Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: IC706 & LF/MF transverter

To: [email protected]
Subject: Re: LF: IC706 & LF/MF transverter
From: Brenda Hayes <[email protected]>
Date: Mon, 05 Nov 2007 14:12:38 +1300
In-reply-to: <017a01c81f14$1bbeb870$6d3e6a58@wgt01>
References: <017a01c81f14$1bbeb870$6d3e6a58@wgt01>
Reply-to: [email protected]
Sender: [email protected]

Hello Gary and LF Group,

There has been mention in the past on the LF group of LF & MF
operators using Icom IC706 as a transverter driver due to its
frequency stability, how many of you out there use the IC706
this way & is the receive capability good on 136 & 500 KHz ??

I used a IC706 MK2 as a LF signal source for several years [CW only]. The transmitter was operated at 18 odd MHz. with minimum power into a dummy load. This was followed by a couple of 7490's to divide by 100 [final frequency was 181.4 kHz.]. Note that there was no transverting, just simple division.

Keying the 706 caused the fan to start and stop with a very minor observable frequency shift on the Argo display. With hindsight, I would leave the transmitter run all the time and key a later stage. I should also mention that I did not have a TCXO installed as they were unavailable by 2000.

Overall, I was happy with the end result for transmitting. Receiving was a different story. The receiver was both deaf and full of birdies in the LF area. Some pre-amplification seems to have worked well for other 706 models but I would have only been amplifying the birdies. For receiving I used a basic converter ahead of the 706 [18 Mhz xtal osc.] and tuned on the 18 Mhz. band. This worked well.

I have since "opened " up the 706 for general HF transmitting. If I decide to fire up in the 136 kHz area, then I would divide down from 13.6 Mhz.

I cannot comment on 500 kHz. receiving performance but a dummy load transmitting test showed about 25 Watts output with a poor waveform which, no doubt, could be readily filtered.

73,  Kevin  [ZL4MD].








<Prev in Thread] Current Thread [Next in Thread>