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Re: LF: Re: Re: MF/160

from [Rik Strobbe] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: Re: LF: Re: Re: MF/160
From: Rik Strobbe <[email protected]>
Date: Tue, 24 Oct 2017 20:34:07 +0000
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Thread-topic: LF: Re: Re: MF/160

Hello Ian,


I got mine for free from a friend. It is a "industry style" design, pretty foolproof.

Indeed they are not produced anymore, but maybe they show up on ebay once in a while.

If you can get one at a reasonable price I would recommend to buy it.


73, Rik  ON7YD - OR7T


Van: [email protected] <[email protected]> namens [email protected] <[email protected]>
Verzonden: dinsdag 24 oktober 2017 16:13
Aan: [email protected]
Onderwerp: Re: LF: Re: Re: MF/160
 
Hi Rik
 
Thanks for that info, I tried to find a price for the unit but seems they no longer make them? Any idea what the equivalent maybe, Found a 52 V –30 A unit they make. Looks like lots of $’s  Hi.
 
Good signals on FT8 by the way. Still looking to get an FT8 QSO with Spiros.
 
73
 
Ian G4GIR
 
Sent: Tuesday, October 24, 2017 2:30 PM
Subject: LF: Re: Re: MF/160
 

Hello Ian, Andy, all,

 

I am using a Delta 1200S48 SMPSU (see https://www.prbx.com/wp-content/uploads/pimfiles/560/dts_1200s.pdf). I cannot detect any noise coming from this PSU on 137 or 475 kHz.

Output voltage can be regulated from 22 to 63V, very handy to set the TX output power.

With the current TX I can adjust the output power to any value between 10 and 300 W (PSU voltage in combination with a tap on the TX output transformer).

The only drawback is relative slow regulation, causing a significant voltage dip (abt. 20%) during some milliseconds at "key down". Not an issue on WSPR, JT9, FT8, QRSS etc... but I am not so happy with this for CW.

 

7​3, Rik  ON7YD - OR7T

 

Van: [email protected] <[email protected]> namens [email protected] <[email protected]>
Verzonden: dinsdag 24 oktober 2017 14:59
Aan: [email protected]
Onderwerp: LF: Re: MF/160
 
Hi Andy
 
I, like you use SMPSU’s 50V approx 10A . Mine are Chinese albeit shipped in the UK! was a bit dirty but all it needed was a mains input filter. Now very quiet. Wonder what type/model/EBay number you are using. I went for a pair of 28V 10A units so I could use 56 or 28 V on the 472 KHz TX.
 
Thanks
73 Ian G4GIR
 
 
Whic
 
Sent: Monday, October 23, 2017 8:20 PM
Subject: Re: Re: Re: LF: MF/160
 
I don't knoe why radio amateurs are so anti SMPSU on principle.   
Unfiltered nasty Chinese ones may be bad, but anything can be cleaned up. 
 
My 50 Volt 20A one I use with teh 475kHz PA is absolutely quiet, not a whisper detectable on any frequency from LF to HF
 
'jnt
 
 
On 23 October 2017 at 20:07, dhchurch <[email protected]> wrote:
Hello Andy
 
The idea of using any SMPS in, or near, the shack is somewhat abhorrent. It is possible to introduce a series circuit in a linear PSU which is not exactly a regulator but has a hum cancellation circuit, something that used to appear in an ancient National Semiconductor publication. I'd love to try it but just haven't left any room in my PSUs, they're stuffed full, including a cooling fan. A couple of 100Hz side bands are at least predictable, my PA has,  but there is one regular transmission on LF which has all manner of spurii making reception here somewhat variable.
 
I think Dave, GW8GLO, has a system which promptly knocks off his transmitter SMPS when going into Rx mode, maybe this is the way to go.
 
73, Hugh, M0DSZ
 
----- Receiving the following content -----
From: Andy Talbot
Receiver: rsgb_lf_group
Time: 2017-10-23, 10:12:17
Subject: Re: Re: LF: MF/160
 
Its a difficult call - I have a similar problem with my 700 Watt 137kHz Tx.　 　30dB hum sidebands corresponds to 3% ripple, which in the main scheme of things is not that much.　 　It would need an enormous reservoir capacitor to make a serious reduction.　　
 
Either that or design the Tx to run from 50V and use a SMPSU instead of raw rectified AC
 
Andy　 G4JNT
 
On 23 October 2017 at 10:03, dhchurch <[email protected]> wrote:
Mal, I think a little attention should be paid to, perhaps, your power supply.　The 100Hz sidebands, as I recall from earlier this week, should be much lower in level. Seen on Spectrum Lab　at one stage, they were less than -30dB in comparative level.　
　
73, Hugh, M0DSZ
　
----- Receiving the following content -----
From: Andy Talbot
Receiver: rsgb_lf_group
Time: 2017-10-22, 22:44:59
Subject: Re: LF: MF/160
 
You're so strong, Mal,　 I'm getting decodes on your hum sidebands
 
21:36　　G3KEV　　0.475804　　-27　　0　　IO94sh　　5　　G4JNT　　IO90iv　　384　　189　　2017-10-22 21:36　　G3KEV　　0.475704　　+3　　0　　IO94sh　　5　　G4JNT　　IO90iv　　384　　189　　2017-10-22 21:36　　G3KEV　　0.475604　　-29　　0　　IO94sh　　5　　G4JNT　　IO90iv　　384　　189　　2017-10-22 1
 
Andy　 　G4JNT
 
On 22 October 2017 at 19:25, mal hamilton <[email protected]> wrote:

NICE CONDX 160M THIS EVENING VK7DIK 　REPORTING G3KEV WSPR MODE

LOOKING GOOD FOR MF/630 M ALSO

TNX REPORT DE MAL/G3KEV

　

　

　

　

　

　

　

　

　

　

　

　

　

　

Sent from Mail for Windows 10

　

 
 
 
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