Return-Path: Received: (qmail 856 invoked from network); 30 Aug 2001 17:09:07 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 30 Aug 2001 17:09:07 -0000 Received: (qmail 10147 invoked from network); 30 Aug 2001 17:07:16 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 30 Aug 2001 17:07:16 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15cVBp-0005Yx-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 30 Aug 2001 18:01:13 +0100 Received: from imo-m06.mx.aol.com ([64.12.136.161]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15cVBo-0005Xc-00 for rsgb_lf_group@blacksheep.org; Thu, 30 Aug 2001 18:01:12 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from DL4YHF@aol.com by imo-m06.mx.aol.com (mail_out_v31_r1.4.) id l.a6.18f9f60b (4261) for ; Thu, 30 Aug 2001 12:59:58 -0400 (EDT) From: DL4YHF@aol.com Message-ID: Date: Thu, 30 Aug 2001 12:59:58 EDT Subject: LF: Re^n: Receiver To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Mailer: AOL 6.0 for Windows DE sub 10506 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit Hello,

I once had the chance to compare an old IC735, an IC706 and a TS850 running
side-by-side connected to a tuned LF-antenna (150m long wire).

Results:
- TS850 with 500Hz and 270 Hz filter:   
  Could hear the grass grow   and   OH1TN call cq on 136kHz.
  A fine rig, as already expressed by others (and in the LF handbook).
  Considering the price I once paid for it, and for what it can be found
  nowadays on the second-hand market, I would almost buy a second
  one as a spare unit !

- IC735:  quite deaf, some IM products audible which were not there
  on the TS850. But still a nice rig on 160m and HF.

- IC706 ( the 'old' one, no MK2, with 270 Hz filter):
  Very deaf on 136kHz, no matter if the preamp is on or off.
  Turning the VFO knob OR THE VOLUME CONTROL results
  in a hissing sound, which stops after the motion.
  Looks like the rig picks up some noise from its own serial interface
  between the front panel and the microcontroller !
  Hopefully the IC706 MK2 ( & -G) are better at 136kHz.
  At 77kHz, I cannot even hear the DCF time signal transmitter near
  Frankfurt...

Some years ago, I compared the TS570 and the TS850 on HF for CW.
There were severe blocking effects in the TS570 in a heavy crowded CW
segment, because there is not enough selectivity in the early stages
in the IF amplifier chain. The S-meter went up to S-9, but no signal
could be heard because the DSP decided it was outside the passband.
And, with modestly narrow CW filter settings the audio from the TS570
sounded like a block flute, which is not very pleasant. Maybe there was
something wrong with the DSP. We never did further investigations because the
owner of the TS570 immediately traded it for a TS850...

73,
 Wolf  DL4YHF.