[OZAPRS] FM828

[Ray Wells]

Something else to consider re the FM828, the tx is continuously rated 
for full power to 60°C (about the temperature of your hot water service 
at home), a serious consideration for a busy digi or voice repeater.

The FM814 (VHF) and FM815 (UHF) base stations are continuously rated. 
The rx and the exciter in the 814/815 are from the FM828 mobile, 
testimony to the rx performance of the 828.

The Philips FM92 is not continuously rated and very quickly starts to 
sag. The FM91, with the external PA housing is continuously rated.

The Tait T500 series are a good radio but the tx is not continuously 
rated. The T700 is, from memory, but the T2020 series is not.

I've not seen an AR rig for 2m that's continuously rated.

Don't underestimate the tx duty cycle of your digi installation.

A bit of trivia.
When AWA released their BST50 base station back in the 70's, the rx was 
all solid state, using germanium front-end transistors - the AFZ12, for 
those old enough to remember those early VHF devices. Those receivers 
were so much of a disaster that the BST50B was released, with a valve 
front-end. Even with a crystal filter ahead of the rx, the all solid 
state unit could not cope at mildly busy sites. The STC 152 base fared 
no better. How come my employer always bought junk base stations - too 
many free lunches? I finally found heaven when we bought FM814's. We 
already had about 40 FM815's in service in our Sydney sites. Sydney was 
UHF with multiple sites, multiple channels and, voting, Gosford/Wyong 
was VHF with three channels and three sites, originally half-duplex and 
later talk-through repeater.

Ray vk2tv

On 25/02/11 00:28, Damien Gardner Jnr wrote:
> Speaking of FM800's... I have a photocopied FM8xx manual (fully filled big A4 binder) sitting in the bin in the house we just shifted out of.. - I probably should have asked if anyone wanted it? (Happy to post..)  I swapped my FM800 for a tait somethingorother many years ago, so haven't had any use for it since ;)
>
> Cheers,
>
> DG
>
> On 24/02/2011, at 8:40 AM, Howard Small wrote:
>
>> The Tablelands Amateur Radio Club has agreed to put up a digipeater to link to ours in Cairns (VK4RIK-3) and is offering an FM828 for the job. One of our members will supply a TNC but before they get crystals for the FM828 we need to check if there are any issues.
>>
>> Has anyone used an FM828 for a digi? If so, can you please give me details on the interface to the TNC and any other info that may be useful?
>>
>> Thanks,
>>
>> Howard
>> VK4BS
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