[MRCA] Harris RF 350K

Sun Dec 31 13:42:36 EST 2017

Once you do an initial relay contact cleaning then do the relay mod and run the 
radio through several passes of the self test which exercises them then they 
should be fine.  It's a pretty easy mod.  I found it and attached.

As for the main connector, I wired one with both DC and AC cords.  I set the 
power supply for 24 volt input as I have over 1000 AH of 24 volt batteries for 
backup, and if I'm going to use 12 volts why bother with the power supply 
anyway? Just connect direct to the RT with the same connector.  Btw, the power 
switch still turns the RT on and off if you don't use the power supply, except 
that the PA is always powered (it then just controls the DC-DC supply inside).

Peter
kb2vtl

On 12/31/2017 1:32 PM, Ray Fantini wrote:
>
> Being a cheap and not having to spend any money want to do this as cheap as 
> possible! What I have done before and may do again is remove the 20-8S and 
> replace it with a similar connector that I have.  Have a 20-8 regular without 
> the two big pins for the DC  and may stuff that in there, or maybe fabricate a 
> blank plate with a IEEE power connector being I have a limitless supply of 
> computer power cords.
>
> Found by doing this and keeping the original connector eventually I will come 
> across the proper connector and at that point change it back. In the past 
> several years have spent much time dealing with connectors and cables.
>
> Was a point in my life where I thought what the hell and would just remove the 
> connector and install a blank plate or something but the older you get the 
> more you get into this weird mind set of wanting to try to do something 
> right or something like that and this is where you get connector and cable 
> obsessed.
>
> One of the more pointless projects around the shop for the last couple years 
> has been my Rolm 1602 computer and would hate to think about it but have spent 
> hundreds of dollars buying connectors and building cables for that.
>
>
> If your interested in seeing what it looks like there is a YouTube video at:
>
>
> https://www.youtube.com/watch?v=kJdTduulvAQ
>
>
> So tomorrow is a new year! Lets see what manor of equally useless projects I 
> can get involved with. Will be hard to beat the FR-38 project, the RF-350K 
> must have some use but beyond getting it up and running but have no plans for 
> it and may try selling it at Frostfest so have to try to keep it original 
> being that may have some bearing on its value so maybe the proper connector 
> would be in order along with a set of replacement relays, or maybe this can 
> replace my older Harris RT-1230/URC-94 as my Ham transceiver being its a bit 
> newer and weighs more.
>
> The big thing is that at this time of year there is not much money in the 
> discretionary account. And that brings us back to not wanting to spend money.
>
> Happy New years all.
>
>
> Ray Fantini KA3EKH
>
>
>
> --------------------------------------------------------------------------------
> *From:* DSP3 <jeepp at comcast.net>
> *Sent:* Sunday, December 31, 2017 8:11 AM
> *To:* Ray Fantini
> *Subject:* Re: [MRCA] Harris RF 350K
>
> Ray, At my peril for perhaps stating the obvious that you've already done, how 
> about Bill Perry?
>
> Jeep - K3HVG
>
>
> On 12/30/2017 9:05 PM, Ray Fantini wrote:
>>
>> One of the projects around the holiday was a Harris RF 350K transceiver. 
>> After replacement of a half dozen shorted bypass capacitors on the + and – 15 
>> volt bus and repairs to the reset “auto start “on the controller have the 
>> mess working. As typical for that family of radios the relays on the filter 
>> board are shaky.
>>
>> Separated the power supply from the radio for working on this monster on the 
>> bench and have been using the bench 12 volt power supply but decided now that 
>> I want to put the two parts together and use the heavy  power supply that 
>> comes with the radio.
>>
>> The issue is the power supply takes a weird connector. It’s a MS3106A 20-8S, 
>> the 8S is because it has two huge sockets along with four small pins for the 
>> AC and ground. The same plug is on the pigtail from the power supply to the 
>> radio and although I have never seen it done may just ditch the huge, heavy 
>> over built DC power supply and steel that connector to use the radio from 12 
>> volts only.
>>
>> Looking at the amount of work to get this radio up and running and the 
>> remaining issues with the filter board starting to think this family of 
>> radios were hanger queens and perhaps that’s why so have been dumped by the 
>> government although they somehow appear to sell for big money. This radio was 
>> given to me by someone who sold it and then had it returned and never wanted 
>> to see it again after that happened so that’s how I got it but the power 
>> connector may be a big issue being that looking on E Bay I don’t see one.
>>
>> Ray F/KA3EKH
>>
>>
>>
>>
>>
>
>
>
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