[ARC5] On the air

[AKLDGUY .]

I'm sorry guys, Google photos has become a most frustrating thing.

A while back, it was simply necessary to check each image and post each
one's link in order to share them.
Now, it wants to let only a group of my contacts see them.
Hopeless user interface.
Doesn't confirm whether they're being shared or not. The sharer (me)
automatically sees them, so gets no feedback that they're not visible to
others, and has no way to check whether they are, other than asking for
comments.

I've tried setting up an album but the user interface is so bad it doesn't
confirm whether I'm successful.

Try this:

https://photos.google.com/share/AF1QipPCT1kRwrCFo4fEcwuz94SktbvWHQE6iCp0b_03VPaWFOn_w1lvV-LHsTa--iQt_Q?key=d0gwZzQxaV9jV0FSMDlXXzRtcTVGQ3F4QjBnYk5R

73 de Neil ZL1ANM





On Sun, May 21, 2017 at 5:51 PM, AKLDGUY . <neilb0627 at gmail.com> wrote:

> Here is a description with photos of my AN/ARC-5 setup which I completed a
> few days ago and operated for the first time on the New Zealand AM net on
> Friday night, 19 May 2017. Operation was not very successful, but I was
> heard. My antenna is very poor and I struggled to get into the local SDR
> receiver, my primary aim.
>
> I've owned the T-19 ARC-5 for a decade and a half, but never had the
> enthusiasm for procuring HV transformers for a power supply. A few months
> ago, I obtained a Thordarson mod transformer, and then a dynamotor. The
> latter made the power supply so simple.
>
> This view shows the setup exactly as used on the Friday night net. Power
> supply at right is 0-16 VDC, 25 A, set to 13 V and connected to the 12 V
> gel cell which provides ooomph for starting the 12 V, 14 A dynamotor. The
> transmitter and MFJ tuner are sitting on a rack that normally mounts my
> BC-AO-230 transmitter, and the lower shelf consists of the BC-230's power
> supply and is not relevant here.
>
> https://photos.google.com/photo/AF1QipOouvSiAsF0etl5eZE1tLY9by
> wxdc1AZgmwjUhf
>
> https://photos.google.com/photo/AF1QipO9tKJVQgK28nV-
> 7VkwbLE-3Y8MaO1oAxdZmQd2
>
> The following view shows, at right, the heater/selector-relay supply (25.6
> VDC regulated).
>
> In the middle chassis at rear is the relay that switches the 13 VDC to the
> dynamotor, and the heater transformer for the 2E26's (heaters wired for
> 12.6 V with junction grounded). At front is the transformer that supplies
> the relays and the speech amp. On this front chassis is room for a 200 V
> supply for my ARA receiver, which may be the next project.
>
>  At left is the speech amp chassis (front) and the 2E26 modulator tube
> pair and Thordarson transformer (rear). The 2E26 screens are regulated at
> 150 VDC by the 0A2 on the rear of the front chassis. The 3 dry cell
> batteries provide 25 V bias to the 2E26's, adjustable by a pot in the left
> black box. The right black box consists of meter sockets for PA and 2E26
> plate current.
>
> https://photos.google.com/photo/AF1QipPJ2aMdDeyN77Ew9xSVxWGv6C
> dkMxzHi_XHXgLN
>
> The following photo shows the rear of the T-19. The black boxes contain
> dropping resistors for the VFO (right, orange wire) and 1625 screens (left,
> yellow wire). The resistors are made up of 4K7, 5W units in series (the
> largest value of 5W readily available).
>
> https://photos.google.com/photo/AF1QipPvtVCIDNtPPzz9EJ4yukETGy
> nJlJzhKZrSbUd1
>
> The last view is of the underside of the speech amp & modulator, by far
> the most complex of the 3 twin-chassis units. Speech amp is 3 X MPF-102,
> driving an LM-380N on the small perf board. This drives the 8 ohm tap of a
> standard multitapped line transformer, whose "secondary" is 5,000 ohms.
> Because there is no centre tap on the 5,000 ohm winding, an artificial one
> was created by splitting the load resistance into two 2K7 resistors with
> their junction decoupled with a 47uF, 35 V ESR electrolytic capacitor. The
> 2E26 grids are not to be driven into grid current in Class AB1, so they
> must not be driven greater than 25 V (50 V grid-to-grid). This setup is
> easily capable of developing 80 or 90 volts peak, measured from grid to
> grid.
>
> No attempt was made to make the speech amp compact; I had plenty of space
> and my eyesight is not so good for fiddly stuff any more, hence the half
> watt resistors.
>
> https://photos.google.com/photo/AF1QipOlKXE3sldmC0Idq5egpoFXpq
> vVtU3icxGGJkDR
>
> Hope someone picks up an idea or two.
> 73 de Neil ZL1ANM
>
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