it’s just time for a change. **Check back here in the late Spring of 2018 as all three will be up for sale **

So what’s going to be new here in the Vortex shack

Kenwood TS990

That’s the first addition. Here’s a run-down from Kenwood UK and a PDF download of the RADCOM review from June 2013 by Peter Hart G3SJX. In addition – here’s the February 2014 ARRL QST Review by Rick Lindquist WW1ME PDF Download.

Symetrix 528E Audio Processor

The ‘Symetrix 528E Audio Processor‘ is not new but over the years has developed a following in the ham community as being one of the best audio mike pre-amps and compressors around. Originally manufactured in the early 1990’s by Symetrix of Washington State (USA), the 528E became extremely popular in the early days of ESSB. Although now discontinued, it is still in high demand. Probably only bettered by the superb ‘Avalon VT-737SP‘ Mic tube Pre-amp.

Klark Teknik DN-370 Professional Analogue EQ

Designed and manufactured in the UK, the Klark Teknik DN370 is a modern 30 band dual-channel EQ which is a current 2018 production model. Klark Teknik designs and develop professional signal processing and audio equipment. Located in Kidderminster, Worcestershire, UK, the company was founded in 1974 by brothers Terence and Phillip Clarke. It developed a number of new types of equipment in the audio field, winning a Queen’s Awards for Enterprise in 1986 so we are proud to run some ‘British’ hi-end audio processing gear here at Vortex.

Reviews of the DN370 say this is a superbly clean unit being extremely transparent.
The Kenwood TS990 has an in-built 18-band EQ and whilst this covers the central part of most audio frequencies, it cannot handle frequencies below 100hz and above 5.1khz. Given that the microphone response of the TLM103 is in the range of
20hz-20khz, the DN340 will enhance areas where the generic 990’s EQ can’t reach.

To quote from a current owner..
“This professional hi-end EQ is a real beauty. Great controls with 45mm oil-damped sliders and fully balanced inputs and outputs it just oozes quality. It’s certainly not one of your run-of-the-mill graphic EQ’s.
First live test last night and it had the best musical sound. It’s very, very clean and superbly transparent. Variable Notch filters are VERY powerful tools, >18dB attenuation, Q=32. A couple of well located notch filters, one at 90Hz augmented by further attenuation on the relevant fader gave me -30dB (at very high Q) there for some nasty in-room resonances, and -18dB at 250Hz (notch filter alone) cleared up some endemic muddiness. The Proportional-Q (versus prior Symmetrical-Q model) seems to have reduced / eliminated “ripple” effects. The result is remarkably increased clarity and a unit that just shines above everything else.”

Neumann TLM 103 Microphone

The Neumann TLM 103 is a large diaphragm condenser mic used in many professional recoding studios. Often regarded as a studio ‘Workhorse’ and manufactured by Georg Neumann (Berlin), Germany. The Neumann name is one of the most famous in the broadcast industry and mics such as the famous Neumann U87 need no introduction.

Quote from a professional user

“The TLM 103 is nothing short of amazing and for the price, such an affordable way to get into the pro league. Once you have had the Neumann experience you will understand why these microphones are such an industry standard and sought after by many. From the moment that you open the elegant wooden Neumann box to the moment you put the TLM 103 to bed after a session, you’ll notice that you have been smiling from ear to ear!”

Link here for a selection of user and owner comments on the TLM103

Kenwood TS990 Resources and Files


User Manual – Download Here (63Mb)
Service Manual Part 1 – Download Here (8Mb)
Service Manual Part 2 – Download Here (10Mb)
In Depth Manual – Download Here (16mb)
Amplifier Keying – Wiring Data – Download Here (0.1Mb)
Kenwood Network Command System (KNS) – Download Here (1Mb)
Kenwood USB Audio Manual – Download Here (0.4Mb)
Kenwood PC Control Command Manual – Download Here (0.8Mb)
Virtual Comm Port Driver Setup – Download Here (0.8Mb)
TS 990 Brochure PDF – Download Here (2Mb)


MARS Mod and Expanded TX (Tnx PA2DB) – Download Here (0.1Mb)
Add an IF Output port to your TS990 (quite involved) – Download Here (3.3Mb)
Retransmit Recorded Receive Audio (Tnx WD8DAS) – Download Here (0.1Mb)
Transmit Output Power (Tnx WB4JWM) – Download Here (0.1Mb)
Noise Blanker 2 (NB2) revised functionality – Download Here (0.1Mb)


Firmware revisions – Download Here (4Mb)
The latest firmware (V1.13) – Download Here (13Mb)

Other Resources

Add a second SP 990 Speaker to your line-up (Tnx ZP5BVK) – Download Here (0.1Mb)
Upgrade the speaker driver unit in the SP 990 – Link Here to Phonema Speakers
TX Audio Setup by AB4BJ – Download Here (0.2Mb)

More links and resources will be added shortly